You searched for subject:(PHM).
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Oregon State University
1.
Kramer, Scott (Scott Carl).
Extension of early stage failure analysis tools to Prognostics Health Management design.
Degree: MS, Mechanical Engineering, 2009, Oregon State University
URL: http://hdl.handle.net/1957/11871 
► Modern complex mechanical systems have evolved to a point of incredible complexity. Many now operate with significant assistance from automated response functions, and some operate…
(more)
▼ Modern complex mechanical systems have evolved to a point of incredible complexity. Many now operate with significant assistance from automated response functions, and some operate without human operators at all. These increasingly complex systems have also become more expensive and more ambitions in mission, bringing about higher risk to both money and life. In
response to these risks, Prognostics and Health Management (
PHM) systems are developed to detect, manage, notify, mitigate, and respond to the potential failures in these high risk complex systems. The responsibilities carried by
PHM systems make them as integral to the successful operation of a complex machine as any other major system. While methods have been developed and are in use to consider risk and reliability in the early stage of complex system design, explicit consideration of
PHM capability and architecture are often left for later stages in the design process. In this work, several risk and reliability based design techniques are discussed with consideration of
PHM development. In particular, the Function Failure Identification Propagation
(FFIP) framework provides a systematic process to identify potential failure points and the resulting functional losses from a model based architecture. Research into
PHM and embedded system co-design indicates that FFIP is a good starting point for early stage
PHM architecture development. In this body, FFIP is first augmented to more completely capture the data needed for preliminary
PHM architecture and to begin to address
PHM capability in early stage complex system design. Second, an embedded systems design process centered around StateCharts is developed for specific application to the FFIP process in order to facilitate
PHM system design during early stage complex system design.
Advisors/Committee Members: Tumer, Irem (advisor), Tumer, Irem (committee member).
Subjects/Keywords: PHM; System failures (Engineering)
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APA (6th Edition):
Kramer, S. (. C. (2009). Extension of early stage failure analysis tools to Prognostics Health Management design. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11871
Chicago Manual of Style (16th Edition):
Kramer, Scott (Scott Carl). “Extension of early stage failure analysis tools to Prognostics Health Management design.” 2009. Masters Thesis, Oregon State University. Accessed March 08, 2021.
http://hdl.handle.net/1957/11871.
MLA Handbook (7th Edition):
Kramer, Scott (Scott Carl). “Extension of early stage failure analysis tools to Prognostics Health Management design.” 2009. Web. 08 Mar 2021.
Vancouver:
Kramer S(C. Extension of early stage failure analysis tools to Prognostics Health Management design. [Internet] [Masters thesis]. Oregon State University; 2009. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/1957/11871.
Council of Science Editors:
Kramer S(C. Extension of early stage failure analysis tools to Prognostics Health Management design. [Masters Thesis]. Oregon State University; 2009. Available from: http://hdl.handle.net/1957/11871
University of Minnesota
2.
Ladd, Melanie Ann.
Purification, crystallization and structure determination
of an azurin variant.
Degree: MS, Chemistry, 2012, University of Minnesota
URL: http://purl.umn.edu/140046
► University of Minnesota M.S. thesis. August 2012. Major: Chemistry. Advisor: Dr. Steven M. Berry. 1 computer file (PDF): viii, 154 pages, appendix p. 109-154.
X-ray…
(more)
▼ University of Minnesota M.S. thesis. August 2012.
Major: Chemistry. Advisor: Dr. Steven M. Berry. 1 computer file
(PDF): viii, 154 pages, appendix p. 109-154.
X-ray diffraction is a method that allows the
three-dimensional structure of a molecule to be determined. To use
this technique to study a protein model, high-quality crystals were
grown. A biosynthetic approach was taken to model the mammalian
protein peptidylglycine α-hydroxylating monooxygenase (PHM), which
is a copper-binding protein that hydroxylates the α-carbon of a
glycine residue in the production of peptide hormones. In order to
understand the mechanism of this reaction, a model of the two
copper sites involved in hydroxylation was created using the
bacterial protein azurin as a scaffold (Az-PHM). To compare the
structural similarity of the model to the native PHM system, Az-PHM
crystals were grown for x-ray diffraction using various buffers,
salts, polyethylene glycol (PEG) and excess copper. Dozens of the
resulting crystals were diffracted, which had lower resolutions
(~2.5 Å) and higher mosaicities (0.8 - 1.2° on average). Crystal
dehydration and cryoprotection techniques were applied and
consistently yielded higher resolution and lower mosaicity
crystals. The crystal with the highest resolution and low mosaicity
was grown in Tris buffer, lithium nitrate, PEG-2000 and copper
chloride. Diffraction images for this crystal were collected on a
Rigaku RAPID II X-ray Diffractometer using a copper radiation
source with capillary optics and an R-AXIS image plate detector.
Data were indexed to yield a P212121 space group, which was then
followed by integration, scaling and averaging using CrystalClear
2.1 software. Phases were determined using the Molecular
Replacement method in the software CCP4. Finally, structural
refinement of the model and electron density map in Coot yielded a
1.3 Å structure with an Rfactor of 17.57% and an Rfree of
20.70%.
Advisors/Committee Members: Dr. Steven M. Berry.
Subjects/Keywords: Azurin; CCP4; Coot; CrystalClear; Crystallography; PHM
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APA (6th Edition):
Ladd, M. A. (2012). Purification, crystallization and structure determination
of an azurin variant. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/140046
Chicago Manual of Style (16th Edition):
Ladd, Melanie Ann. “Purification, crystallization and structure determination
of an azurin variant.” 2012. Masters Thesis, University of Minnesota. Accessed March 08, 2021.
http://purl.umn.edu/140046.
MLA Handbook (7th Edition):
Ladd, Melanie Ann. “Purification, crystallization and structure determination
of an azurin variant.” 2012. Web. 08 Mar 2021.
Vancouver:
Ladd MA. Purification, crystallization and structure determination
of an azurin variant. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Mar 08].
Available from: http://purl.umn.edu/140046.
Council of Science Editors:
Ladd MA. Purification, crystallization and structure determination
of an azurin variant. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/140046
University of Minnesota
3.
Ladd, Melanie Ann.
Purification, crystallization and structure determination of an azurin variant.
Degree: MS, Chemistry, 2012, University of Minnesota
URL: http://purl.umn.edu/140046
► X-ray diffraction is a method that allows the three-dimensional structure of a molecule to be determined. To use this technique to study a protein model,…
(more)
▼ X-ray diffraction is a method that allows the three-dimensional structure of a molecule to be determined. To use this technique to study a protein model, high-quality crystals were grown. A biosynthetic approach was taken to model the mammalian protein peptidylglycine α-hydroxylating monooxygenase (PHM), which is a copper-binding protein that hydroxylates the α-carbon of a glycine residue in the production of peptide hormones. In order to understand the mechanism of this reaction, a model of the two copper sites involved in hydroxylation was created using the bacterial protein azurin as a scaffold (Az-PHM). To compare the structural similarity of the model to the native PHM system, Az-PHM crystals were grown for x-ray diffraction using various buffers, salts, polyethylene glycol (PEG) and excess copper. Dozens of the resulting crystals were diffracted, which had lower resolutions (~2.5 Å) and higher mosaicities (0.8 - 1.2° on average). Crystal dehydration and cryoprotection techniques were applied and consistently yielded higher resolution and lower mosaicity crystals. The crystal with the highest resolution and low mosaicity was grown in Tris buffer, lithium nitrate, PEG-2000 and copper chloride. Diffraction images for this crystal were collected on a Rigaku RAPID II X-ray Diffractometer using a copper radiation source with capillary optics and an R-AXIS image plate detector. Data were indexed to yield a P212121 space group, which was then followed by integration, scaling and averaging using CrystalClear 2.1 software. Phases were determined using the Molecular Replacement method in the software CCP4. Finally, structural refinement of the model and electron density map in Coot yielded a 1.3 Å structure with an Rfactor of 17.57% and an Rfree of 20.70%.
Subjects/Keywords: Azurin; CCP4; Coot; CrystalClear; Crystallography; PHM
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APA (6th Edition):
Ladd, M. A. (2012). Purification, crystallization and structure determination of an azurin variant. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/140046
Chicago Manual of Style (16th Edition):
Ladd, Melanie Ann. “Purification, crystallization and structure determination of an azurin variant.” 2012. Masters Thesis, University of Minnesota. Accessed March 08, 2021.
http://purl.umn.edu/140046.
MLA Handbook (7th Edition):
Ladd, Melanie Ann. “Purification, crystallization and structure determination of an azurin variant.” 2012. Web. 08 Mar 2021.
Vancouver:
Ladd MA. Purification, crystallization and structure determination of an azurin variant. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Mar 08].
Available from: http://purl.umn.edu/140046.
Council of Science Editors:
Ladd MA. Purification, crystallization and structure determination of an azurin variant. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/140046
4.
Lechartier, Élodie.
Contribution au prognostic de pile à combustible PEMFC basé sur modèle semi-analytique : Contribution to PEM Fuel Cell prognostics based on a semi-analytical model.
Degree: Docteur es, Automatique, signal, productique, robotique, 2016, Besançon
URL: http://www.theses.fr/2016BESA2066
► Les préoccupations environnementales actuelles nous amènent à envisager des solutions alternatives, telles que la pile à combustible. Cette dernière malgré ses avantages présente des faiblesses…
(more)
▼ Les préoccupations environnementales actuelles nous amènent à envisager des solutions alternatives, telles que la pile à combustible. Cette dernière malgré ses avantages présente des faiblesses qui ralentissent sa diffusion au sein de l'industrie, entre autres, sa trop courte durée de vie. Face à cette considération, nous proposons d'appliquer le PHM à la PEMFC. Il faut donc développer le pronostic puis considérer son insertion au sein d'un système industriel. Nous choisissons de baser l'approche proposée sur un modèle de comportement, tout en proposant de combler le manque de connaissance concernant le vieillissement de la pile par les données, ce qui nous permet amène à développer une approche hybride. Dans ces travaux, le modèle comportemental est étudié sur des durées de plus en plus grandes pour enfin proposer une prédiction de l'ordre du millier d'heure. Afin de prendre en compte une implantation au sein d'un système réel, une étude sur la généricité et applicabilité de l'approche est réalisée. Ainsi, ces travaux proposent une approche de pronostic hybride basée sur un modèle de comportement et étudie son insertion au sein d'un système réel.
The current environmental concerns lead us to consider alternative solutions. The fuel cell can be one of them with numerous advantages, it presents however weaknesses, especially, its life duration which is too short. Face to this issue, we offer to apply the PHM to the PEMFC. For that, it is necessary to develop the prognostics for this application and the possibility of the on-line implementation on an industrial system. It was chosen to base the approach on a behavioral model in which the knowledge gaps are completed with the use of data. So, the approach proposed here, is hybrid. In this work, the behavioral model is studied on laps of time longer in order to finally introduce a prediction of a thousand of hours. Then, the online implementation on a real system is considered with a genericity and an applicability study. This work proposes a hybrid prognostics approach based on a behavioral model and study its implementation on an industrial system.
Advisors/Committee Members: Péra, Marie-Cécile (thesis director), Zerhouni, Noureddine (thesis director), Gouriveau, Rafael (thesis director), Hissel, Daniel (thesis director).
Subjects/Keywords: PEMFC; PHM; Pronostic; Modèle semi-analytique; Hybrid; PEMFC; PHM; Prognostics; Semi-analytic model; Hybrid; 621.3
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APA (6th Edition):
Lechartier, E. (2016). Contribution au prognostic de pile à combustible PEMFC basé sur modèle semi-analytique : Contribution to PEM Fuel Cell prognostics based on a semi-analytical model. (Doctoral Dissertation). Besançon. Retrieved from http://www.theses.fr/2016BESA2066
Chicago Manual of Style (16th Edition):
Lechartier, Élodie. “Contribution au prognostic de pile à combustible PEMFC basé sur modèle semi-analytique : Contribution to PEM Fuel Cell prognostics based on a semi-analytical model.” 2016. Doctoral Dissertation, Besançon. Accessed March 08, 2021.
http://www.theses.fr/2016BESA2066.
MLA Handbook (7th Edition):
Lechartier, Élodie. “Contribution au prognostic de pile à combustible PEMFC basé sur modèle semi-analytique : Contribution to PEM Fuel Cell prognostics based on a semi-analytical model.” 2016. Web. 08 Mar 2021.
Vancouver:
Lechartier E. Contribution au prognostic de pile à combustible PEMFC basé sur modèle semi-analytique : Contribution to PEM Fuel Cell prognostics based on a semi-analytical model. [Internet] [Doctoral dissertation]. Besançon; 2016. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2016BESA2066.
Council of Science Editors:
Lechartier E. Contribution au prognostic de pile à combustible PEMFC basé sur modèle semi-analytique : Contribution to PEM Fuel Cell prognostics based on a semi-analytical model. [Doctoral Dissertation]. Besançon; 2016. Available from: http://www.theses.fr/2016BESA2066
Northeastern University
5.
Mendes, Alexandre Consul.
Proportional hazard model applications in reliability.
Degree: PhD, Department of Mechanical and Industrial Engineering, 2014, Northeastern University
URL: http://hdl.handle.net/2047/d20005004
► This dissertation proposes two main methods as a modification of the semi-parametric Proportional Hazard Model (PHM) with innovative application for reliability testing. The first method…
(more)
▼ This dissertation proposes two main methods as a modification of the semi-parametric Proportional Hazard Model (PHM) with innovative application for reliability testing. The first method developed uses a median of lifetime survival history for subjects with multiple occurrences to be modeled using the non-recurrent PHM method. The second method developed proposes censoring of influential observations, applying recurrent PHM theory. Both methods are validated using small electromechanical appliances with covariates identifying typical user performance as part of accelerated reliability testing.; The Median PHM method is developed to allow the treatment of time-dependent covariates and competing failure types, which is fairly often necessary to properly model reliability studies. The advantages of this method are discussed and verified to provide the statistics or reliability engineer practitioners with the ability to evaluate multiple stresses, multiple covariates in accelerated reliability testing without the need to fit a physical model for the failure type and define a parametric distribution to model the acceleration parameter of interest. The analysis is presented in terms of hazard ratios that have immediate application for categorical covariates test levels and is easily extended for continuous covariates. Immediate plots for reliability and hazard curves are produced to enhance the analysis of the reliability model. Mendes develops the likelihood function with time-dependent covariates and presents a method to lay out the data and correct the input for the time-dependent covariate value derived from multiple measures for the original subject with multiple failure occurrences. Different models per failure type are evaluated.; The second method, Censored PHM method, is proposed to provide help when too many repeated events for a given subject may bias the analysis using the PHM for recurrent events. The method censors the multiple occurrences at a given threshold that might be related to a reliability product requirement or increased dependency between failure measures. The likelihood function for this method is simpler as the retrieval for covariate levels, since the censored subjects are maintained in the modeling analysis as part of the risk set. Fixed Effects and Stratified Cox models are applied to treat the recurrent events.; Data set arrangements for recurrent events are available in the literature; however the author reviews additional techniques to separate failure modes and properly assign categorical and continuous time-dependent covariate values when both methods are used. A complete guide to the modeling steps for the Median and Censored PHM methods proposed for reliability modeling is presented in the conclusion of this study.
Subjects/Keywords: Censored PHM; Median PHM; Proportional Hazard Model; recurrent events; reliability testing; small appliances; Industrial Engineering; Statistics and Probability
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APA (6th Edition):
Mendes, A. C. (2014). Proportional hazard model applications in reliability. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/d20005004
Chicago Manual of Style (16th Edition):
Mendes, Alexandre Consul. “Proportional hazard model applications in reliability.” 2014. Doctoral Dissertation, Northeastern University. Accessed March 08, 2021.
http://hdl.handle.net/2047/d20005004.
MLA Handbook (7th Edition):
Mendes, Alexandre Consul. “Proportional hazard model applications in reliability.” 2014. Web. 08 Mar 2021.
Vancouver:
Mendes AC. Proportional hazard model applications in reliability. [Internet] [Doctoral dissertation]. Northeastern University; 2014. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/2047/d20005004.
Council of Science Editors:
Mendes AC. Proportional hazard model applications in reliability. [Doctoral Dissertation]. Northeastern University; 2014. Available from: http://hdl.handle.net/2047/d20005004
6.
Lamoureux, Benjamin.
Development of an Integrated Approach for PHM - Prognostics and Health Management : Application to a Turbofan Fuel System : Développement d’une approche intégrée de PHM – Prognostics and Health Management : Application au Circuit Carburant d’un Turboréacteur.
Degree: Docteur es, Automatique, 2014, Paris, ENSAM
URL: http://www.theses.fr/2014ENAM0018
► Pour les constructeurs de moteurs d'avions comme Snecma, la disponibilité est un des enjeux clés de l'avenir. En effet, la limitation des retards et annulations…
(more)
▼ Pour les constructeurs de moteurs d'avions comme Snecma, la disponibilité est un des enjeux clés de l'avenir. En effet, la limitation des retards et annulations de vols ainsi que la réduction de la fréquence et de la durée des opérations de maintenance pourraient entraîner des économies importantes. Pour accroître la disponibilité, l'outil le plus utilisé actuellement est le "prognostics and health management" (PHM). La première contribution de la thèse est de proposer des cadres terminologique et fonctionnel pour le développement du PHM adapté aux spécificités des moteurs d'avions. Par la suite, une approche intégrée basée sur le nouveau modèle en V3 est formalisée. La seconde contribution est un processus basé sur les modèles pour le développement de la partie embarquée chargée de l'extraction des indicateurs de santé. Elle est basée sur l'analyse de sensibilité, la régression par vecteurs supports et des nouveaux indicateurs de performances. Puisque ce processus est réalisé avant l'entrée en service, les données stochastiques sont obtenues par propagation d'incertitudes. Pour surmonter les temps de calcul liés aux évaluations du modèle, des métamodèles sont utilisés. Plus particulièrement, la troisième contribution de la thèse est une technique originale combinant régression par vecteurs supports et Krigeage. L'approche globale est finalement testée sur le système carburant d'un moteur d'avion. Les résultats sont prometteurs, tant au niveau industriel pour les précieuses informations qu'elle fournit sur la qualité du jeu d'indicateurs de santé qu'au niveau académique pour la précision apportée par la nouvelle approche du Krigeage-SVR.
For manufacturers of aircraft engines such as Snecma, the increase of systems availability is one of the key challenges of the future. Indeed, the limitation of delays and cancellations and the reduction of maintenance operations frequency and duration could lead to important costs savings. To improve availability, the most proven tool is currently prognostics and health management (PHM). The first contribution of this thesis work is to propose complete terminological and functional frameworks for the development of PHM adapted to the specific application on aircraft engines. Subsequently, an integrated development approach based on the original V3-model is formalized. The second contribution is an original model-based process for the development of the embedded extraction of health indicators, based on sensitivity analysis, support vector regression and original performance indicators for the validation. Since it is aimed at being performed before the entry into service, the stochastic data are issued from Monte-Carlo based uncertainties propagation. In order to overcome the prohibitive computation time of the model evaluations, surrogate models are used. More particularly, the third contribution of this thesis work is an original technique combining support vector regression with Kriging. The whole approach is finally tested on an aircraft engine fuel system. The results are…
Advisors/Committee Members: Lorong, Philippe (thesis director).
Subjects/Keywords: Phm; Turboréacteur; Indicateurs de santé; Indicateurs de performances; Analyse de sensibilité; Krigeage; Phm; Turbofan; Health indicators; Performances indicators; Sensitivity Analysis; Kriging
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APA ·
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Manager
APA (6th Edition):
Lamoureux, B. (2014). Development of an Integrated Approach for PHM - Prognostics and Health Management : Application to a Turbofan Fuel System : Développement d’une approche intégrée de PHM – Prognostics and Health Management : Application au Circuit Carburant d’un Turboréacteur. (Doctoral Dissertation). Paris, ENSAM. Retrieved from http://www.theses.fr/2014ENAM0018
Chicago Manual of Style (16th Edition):
Lamoureux, Benjamin. “Development of an Integrated Approach for PHM - Prognostics and Health Management : Application to a Turbofan Fuel System : Développement d’une approche intégrée de PHM – Prognostics and Health Management : Application au Circuit Carburant d’un Turboréacteur.” 2014. Doctoral Dissertation, Paris, ENSAM. Accessed March 08, 2021.
http://www.theses.fr/2014ENAM0018.
MLA Handbook (7th Edition):
Lamoureux, Benjamin. “Development of an Integrated Approach for PHM - Prognostics and Health Management : Application to a Turbofan Fuel System : Développement d’une approche intégrée de PHM – Prognostics and Health Management : Application au Circuit Carburant d’un Turboréacteur.” 2014. Web. 08 Mar 2021.
Vancouver:
Lamoureux B. Development of an Integrated Approach for PHM - Prognostics and Health Management : Application to a Turbofan Fuel System : Développement d’une approche intégrée de PHM – Prognostics and Health Management : Application au Circuit Carburant d’un Turboréacteur. [Internet] [Doctoral dissertation]. Paris, ENSAM; 2014. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2014ENAM0018.
Council of Science Editors:
Lamoureux B. Development of an Integrated Approach for PHM - Prognostics and Health Management : Application to a Turbofan Fuel System : Développement d’une approche intégrée de PHM – Prognostics and Health Management : Application au Circuit Carburant d’un Turboréacteur. [Doctoral Dissertation]. Paris, ENSAM; 2014. Available from: http://www.theses.fr/2014ENAM0018
7.
Mounkaila, Mahamadou.
Analyse impédancemétrique pour le suivi de cuisson ou de santé des structures composites carbone/époxyde : vers des matériaux intelligents pour le PHM des structures composites : Impedance analysis for cure and health monitoring of the carbon fiber/epoxy composites : towards intelligent materials for the PHM (Prognostics and Health Management).
Degree: Docteur es, Electronique, 2016, Université Toulouse III – Paul Sabatier
URL: http://www.theses.fr/2016TOU30066
► Les matériaux composites de haute performance à base de fibres de carbone sont de plus en plus utilisés dans des secteurs où la sécurité est…
(more)
▼ Les matériaux composites de haute performance à base de fibres de carbone sont de plus en plus utilisés dans des secteurs où la sécurité est critique (aéronautique, spatial, génie civil...). Ces matériaux offrent des performances mécaniques très élevées, par rapport à leur densité (légèreté, rigidité...). Ils offrent de nombreux avantages tels que la résistance mécanique, la réduction de masse et de consommation. Par conséquent, il est important de connaître Les caractéristiques du matériau lors de son processus d'élaboration (durcissement ou cuisson) ou lors de son utilisation. Dans le but d'optimiser l'utilisation ou de contrôler l'intégrité, les efforts sont employés à l'aide de plusieurs techniques pour surveiller le cycle de cuisson ou la santé des structures composites lors du conditionnement et en service. Au-delà des méthodes existantes de mesure unique de la résistance ou de la capacité du matériau, nous présentons ici une technique d'analyse d'impédance électrique afin d'extraire certaines propriétés spécifiques du matériau (résistance, capacité, Impédance et argument) dans le but de connaître son comportement. La micro structure du matériau étant faite de conducteur (fibre de carbone) et d'isolant (résine), un modèle de la conduction électrique a été établi en utilisant un réseau de résistance (RP) et de capacité (CP) parallèles d'impédance caractéristique Z. Puis le matériau est instrumenté à cœur à l'aide d'électrodes minces et flexibles (flex). Ensuite, une analyse de spectroscopie d'impédance est réalisée sur des échantillons en cycle de cuisson et en poste cuisson lors des tests mécaniques grâce un banc de mesure spécifiquement développé. Les résultats de l'analyse renseignent sur les propriétés intrinsèques du matériau et montrent une sensibilité de ces propriétés électriques (RP et CP ou Z et θ) en fonction de l'évolution du cycle et des tests mécaniques. Il est donc possible de faire le Structural Health Monitoring (SHM) ou mieux encore le Prognostics and health management (PHM).
The high-performance composite materials based on carbon fiber are increasingly used in critical security areas (aeronautics and civil engineering) for the high mechanical performances as regards to their low density. They offer many benefits such as mechanical strength, mass and consumption reduction. Thus, it is important to know their characteristics during curing process or their use. With the aim to optimize their use or to control their integrity, efforts are employed by using several techniques to monitor their curing cycle or the health of the structures during the conditioning stage and the service stage. Beyond the existing methods of unique measurement of the resistance or the capacitance of the material, we present herein a technique of electrical impedance analysis to extract some specific material properties (resistance, capacitance, Impedance and argument) in order to know its behavior. As the microstructure of the material contains a conductor part (carbon fiber) and an insulator part (resin), a…
Advisors/Committee Members: Camps, Thierry (thesis director), Marguerès, Philippe (thesis director).
Subjects/Keywords: Propriétés électriques des composites; Suivi de cuisson des composites; SHM; PHM
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APA ·
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APA (6th Edition):
Mounkaila, M. (2016). Analyse impédancemétrique pour le suivi de cuisson ou de santé des structures composites carbone/époxyde : vers des matériaux intelligents pour le PHM des structures composites : Impedance analysis for cure and health monitoring of the carbon fiber/epoxy composites : towards intelligent materials for the PHM (Prognostics and Health Management). (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2016TOU30066
Chicago Manual of Style (16th Edition):
Mounkaila, Mahamadou. “Analyse impédancemétrique pour le suivi de cuisson ou de santé des structures composites carbone/époxyde : vers des matériaux intelligents pour le PHM des structures composites : Impedance analysis for cure and health monitoring of the carbon fiber/epoxy composites : towards intelligent materials for the PHM (Prognostics and Health Management).” 2016. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed March 08, 2021.
http://www.theses.fr/2016TOU30066.
MLA Handbook (7th Edition):
Mounkaila, Mahamadou. “Analyse impédancemétrique pour le suivi de cuisson ou de santé des structures composites carbone/époxyde : vers des matériaux intelligents pour le PHM des structures composites : Impedance analysis for cure and health monitoring of the carbon fiber/epoxy composites : towards intelligent materials for the PHM (Prognostics and Health Management).” 2016. Web. 08 Mar 2021.
Vancouver:
Mounkaila M. Analyse impédancemétrique pour le suivi de cuisson ou de santé des structures composites carbone/époxyde : vers des matériaux intelligents pour le PHM des structures composites : Impedance analysis for cure and health monitoring of the carbon fiber/epoxy composites : towards intelligent materials for the PHM (Prognostics and Health Management). [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2016. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2016TOU30066.
Council of Science Editors:
Mounkaila M. Analyse impédancemétrique pour le suivi de cuisson ou de santé des structures composites carbone/époxyde : vers des matériaux intelligents pour le PHM des structures composites : Impedance analysis for cure and health monitoring of the carbon fiber/epoxy composites : towards intelligent materials for the PHM (Prognostics and Health Management). [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2016. Available from: http://www.theses.fr/2016TOU30066
Cranfield University
8.
Wang, Xiaoyang.
Aircraft fuel system prognostics and health management.
Degree: MSc by Research, 2012, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/7214
► This thesis contains the specific description of Group Design Project (GDP) and Individual Research Project (IRP) that are undertaken by the author and form part…
(more)
▼ This thesis contains the specific description of Group Design Project (GDP) and
Individual Research Project (IRP) that are undertaken by the author and form
part of the degree of Master of Science.
The target of GDP is to develop a novel and unique commercial flying wing
aircraft titled FW-11. FW-11 is a three-year collaborative civil aircraft project
between Aviation Industry Corporation of China (AVIC) and Cranfield University.
According to the market analysis result conducted by the author, 250 seats
capacity and 7500 nautical miles were chosen as the design targets.
The IRP is the further study of GDP, which is to enhance the competitive
capability by deploying prognostics and health management (PHM) technology
to the fuel system of FW-11. As a novel and brand-new technology, PHM
enables the real-time transformation of system status data into alert and
maintenance information during all ground or flight operating phases to improve
the aircraft reliability and operating costs. Aircraft fuel system has a great
impact on flight safety. Therefore, the development of fuel system PHM concept
is necessary.
This thesis began with an investigation of PHM, then a safety and reliability
analysis of fuel system was conducted by using FHA, FMEA and FTA.
According to these analyses, fuel temperature diagnosis and prognosis were
chosen as a case study to improve the reliability and safety of FW-11. The PHM
architecture of fuel temperature had been established. A fuel temperature
prediction model was also introduced in this thesis.
Subjects/Keywords: PHM; Reliability; Safety; Fuel temperature prediction; Flying wing
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APA (6th Edition):
Wang, X. (2012). Aircraft fuel system prognostics and health management. (Masters Thesis). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/7214
Chicago Manual of Style (16th Edition):
Wang, Xiaoyang. “Aircraft fuel system prognostics and health management.” 2012. Masters Thesis, Cranfield University. Accessed March 08, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/7214.
MLA Handbook (7th Edition):
Wang, Xiaoyang. “Aircraft fuel system prognostics and health management.” 2012. Web. 08 Mar 2021.
Vancouver:
Wang X. Aircraft fuel system prognostics and health management. [Internet] [Masters thesis]. Cranfield University; 2012. [cited 2021 Mar 08].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/7214.
Council of Science Editors:
Wang X. Aircraft fuel system prognostics and health management. [Masters Thesis]. Cranfield University; 2012. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/7214
Cranfield University
9.
Cubillo , Adrian.
Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission.
Degree: PhD, 2016, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/11585
► Health condition monitoring, commonly referred as Integrated Vehicle Health Management (IVHM) for fleets or vehicles, studies the current and future health state of a system.…
(more)
▼ Health condition monitoring, commonly referred as Integrated Vehicle Health Management (IVHM) for fleets or vehicles, studies the current and future health state of a system. Health monitoring techniques based on data driven approaches have proven successful in several areas and are easily scalable; however they do not rely on the understating of the physics of failure; whereas Physics-based Model (PbM) approaches require expert knowledge of the failure modes and are based on the understanding of the component behaviour and degradation mechanisms. The development of IVHM is particularly challenging for legacy aircraft due to the restrictive regulations of the aerospace industry.
This thesis proposes a novel PbM technique to detect metal-metal contact in hydrodynamic bearings. The planetary transmission of an aircraft’s Integrated Drive Generator (IDG) is used as a case study. Research on the detection of metal-metal contact in hydrodynamic bearings has focused on data driven approaches using vibration or acoustic emissions rather than on PbMs. The proposed technique estimates metal-metal contact by modelling the physical phenomena involved in the failure mechanism and only the speed, load and temperature are required as inputs, all of them available in the IDG and not requiring any additional sensors.
The study of metal-metal in hydrodynamic bearings in the field of tribology has focused on mixed lubrication models of the whole bearing, or computational models accounting for local effect under the hydrodynamic lubrication region. In addition to the IVHM technique, this thesis contributes to the field of tribology by proposing a computational mixed lubrication model capable of studying metal-metal contact locally along the lubricated surface of the bearing. Experimental results of a plain journal bearing have been used to validate the PbM and a replica of the transmission of the IDG has been tested to evaluate the effectiveness of the proposed technique at detecting metal-metal contact.
Subjects/Keywords: IVHM; PHM; PbM; journal bearing; diagnostics; mixed lubrication; aerospace
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Export
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APA (6th Edition):
Cubillo , A. (2016). Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/11585
Chicago Manual of Style (16th Edition):
Cubillo , Adrian. “Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission.” 2016. Doctoral Dissertation, Cranfield University. Accessed March 08, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/11585.
MLA Handbook (7th Edition):
Cubillo , Adrian. “Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission.” 2016. Web. 08 Mar 2021.
Vancouver:
Cubillo A. Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission. [Internet] [Doctoral dissertation]. Cranfield University; 2016. [cited 2021 Mar 08].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11585.
Council of Science Editors:
Cubillo A. Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission. [Doctoral Dissertation]. Cranfield University; 2016. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11585
Cranfield University
10.
Cubillo, Adrian.
Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission.
Degree: PhD, 2016, Cranfield University
URL: http://dspace.lib.cranfield.ac.uk/handle/1826/11585
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705049
► Health condition monitoring, commonly referred as Integrated Vehicle Health Management (IVHM) for fleets or vehicles, studies the current and future health state of a system.…
(more)
▼ Health condition monitoring, commonly referred as Integrated Vehicle Health Management (IVHM) for fleets or vehicles, studies the current and future health state of a system. Health monitoring techniques based on data driven approaches have proven successful in several areas and are easily scalable; however they do not rely on the understating of the physics of failure; whereas Physics-based Model (PbM) approaches require expert knowledge of the failure modes and are based on the understanding of the component behaviour and degradation mechanisms. The development of IVHM is particularly challenging for legacy aircraft due to the restrictive regulations of the aerospace industry. This thesis proposes a novel PbM technique to detect metal-metal contact in hydrodynamic bearings. The planetary transmission of an aircraft’s Integrated Drive Generator (IDG) is used as a case study. Research on the detection of metal-metal contact in hydrodynamic bearings has focused on data driven approaches using vibration or acoustic emissions rather than on PbMs. The proposed technique estimates metal-metal contact by modelling the physical phenomena involved in the failure mechanism and only the speed, load and temperature are required as inputs, all of them available in the IDG and not requiring any additional sensors. The study of metal-metal in hydrodynamic bearings in the field of tribology has focused on mixed lubrication models of the whole bearing, or computational models accounting for local effect under the hydrodynamic lubrication region. In addition to the IVHM technique, this thesis contributes to the field of tribology by proposing a computational mixed lubrication model capable of studying metal-metal contact locally along the lubricated surface of the bearing. Experimental results of a plain journal bearing have been used to validate the PbM and a replica of the transmission of the IDG has been tested to evaluate the effectiveness of the proposed technique at detecting metal-metal contact.
Subjects/Keywords: 621.8; IVHM; PHM; PbM; journal bearing; diagnostics; mixed lubrication; aerospace
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Cubillo, A. (2016). Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/11585 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705049
Chicago Manual of Style (16th Edition):
Cubillo, Adrian. “Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission.” 2016. Doctoral Dissertation, Cranfield University. Accessed March 08, 2021.
http://dspace.lib.cranfield.ac.uk/handle/1826/11585 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705049.
MLA Handbook (7th Edition):
Cubillo, Adrian. “Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission.” 2016. Web. 08 Mar 2021.
Vancouver:
Cubillo A. Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission. [Internet] [Doctoral dissertation]. Cranfield University; 2016. [cited 2021 Mar 08].
Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11585 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705049.
Council of Science Editors:
Cubillo A. Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission. [Doctoral Dissertation]. Cranfield University; 2016. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11585 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705049
Université de Sherbrooke
11.
Mulligan, Kyle.
Stratégies robustes pour le suivi et la prédiction de l'endommagement de structures composites à l'aide de piézocéramiques embarquées.
Degree: 2013, Université de Sherbrooke
URL: http://savoirs.usherbrooke.ca/handle/11143/156
► À l'heure actuelle, il existe de nombreuses machines de la vie quotidienne instrumentées avec des capteurs responsables de récolter des données. Plusieurs de ces capteurs…
(more)
▼ À l'heure actuelle, il existe de nombreuses machines de la vie quotidienne instrumentées avec des capteurs responsables de récolter des données. Plusieurs de
ces capteurs sont installés dans le but d'exploiter les données à des fins de diagnostic. Dans la plupart des cas, les données abondantes et complexes ne peuvent être analysées facilement par un être humain. Ces données ne sont souvent que très partiellement exploitées. Ceci est également le cas dans le domaine de l'aéronautique. Le fonctionnement moderne des avions commerciaux génère de vastes quantités de données issues non seulement des capteurs à bord de l'avion, mais aussi des données obtenues à partir des procédures de maintenance. Comme pour des machines de la vie quotidienne, ces données ne sont pas exploitées de manière suffisamment efficace.
Le pronostic par exploitation de données, basé sur des algorithmes d'apprentissage, est depuis peu envisagé dans le traitement des données. Ce projet présente son application dans le domaine de l'aéronautique pour la prédiction de la durée de vie résiduelle des structures en composite faisant partie d'un avion suite à un endommagement par impact. Ce mémoire par articles est divisé en cinq parties. Les principaux sujets traités concernent les matériaux composites, la propagation d'ondes, la surveillance embarquée des structures ainsi que la méthode de pronostic. La première partie expose l'état de l'art. La seconde partie présente une étude de la propagation des ondes guidées dans une structure transparente et isotrope
contenant un ou plusieurs défauts. Cette étude est menée à l'aide d'un système de
surveillance piézocéramique qui peut lui aussi être affecté d'un défaut. Les résultats obtenus démontrent que la couche adhésive sous les capteurs piézocéramiques se dégrade avec la présence d'impact. Des courbes de calibration expérimentales peuvent être construites pour compenser la dégradation de la couche adhésive suite à un impact. En détectant et en compensant une dégradation du système de surveillance piezocéramique ceci permet une amélioration de la robustesse du pronostic. Le troisième chapitre présente une étude des ondes guidées dans une structure isotrope et opaque. Plutôt que d'utiliser des courbes de calibration expérimentales, un modèle numérique est développé. Ce modèle rend possible la compensation de défauts dans les systèmes de surveillance piézocéramiques installés sur des métaux et sur des matériaux composites.
Les quatrième et cinquième parties dérivent l'étape de pronostic. Dans un premier
temps le traitement des données d'un système de surveillance piézocéramique monté sur des échantillons en composite est présenté. Suit la transformation des informations brutes mesurées par les transducteurs en paramètres permettant d'identifier des tendances lors d'un dommage important sur l'échantillon. Ces paramètres sont alors entrés dans les modèles basés sur des algorithmes d'apprentissage génériques. La cinquième partie détaille la méthode de compensation d'une dégradation du système de…
Advisors/Committee Members: Masson, Patrice (advisor).
Subjects/Keywords: Exploitation de données; Pronostique; SHM; PHM; Matériaux composites
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Mulligan, K. (2013). Stratégies robustes pour le suivi et la prédiction de l'endommagement de structures composites à l'aide de piézocéramiques embarquées. (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://savoirs.usherbrooke.ca/handle/11143/156
Chicago Manual of Style (16th Edition):
Mulligan, Kyle. “Stratégies robustes pour le suivi et la prédiction de l'endommagement de structures composites à l'aide de piézocéramiques embarquées.” 2013. Doctoral Dissertation, Université de Sherbrooke. Accessed March 08, 2021.
http://savoirs.usherbrooke.ca/handle/11143/156.
MLA Handbook (7th Edition):
Mulligan, Kyle. “Stratégies robustes pour le suivi et la prédiction de l'endommagement de structures composites à l'aide de piézocéramiques embarquées.” 2013. Web. 08 Mar 2021.
Vancouver:
Mulligan K. Stratégies robustes pour le suivi et la prédiction de l'endommagement de structures composites à l'aide de piézocéramiques embarquées. [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2013. [cited 2021 Mar 08].
Available from: http://savoirs.usherbrooke.ca/handle/11143/156.
Council of Science Editors:
Mulligan K. Stratégies robustes pour le suivi et la prédiction de l'endommagement de structures composites à l'aide de piézocéramiques embarquées. [Doctoral Dissertation]. Université de Sherbrooke; 2013. Available from: http://savoirs.usherbrooke.ca/handle/11143/156
INP Toulouse
12.
Le Maitre Gonzalez, Esteban Adolfo.
Définition d'une fonction de pronostic des systèmes techniques multi composants prenant en compte les incertitudes à partir des pronostics de leurs composants : Definition of a generic prognostic function of technical multi-component systems taking into account the uncertainties of the predictions of their components.
Degree: Docteur es, Génie industriel, 2019, INP Toulouse
URL: http://www.theses.fr/2019INPT0012
► Face au défi des entreprises pour le maintien de leurs équipements au maximum de leur fiabilité, de leur disponibilité, de leur rentabilité et de leur…
(more)
▼ Face au défi des entreprises pour le maintien de leurs équipements au maximum de leur fiabilité, de leur disponibilité, de leur rentabilité et de leur sécurité au coût de maintenance minimum, des stratégies de maintenance telles que le CBM et le PHM ont été développées. Pour mettre en œuvre ces stratégies, comme pour la planification des activités de production il est nécessaire de connaître l’aptitude des systèmes à réaliser les futures tâches afin de réaliser le séquencement des opérations de production et de maintenance. Cette thèse présente les éléments d'une fonction générique qui évalue la capacité des systèmes techniques multi-composants à exécuter les tâches de production de biens ou de services assignées. Ce manuscrit présente une proposition de modélisation de systèmes techniques multi-composants représentant les différentes entités qui les composent, leurs états et leurs relations. Plusieurs types d’entités ont été identifiés. Pour chacun d’eux, des inférences sont proposées pour définir à l’intérieur du système l’aptitude de l’entité à accomplir les futures tâches de production à partir des évaluations de son état présent et futur et des évaluations des états présents et futurs des autres entités avec lesquelles elle est en relation. Ces évaluations des états présents et futurs sont basées sur l’exploitation de pronostics locaux des composants. Ces pronostics sont des prévisions qui intrinsèquement comportent des incertitudes pouvant être aléatoires ou épistémiques. La fonction proposée et les inférences prennent en compte ces deux formes d’incertitudes. Pour cela, les traitements et la fonction proposée exploite des éléments de la théorie de Dempster-Shafer. La modélisation des systèmes multi-composants pouvant être représentée sous la forme de graphes dont les états des nœuds dépendent de données comportant des incertitudes, des éléments des réseaux bayésiens sont également utilisés. Cette fonction fournit des indicateurs, sur l’aptitude de chaque entité du système à accomplir les futures tâches de production mais aussi indique les composants nécessitant une intervention afin d’améliorer cette aptitude. Ainsi, ces indicateurs constituent les éléments d'aide à la décision pour la planification des opérations de maintenance de façon conditionnelle et préventive, mais aussi pour la planification des opérations de production.
One major challenge of companies consists in maintaining their technical production resources at the maximum level of reliability, availability, profitability and safety for a minimum maintenance cost, maintenance strategies such as CBM and PHM have been developed. To implement these strategies, as with production activity planning, it is necessary to know the ability of systems to perform future tasks to order production and maintenance operations. This thesis presents the generic function that evaluates the ability of multi-component technical systems to perform the production tasks of goods or services. This manuscript presents a proposal for the modelling of multi-component…
Advisors/Committee Members: Archimède, Bernard (thesis director), Desforges, Xavier (thesis director).
Subjects/Keywords: Pronostic de composants; Systèmes techniques multi-composants; CBM; PHM; Théorie de Dempster Shafer; Réseaux bayésiens; Prognosis; Technical Multi-Component Systems; Multi-states; PHM; Uncertainty; Bayesian networks
Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Le Maitre Gonzalez, E. A. (2019). Définition d'une fonction de pronostic des systèmes techniques multi composants prenant en compte les incertitudes à partir des pronostics de leurs composants : Definition of a generic prognostic function of technical multi-component systems taking into account the uncertainties of the predictions of their components. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2019INPT0012
Chicago Manual of Style (16th Edition):
Le Maitre Gonzalez, Esteban Adolfo. “Définition d'une fonction de pronostic des systèmes techniques multi composants prenant en compte les incertitudes à partir des pronostics de leurs composants : Definition of a generic prognostic function of technical multi-component systems taking into account the uncertainties of the predictions of their components.” 2019. Doctoral Dissertation, INP Toulouse. Accessed March 08, 2021.
http://www.theses.fr/2019INPT0012.
MLA Handbook (7th Edition):
Le Maitre Gonzalez, Esteban Adolfo. “Définition d'une fonction de pronostic des systèmes techniques multi composants prenant en compte les incertitudes à partir des pronostics de leurs composants : Definition of a generic prognostic function of technical multi-component systems taking into account the uncertainties of the predictions of their components.” 2019. Web. 08 Mar 2021.
Vancouver:
Le Maitre Gonzalez EA. Définition d'une fonction de pronostic des systèmes techniques multi composants prenant en compte les incertitudes à partir des pronostics de leurs composants : Definition of a generic prognostic function of technical multi-component systems taking into account the uncertainties of the predictions of their components. [Internet] [Doctoral dissertation]. INP Toulouse; 2019. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2019INPT0012.
Council of Science Editors:
Le Maitre Gonzalez EA. Définition d'une fonction de pronostic des systèmes techniques multi composants prenant en compte les incertitudes à partir des pronostics de leurs composants : Definition of a generic prognostic function of technical multi-component systems taking into account the uncertainties of the predictions of their components. [Doctoral Dissertation]. INP Toulouse; 2019. Available from: http://www.theses.fr/2019INPT0012
University of Cincinnati
13.
Shi, Zhe.
Semi-supervised Ensemble Learning Methods for Enhanced
Prognostics and Health Management.
Degree: PhD, Engineering and Applied Science: Mechanical
Engineering, 2018, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522420632837268
► Advances in data acquisition and storage technologies have enabled the easy accumulation of a large amount of training data from many real-world applications in industry.…
(more)
▼ Advances in data acquisition and storage technologies
have enabled the easy accumulation of a large amount of training
data from many real-world applications in industry. However,
assigning labels to all those samples can be expensive because the
labeling process usually requires human expertise and is
time-consuming. In prognostics and health management (
PHM)
applications, the labels assigned to the condition monitoring data
represent the general health condition of a monitored system, which
can serve as a performance indicator(normal vs. faulty) or a
product quality metric (good vs. bad). In practice, it is common to
have a small portion of labeled samples and a large number of
unlabeled samples, however, without a sufficient amount of labeled
training samples, most supervised learning methods are unable to
produce an accurate generalized model. In addition, most of the
learning methods have their own pros and cons. When dealing with
the same data set, the result can be quite different based on the
method being used. Then, a question arises: how to extend the
capability of the learning algorithm to fully explore the
information behind the entire data set to generate a stronger
hypothesis. The research presented in this dissertation focuses on
exploring the methodology of utilizing unlabeled or partially
labeled samples with a group of weak learners to improve the
performance of current learning methods for
PHM applications.
Semi-supervised learning (SSL) and ensemble learning (EL) are two
important learning paradigms that were developed almost in parallel
but with different philosophies. SSL focuses on improving
generalization performance of learning models by including
unlabeled data, while EL takes advantage of a cluster of diverse
models to promote final prediction accuracy. The core research lies
in discovering the inherent correlation between labeled samples and
unlabeled samples and increasing diversity of ensemble weak
learners to ultimately minimize prediction error. Research supports
that it is promising to combine SSL and EL as a semi-supervised
ensemble learning (SSEL) framework to further improve the
capability of each other. The SSEL methods have been successfully
applied to several classical machine learning and pattern
recognition problems, such as image classification and natural
language processing. The success of these applications encourages
the study and development of effective SSEL methods for
PHM
applications.
Advisors/Committee Members: Lee, Jay (Committee Chair).
Subjects/Keywords: Mechanical Engineering; Regression; Classification; PHM; Semi-supervised Ensemble Learning; Unlabeled samples; Insufficient training data set
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shi, Z. (2018). Semi-supervised Ensemble Learning Methods for Enhanced
Prognostics and Health Management. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522420632837268
Chicago Manual of Style (16th Edition):
Shi, Zhe. “Semi-supervised Ensemble Learning Methods for Enhanced
Prognostics and Health Management.” 2018. Doctoral Dissertation, University of Cincinnati. Accessed March 08, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522420632837268.
MLA Handbook (7th Edition):
Shi, Zhe. “Semi-supervised Ensemble Learning Methods for Enhanced
Prognostics and Health Management.” 2018. Web. 08 Mar 2021.
Vancouver:
Shi Z. Semi-supervised Ensemble Learning Methods for Enhanced
Prognostics and Health Management. [Internet] [Doctoral dissertation]. University of Cincinnati; 2018. [cited 2021 Mar 08].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522420632837268.
Council of Science Editors:
Shi Z. Semi-supervised Ensemble Learning Methods for Enhanced
Prognostics and Health Management. [Doctoral Dissertation]. University of Cincinnati; 2018. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522420632837268
University of Cincinnati
14.
Feng, Jianshe.
Methodology of Adaptive Prognostics and Health Management in
Dynamic Work Environment.
Degree: PhD, Engineering and Applied Science: Mechanical
Engineering, 2020, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1593267012325542
► Prognostics and health management (PHM) has gradually become an essential technique to improve the availability and efficiency of a complex system. With the rapid advancement…
(more)
▼ Prognostics and health management (
PHM) has gradually
become an essential technique to improve the availability and
efficiency of a complex system. With the rapid advancement of
sensor technology and communication technology, a huge amount of
real-time data are generated from various industrial applications,
which brings new challenges to
PHM in the context of big data
streams. On one hand, high-volume stream data places a heavy demand
on data storage, communication, and
PHM modeling. On the other
hand, continuous change and drift are essential properties of
stream data in an evolving environment, which requires the
PHM
model to be capable to capture the new information in stream data
adaptively, efficiently and continuously. This research proposes a
systematic methodology to develop an effective online learning
PHM
with adaptive sampling techniques to fuse information from
continuous stream data. An adaptive sample selection strategy is
developed so that the representative samples can be effectively
selected in both off-line and online environment. In addition,
various data-driven models, including probabilistic models,
Bayesian algorithms, incremental methods, and ensemble algorithms,
are employed and integrated into the proposed methodology for model
establishment and updating with important samples selected from
streaming sequence. Finally, the effectiveness of proposed
systematic methodology is validated with four typical industrial
applications including power forecasting of a combined cycle power
plant, fault detection of hard disk drive, virtual metrology in
semiconductor manufacturing processes, and prognosis of battery
state of capacity. The result comparison between the proposed
methodology and state-of-art benchmark methods indicates that the
proposed methodology is capable to build an adaptive
PHM with
sustainable performance to deal with dynamic issues in processes,
which provides a promising way to prolong the
PHM model lifetime
after implementation.
Advisors/Committee Members: Lee, Jay (Committee Chair).
Subjects/Keywords: Engineering; adaptive PHM; sample selection; sample importance test; online modeling; sequential model updating
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APA (6th Edition):
Feng, J. (2020). Methodology of Adaptive Prognostics and Health Management in
Dynamic Work Environment. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1593267012325542
Chicago Manual of Style (16th Edition):
Feng, Jianshe. “Methodology of Adaptive Prognostics and Health Management in
Dynamic Work Environment.” 2020. Doctoral Dissertation, University of Cincinnati. Accessed March 08, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1593267012325542.
MLA Handbook (7th Edition):
Feng, Jianshe. “Methodology of Adaptive Prognostics and Health Management in
Dynamic Work Environment.” 2020. Web. 08 Mar 2021.
Vancouver:
Feng J. Methodology of Adaptive Prognostics and Health Management in
Dynamic Work Environment. [Internet] [Doctoral dissertation]. University of Cincinnati; 2020. [cited 2021 Mar 08].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1593267012325542.
Council of Science Editors:
Feng J. Methodology of Adaptive Prognostics and Health Management in
Dynamic Work Environment. [Doctoral Dissertation]. University of Cincinnati; 2020. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1593267012325542
15.
Skima, Haithem.
Pronostic et algorithmes distribués de décision post-pronostic dans les systèmes à base de MEMS : Pronostics and distributed algorithms for post-pronostics decsion marketing in MEMS-based.
Degree: Docteur es, Automatique, 2016, Besançon
URL: http://www.theses.fr/2016BESA2040
► Dans de nombreux secteurs industriels, la miniaturisation des systèmes est devenue une nécessité afin de réduire l’espace occupé, le poids, les prix et la consommation…
(more)
▼ Dans de nombreux secteurs industriels, la miniaturisation des systèmes est devenue une nécessité afin de réduire l’espace occupé, le poids, les prix et la consommation d’énergie et de matière. Pour ce faire, les industriels utilisent les Micro-Electro-Mechanical Systems (MEMS). En revanche, les MEMS présentent plusieurs problèmes de fiabilité dus à leurs nombreux mécanismes de défaillance qui ont un impact sur la disponibilité des systèmes dans lesquels ils sont utilisés. Il est alors important de surveiller ces microsystèmes, d’anticiper leurs défaillances et de recommander les actions nécessaires afin d’allonger leur durée de vie. Une solution efficace pour ce faire est de développer le Prognostics & Health Management (PHM) pour les MEMS. Dans cet esprit, la thèse porte sur le pronostic et l’étude de l’état de santé de MEMS et la prise de décision post-pronostic dans les systèmes contenant ces microsystèmes. L’objectif est de rendre un système à base de MEMS distribué intelligent en intégrant des modules d’évaluation et de prédiction de l’état de santé du système ainsi que des capacités d’auto-adaptation dépendant des missions que le système doit accomplir. Dans un premier temps, une approche de pronostic hybride pour les MEMS basée sur le filtrage particulaire est proposée. Dans un second temps, et afin de mieux utiliser les résultats de cette approche, une stratégie de décision post-pronostic dans les systèmes distribués à base de MEMS est introduite. Un simulateur distribué a été développé pour simuler la décision post-pronostic. La performance de l’approche de pronostic et de la stratégie de décision post-pronostic est validée sur une application réelle, à savoir un convoyeur modulaire à base de MEMS distribués. Un cycle complet de PHM est ainsi développé : de l’acquisition des données à la prise de décision.
In many industrial sectors, system miniaturization becomes mandatory, allowing reducing occupied space, weight, price, power and material consumption. For this, manufacturers use Micro-Electro- Mechanical Sytems (MEMS). However, MEMS devices have several reliability issues due to their numerous failure mechanisms, which have an impact on the availability of systems where they are utilized. Therefore, it is important to monitor these micro-systems, to anticipate their failures and to perform appropriate actions to maximize their lifespan. One possible solution is to develop the Prognostics & Health Management (PHM) for MEMS. The thesis deals then with the prognostics and the study of MEMS health state and the post-prognostics decision making in systems containing these micro-systems. The aim is to make a MEMS-based system distributed and intelligent by integrating modules of health state assessment and prediction and capacities of self-adaptability dependent of the tasks performed by the system. Firstly, a hybrid prognostics approach for MEMS based on the particle filtering is proposed. Secondly, and to better use the results of this approach, a post-prognostics decision strategy in MEMS-based…
Advisors/Committee Members: Varnier, Christophe (thesis director), Bourgeois, Julien (thesis director), Medjaher, Kamal (thesis director), Dedu, Eugen (thesis director).
Subjects/Keywords: PHM; Pronostic; MEMS; Decision post pronostic; Systèmes distribués; Algorithmes distribués; Micro system electromécaniques; Micro-Electro- Mechanical Sytems; Post-prognostics decision; 629.8
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APA (6th Edition):
Skima, H. (2016). Pronostic et algorithmes distribués de décision post-pronostic dans les systèmes à base de MEMS : Pronostics and distributed algorithms for post-pronostics decsion marketing in MEMS-based. (Doctoral Dissertation). Besançon. Retrieved from http://www.theses.fr/2016BESA2040
Chicago Manual of Style (16th Edition):
Skima, Haithem. “Pronostic et algorithmes distribués de décision post-pronostic dans les systèmes à base de MEMS : Pronostics and distributed algorithms for post-pronostics decsion marketing in MEMS-based.” 2016. Doctoral Dissertation, Besançon. Accessed March 08, 2021.
http://www.theses.fr/2016BESA2040.
MLA Handbook (7th Edition):
Skima, Haithem. “Pronostic et algorithmes distribués de décision post-pronostic dans les systèmes à base de MEMS : Pronostics and distributed algorithms for post-pronostics decsion marketing in MEMS-based.” 2016. Web. 08 Mar 2021.
Vancouver:
Skima H. Pronostic et algorithmes distribués de décision post-pronostic dans les systèmes à base de MEMS : Pronostics and distributed algorithms for post-pronostics decsion marketing in MEMS-based. [Internet] [Doctoral dissertation]. Besançon; 2016. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2016BESA2040.
Council of Science Editors:
Skima H. Pronostic et algorithmes distribués de décision post-pronostic dans les systèmes à base de MEMS : Pronostics and distributed algorithms for post-pronostics decsion marketing in MEMS-based. [Doctoral Dissertation]. Besançon; 2016. Available from: http://www.theses.fr/2016BESA2040
Brno University of Technology
16.
Jaroš, Martin.
Kritická sektorová analýza trhu s pohonnými hmotami: Critical Sector Analysis of the Fuel Market.
Degree: 2018, Brno University of Technology
URL: http://hdl.handle.net/11012/9202
► In my bachelor‘s thesis I have analysed the diesel fuel market in the Czech Republic from the point of view of the petrol stations offers…
(more)
▼ In my bachelor‘s thesis I have analysed the diesel fuel market in the Czech Republic from the point of view of the petrol stations offers as well the consumers demand. It concerns oligopoly market form, where the front positions are taken by foreign brands. I have determined the structure type by the data referring to the market power of particular petrol station networks and also thanks to the price research itself. Consumers behave quite often very illogically in this market due to the lack of available information. These conclusions I have obtained by the market research I did on active drivers. A modern solution is a new web portal establishment based on cooperation with petrol stations, which would provide information about the fuel market to the drivers.
Advisors/Committee Members: Škapa, Stanislav (advisor), Strašil, Pavel (referee).
Subjects/Keywords: benzín; nafta; PHM; výzkum trhu; konkurence; čerpací stanice; gas; diesel; fuel; market research; competition; petrol station
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APA (6th Edition):
Jaroš, M. (2018). Kritická sektorová analýza trhu s pohonnými hmotami: Critical Sector Analysis of the Fuel Market. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/9202
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jaroš, Martin. “Kritická sektorová analýza trhu s pohonnými hmotami: Critical Sector Analysis of the Fuel Market.” 2018. Thesis, Brno University of Technology. Accessed March 08, 2021.
http://hdl.handle.net/11012/9202.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jaroš, Martin. “Kritická sektorová analýza trhu s pohonnými hmotami: Critical Sector Analysis of the Fuel Market.” 2018. Web. 08 Mar 2021.
Vancouver:
Jaroš M. Kritická sektorová analýza trhu s pohonnými hmotami: Critical Sector Analysis of the Fuel Market. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/11012/9202.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jaroš M. Kritická sektorová analýza trhu s pohonnými hmotami: Critical Sector Analysis of the Fuel Market. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/9202
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
17.
Sutrisno, Edwin.
FAULT DETECTION AND PROGNOSTICS OF INSULATED GATE BIPOLAR TRANSISTOR (IGBT) USING A K-NEAREST NEIGHBOR CLASSIFICATION ALGORITHM.
Degree: Mechanical Engineering, 2013, University of Maryland
URL: http://hdl.handle.net/1903/14687
► Insulated Gate Bipolar Transistor (IGBT) is a power semiconductor device commonly used in medium to high power applications from household appliances, automotive, and renewable energy.…
(more)
▼ Insulated Gate Bipolar Transistor (IGBT) is a power semiconductor device commonly used in medium to high power applications from household appliances, automotive, and renewable energy. Health assessment of IGBT under field use is of interest due to costly system downtime that may be associated with IGBT failures. Conventional reliability approaches were shown by experimental data to suffer from large uncertainties when predicting IGBT lifetimes, partly due to their inability to adapt to varying loading conditions and part-to-part differences. This study developed a data-driven prognostic method to individually assess IGBT health based on operating data obtained from run-to-failure experiments. IGBT health was classified into healthy and faulty using a K-Nearest Neighbor Centroid Distance classification algorithm. A feature weight optimization method was developed to determine the influence of each feature toward classifying IGBT's health states.
Advisors/Committee Members: Pecht, Michael (advisor).
Subjects/Keywords: Engineering; Mathematics; Classification; IGBT; PHM; Prognostics
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APA ·
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Export
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APA (6th Edition):
Sutrisno, E. (2013). FAULT DETECTION AND PROGNOSTICS OF INSULATED GATE BIPOLAR TRANSISTOR (IGBT) USING A K-NEAREST NEIGHBOR CLASSIFICATION ALGORITHM. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/14687
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sutrisno, Edwin. “FAULT DETECTION AND PROGNOSTICS OF INSULATED GATE BIPOLAR TRANSISTOR (IGBT) USING A K-NEAREST NEIGHBOR CLASSIFICATION ALGORITHM.” 2013. Thesis, University of Maryland. Accessed March 08, 2021.
http://hdl.handle.net/1903/14687.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sutrisno, Edwin. “FAULT DETECTION AND PROGNOSTICS OF INSULATED GATE BIPOLAR TRANSISTOR (IGBT) USING A K-NEAREST NEIGHBOR CLASSIFICATION ALGORITHM.” 2013. Web. 08 Mar 2021.
Vancouver:
Sutrisno E. FAULT DETECTION AND PROGNOSTICS OF INSULATED GATE BIPOLAR TRANSISTOR (IGBT) USING A K-NEAREST NEIGHBOR CLASSIFICATION ALGORITHM. [Internet] [Thesis]. University of Maryland; 2013. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/1903/14687.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sutrisno E. FAULT DETECTION AND PROGNOSTICS OF INSULATED GATE BIPOLAR TRANSISTOR (IGBT) USING A K-NEAREST NEIGHBOR CLASSIFICATION ALGORITHM. [Thesis]. University of Maryland; 2013. Available from: http://hdl.handle.net/1903/14687
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cincinnati
18.
Zhu, Feibai.
Reconfigurable Platform for Prognostics Design and
Evaluation.
Degree: MS, Engineering and Applied Science: Mechanical
Engineering, 2011, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756503
► In the past decades, numerous efforts have been placed on the development of prognostic algorithms as well as overall design of Prognostic and Health…
(more)
▼ In the past decades, numerous efforts have
been placed on the development of prognostic algorithms as well as
overall design of Prognostic and Health Management (
PHM) systems.
This is in an effort to achieve increased safety, reliability and
sustainability for engineering systems today. However, it has been
observed that a lot of research efforts in the
PHM community have
concentrated on applying similar methodologies and algorithms in
solving similar problems. There is lack of a systematic approach
for prognostic modeling designs and inadequate practical
instructions on identifying the critical system elements, designing
experiment plans, setting research goals and determining the right
PHM tools for general applications, ranging from components to
machines to large-scale processes and systems. In addition, there
is a gap in
PHM literature today that focuses on the practical
implementation of prognostic solutions and such existing studies
are still in the research phase. In this thesis,
the major focus is to provide a systematic reconfigurable platform
to accelerate the Prognostics and Health Management (
PHM) process
through simplification of
PHM design, modeling, and evaluation.
Several prognostic frameworks found in the literature were compared
and discussed, and an enhanced practical framework for
PHM
applications has been introduced with comprehensive detail. In
addition, options were presented for hardware and software
deployment within the reconfigurable platform. National Instruments
(NI) hardware and LabVIEW software toolkit was finally selected to
develop the proposed reconfiguration prognostic platform, given
their great compatibility and comprehensive functions of data
collection, synchronization, management, analysis and result
reporting. Due to the lack of a
PHM toolkit in
NI LabVIEW, this thesis develops a LabVIEW-based toolkit consisting
of several key
PHM algorithms for health assessment, diagnosis, and
prediction. Specifically, the integrated toolkit includes most
frequently-used algorithms such as Logistic Regression,
Self-Organizing Maps, Neural Network, Support Vector Machine and
others. To facilitate the use of the toolkit, some integrated
(express VI) functions and graphical user interface were also
developed to accelerate the process of signal processing, sensor
fusion, health diagnosis and prognosis with minimum analyst
manipulation and less external knowledge input. The prognostic
platform can be easily configured and integrated into the
enterprise asset management system to deliver information for
maintaining optimal performance of the system. The performance and
application of the developed prognostic platform is validated for
real-world industrial case studies in motor, shaft and bearing
systems. The platform was successfully applied for different
objectives and application requirements, which demonstrates the
toolkit’s reconfigurable scheme and effectiveness for solving
real-world problems.
Advisors/Committee Members: Lee, Jay (Committee Chair).
Subjects/Keywords: Industrial Engineering; PHM; Prognositics; Reconfigurable; Platform; Maintenance; LabVIEW
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APA ·
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APA (6th Edition):
Zhu, F. (2011). Reconfigurable Platform for Prognostics Design and
Evaluation. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756503
Chicago Manual of Style (16th Edition):
Zhu, Feibai. “Reconfigurable Platform for Prognostics Design and
Evaluation.” 2011. Masters Thesis, University of Cincinnati. Accessed March 08, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756503.
MLA Handbook (7th Edition):
Zhu, Feibai. “Reconfigurable Platform for Prognostics Design and
Evaluation.” 2011. Web. 08 Mar 2021.
Vancouver:
Zhu F. Reconfigurable Platform for Prognostics Design and
Evaluation. [Internet] [Masters thesis]. University of Cincinnati; 2011. [cited 2021 Mar 08].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756503.
Council of Science Editors:
Zhu F. Reconfigurable Platform for Prognostics Design and
Evaluation. [Masters Thesis]. University of Cincinnati; 2011. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313756503
Université de Lorraine
19.
Abichou, Bouthaïna.
Contribution à la formalition de bilans/états de santé multi-niveaux d'un système pour aider à la prise de décision en maintenance : agrégation d'indicateurs par l'intégrale de Choquet : Contribution to the formalization of health assessment for a multi-layers system to aid maintenance decision making : Choquet integral-based aggregation of heterogeneous indicators.
Degree: Docteur es, Automatique, Traitement du signal et images, Génie informatique, 2013, Université de Lorraine
URL: http://www.theses.fr/2013LORR0020
► Dans cette thèse est défendu l'intérêt d'évaluer la santé d'un système/objet industriel multi-composants à travers un bilan de santé multi-niveaux hiérarchiques. Elle a donc pour…
(more)
▼ Dans cette thèse est défendu l'intérêt d'évaluer la santé d'un système/objet industriel multi-composants à travers un bilan de santé multi-niveaux hiérarchiques. Elle a donc pour objet principal de justifier les éléments essentiels du concept de bilan de santé générique qui représente l'état réel d'un système sous la forme d'un vecteur d'indicateurs de différentes natures. Vis-à-vis de ce fondement, la thèse se focalise plus spécifiquement sur les fonctions de détection des anomalies-normalisation et agrégation d'indicateurs pour élaborer un index synthétique représentatif de l'état de santé global pour chaque élément du système. Il est ainsi proposé, une nouvelle approche de détection conditionnelle des anomalies. Cette approche a pour intérêt de quantifier la déviation pour chaque indicateur par rapport à son mode de comportement nominal tout en prenant en compte le contexte dans lequel évolue le système. Une extension à l'exploitation de l'intégrale de Choquet en tant qu'opérateur d'agrégation des indicateurs est aussi proposée. Cette extension concerne, d'une part, un processus d'apprentissage non supervisé des capacités pour le niveau le plus inférieur dans l'abstraction, à savoir celui des composants, et d'autre part, une approche de mise en oeuvre de leur inférence d'un niveau à l'autre. Ces propositions sont appliquées sur un moteur diesel de navire, système essentiel du projet BMCI du pôle MER-PACA dans lequel s'inscrit cette thèse
This work is addressing the health assessment of a multi-component system by means of multi-levels health check-up. Thus scientific Ph. D. objective aims to establish items of a generic health check-up concept. It focuses specifically on the functions of anomaly detection, normalization and aggregation of different indicators to develop a synthetic index representing the overall health status for each element within the system. In that way, it is proposed a new approach for detecting conditional anomalies. This approach has the advantage of quantifying the deviation for each indicator compared to its nominal behavior while taking into account the context in which the system operates. An extension of the Choquet integral used as an operator aggregating indicators is also proposed. This extension regards on the one hand, a process of an unsupervised learning of the capacity coefficients for the lowest level of abstraction, namely components level, and on the other hand, an approach to inference them from one level to another. These contributions are implemented on a ship diesel engine which is the most critical system for the BMCI project of the MER-PACA pole to which this thesis is attached
Advisors/Committee Members: Iung, Benoît (thesis director), Voisin, Alexandre (thesis director).
Subjects/Keywords: PHM; Projet BMCI; Intégrale de Choquet; Bilan de santé; Détection des dérives; Agrégation d'indicateurs; Identification des capacités; PHM; BMCI Project; Choquet integral; Health check-up; Anomalies detection; Indicators aggregation; Capacities identification; 620.004 6
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APA ·
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APA (6th Edition):
Abichou, B. (2013). Contribution à la formalition de bilans/états de santé multi-niveaux d'un système pour aider à la prise de décision en maintenance : agrégation d'indicateurs par l'intégrale de Choquet : Contribution to the formalization of health assessment for a multi-layers system to aid maintenance decision making : Choquet integral-based aggregation of heterogeneous indicators. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2013LORR0020
Chicago Manual of Style (16th Edition):
Abichou, Bouthaïna. “Contribution à la formalition de bilans/états de santé multi-niveaux d'un système pour aider à la prise de décision en maintenance : agrégation d'indicateurs par l'intégrale de Choquet : Contribution to the formalization of health assessment for a multi-layers system to aid maintenance decision making : Choquet integral-based aggregation of heterogeneous indicators.” 2013. Doctoral Dissertation, Université de Lorraine. Accessed March 08, 2021.
http://www.theses.fr/2013LORR0020.
MLA Handbook (7th Edition):
Abichou, Bouthaïna. “Contribution à la formalition de bilans/états de santé multi-niveaux d'un système pour aider à la prise de décision en maintenance : agrégation d'indicateurs par l'intégrale de Choquet : Contribution to the formalization of health assessment for a multi-layers system to aid maintenance decision making : Choquet integral-based aggregation of heterogeneous indicators.” 2013. Web. 08 Mar 2021.
Vancouver:
Abichou B. Contribution à la formalition de bilans/états de santé multi-niveaux d'un système pour aider à la prise de décision en maintenance : agrégation d'indicateurs par l'intégrale de Choquet : Contribution to the formalization of health assessment for a multi-layers system to aid maintenance decision making : Choquet integral-based aggregation of heterogeneous indicators. [Internet] [Doctoral dissertation]. Université de Lorraine; 2013. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2013LORR0020.
Council of Science Editors:
Abichou B. Contribution à la formalition de bilans/états de santé multi-niveaux d'un système pour aider à la prise de décision en maintenance : agrégation d'indicateurs par l'intégrale de Choquet : Contribution to the formalization of health assessment for a multi-layers system to aid maintenance decision making : Choquet integral-based aggregation of heterogeneous indicators. [Doctoral Dissertation]. Université de Lorraine; 2013. Available from: http://www.theses.fr/2013LORR0020
20.
Hebrard, Yoann.
PHM Autonome : Application au roulement intelligent : Autonomous PHM : Application to smart bearing.
Degree: Docteur es, Génie mécanique, 2018, Lyon
URL: http://www.theses.fr/2018LYSEI004
► Dans un marché aéronautique en plein essor marqué par une croissance rapide du parc d’avions utilisées à travers le monde, l’optimisation de la maintenance devient…
(more)
▼ Dans un marché aéronautique en plein essor marqué par une croissance rapide du parc d’avions utilisées à travers le monde, l’optimisation de la maintenance devient une préoccupation pour les avionneurs. Il s’agit de maximiser la disponibilité des aéronefs tout en réduisant les couts directs d’exploitation sans compromis sur la sécurité des hommes et en respectant les contraintes environnementales. Une stratégie possible pour relever ce challenge est de renforcer la capacité à anticiper les défaillances afin de recourir à des actions préventives le plus juste possible sur les composants les plus critiques comme les roulements à billes. La mise en œuvre de processus de Prognostic Health Management (PHM) prend ainsi une part grandissante et le processus de pronostic est considéré comme l’un des principaux leviers d’action. Son déploiement requiert que le comportement du système étudié puisse être observés. Il peut ainsi bénéficier de l’apport des récentes avancées dans le domaine des microsystèmes autonomes en énergie permettant des mesures intelligentes et un transfert de données d’une manière distribuée, sans aucune aide externe. L’association de ses deux champs de recherche mène naturellement vers le roulement intelligent qui pourrait être la transition d’une maintenance programmée à une maintenance prédictive. Cependant les solutions de PHM autour du roulement et le roulement intelligent, ne restent pas moins le fruit de l’évolution des techniques et technologies de surveillance, de récupération d’énergie et de connectivité. C’est dans ce cadre que s’inscrit ce mémoire de thèse par Validation des Acquis de l’Expérience (VAE). Il s’articule en trois parties principales : motivations du VAE, état de l’art autour du roulement mécatronique et exemple de contributions autour de la récupération d’énergie et la communication sans fil à des fins de surveillance.
The aeronautic market is growing and the aircraft fleet size is becoming bigger. Maintenance optimization is a key focus for liner since objectives are to maximize the aircraft availability and to reduce the direct cost of ownership with no compromise on the flight security and safety with respect to environmental standards. To meet this challenge one possible strategy is to apply a PHM approach using the recent advance in the autonomous embedded microsystem field. This PhD work presents some work done around energy harvesting and wireless sensor to enable a smart bearing able to measure the usage and health data from the component in the purpose of predictive mainteance.
Advisors/Committee Members: Lebrun, Laurent (thesis director).
Subjects/Keywords: Phm; Roulement à billes; Roulement; Mécatronique; Contraintes mécaniques; Température; Lubrification; Capteur de température; Vibrations; Rfid; Récupération d'énergie; Phm; Ball bearing; Bearing; Mechatronics; Mechanical constraints; Temperature; Lubrication; Temperature sensor; Vibrations; Rfid; 629.107 2
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APA (6th Edition):
Hebrard, Y. (2018). PHM Autonome : Application au roulement intelligent : Autonomous PHM : Application to smart bearing. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2018LYSEI004
Chicago Manual of Style (16th Edition):
Hebrard, Yoann. “PHM Autonome : Application au roulement intelligent : Autonomous PHM : Application to smart bearing.” 2018. Doctoral Dissertation, Lyon. Accessed March 08, 2021.
http://www.theses.fr/2018LYSEI004.
MLA Handbook (7th Edition):
Hebrard, Yoann. “PHM Autonome : Application au roulement intelligent : Autonomous PHM : Application to smart bearing.” 2018. Web. 08 Mar 2021.
Vancouver:
Hebrard Y. PHM Autonome : Application au roulement intelligent : Autonomous PHM : Application to smart bearing. [Internet] [Doctoral dissertation]. Lyon; 2018. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2018LYSEI004.
Council of Science Editors:
Hebrard Y. PHM Autonome : Application au roulement intelligent : Autonomous PHM : Application to smart bearing. [Doctoral Dissertation]. Lyon; 2018. Available from: http://www.theses.fr/2018LYSEI004
21.
Purkayastha, Pratik.
Diagnostics and Prognostics of safety critical systems using machine learning, time and frequency domain analysis.
Degree: 2019, , Department of Applied Signal Processing
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17603
► The prime focus of this thesis was to develop a robust Prognostic and Diagnostic Health Management module (PDHM), capable of detecting faults, classifying faults,…
(more)
▼ The prime focus of this thesis was to develop a robust Prognostic and Diagnostic Health Management module (PDHM), capable of detecting faults, classifying faults, fault progression tracking and estimating time to failure. Priority was to obtain as much accuracy as possible with the bare minimum amount of sensors as possible. Algorithms like k-Nearest Neighbors (k-NN), Linear and Non- Linear regression and development of rule engine to identify safe operating limits were deployed. The entire solution was developed using R (v 3.5.0). The accuracy of around 98% was obtained in diagnostics. For Prognostics, our ability to predict time to failure more accurately increases with time. Some balance must be there between learning horizon and predicting horizon in order to get good predictions with reasonable time left to hit catastrophic failure. In conclusion, the PDHM module works just as desired and makes Predictive maintenance, smart replacement and crisis prediction possible ensuring the safety and security of people on board and assets.
Subjects/Keywords: Diagnostics; Prognostics; PHM; predictive maintenance; Signal Processing; Signalbehandling
…method can be broken down to 3 simple steps as shown in Figure 8 below.
Figure 8: PHM Method…
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APA (6th Edition):
Purkayastha, P. (2019). Diagnostics and Prognostics of safety critical systems using machine learning, time and frequency domain analysis. (Thesis). , Department of Applied Signal Processing. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17603
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Purkayastha, Pratik. “Diagnostics and Prognostics of safety critical systems using machine learning, time and frequency domain analysis.” 2019. Thesis, , Department of Applied Signal Processing. Accessed March 08, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17603.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Purkayastha, Pratik. “Diagnostics and Prognostics of safety critical systems using machine learning, time and frequency domain analysis.” 2019. Web. 08 Mar 2021.
Vancouver:
Purkayastha P. Diagnostics and Prognostics of safety critical systems using machine learning, time and frequency domain analysis. [Internet] [Thesis]. , Department of Applied Signal Processing; 2019. [cited 2021 Mar 08].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17603.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Purkayastha P. Diagnostics and Prognostics of safety critical systems using machine learning, time and frequency domain analysis. [Thesis]. , Department of Applied Signal Processing; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17603
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Maryland
22.
Yu, Alan.
PROGNOSTICS DEMONSTRATION OF ELECTRONIC COMPONENTS SUBJECTED TO VIBRATION ENVIRONMENT OF A LIGHT MILITARY TACTICAL VEHICLE.
Degree: Mechanical Engineering, 2007, University of Maryland
URL: http://hdl.handle.net/1903/7633
► A demonstration of the Prognostics and Health Management (PHM) method in a military vehicle environment was performed. The purpose of the demonstration is to show…
(more)
▼ A demonstration of the Prognostics and Health Management (
PHM) method in a military vehicle environment was performed. The purpose of the demonstration is to show rapid and cost effective means to increase reliability and effectiveness of in-cabin equipment through
PHM implementation. The
PHM method allows for prediction of damage accumulation in a system while in its operating environment. Prediction is achieved by monitoring and assessing appropriate product parameters.
An experimental setup to perform in-cabin accelerated testing on printed circuit boards (PCB) was developed. Strain, acceleration, continuity, and GPS data were recorded during testing. Using recorded data, life prediction with cycle counting and PSD load blocking techniques was demonstrated for BGA components. A limited set of terrain and loading conditions was characterized using Root Mean Square (RMS) and Power Spectral Density (PSD).
Advisors/Committee Members: Barker, Donald B (advisor).
Subjects/Keywords: Engineering, Mechanical; Engineering, Packaging; PHM; LCM; Military Vehicle; LMTV; HUMS; Prognostics demonstration
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APA (6th Edition):
Yu, A. (2007). PROGNOSTICS DEMONSTRATION OF ELECTRONIC COMPONENTS SUBJECTED TO VIBRATION ENVIRONMENT OF A LIGHT MILITARY TACTICAL VEHICLE. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/7633
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yu, Alan. “PROGNOSTICS DEMONSTRATION OF ELECTRONIC COMPONENTS SUBJECTED TO VIBRATION ENVIRONMENT OF A LIGHT MILITARY TACTICAL VEHICLE.” 2007. Thesis, University of Maryland. Accessed March 08, 2021.
http://hdl.handle.net/1903/7633.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yu, Alan. “PROGNOSTICS DEMONSTRATION OF ELECTRONIC COMPONENTS SUBJECTED TO VIBRATION ENVIRONMENT OF A LIGHT MILITARY TACTICAL VEHICLE.” 2007. Web. 08 Mar 2021.
Vancouver:
Yu A. PROGNOSTICS DEMONSTRATION OF ELECTRONIC COMPONENTS SUBJECTED TO VIBRATION ENVIRONMENT OF A LIGHT MILITARY TACTICAL VEHICLE. [Internet] [Thesis]. University of Maryland; 2007. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/1903/7633.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yu A. PROGNOSTICS DEMONSTRATION OF ELECTRONIC COMPONENTS SUBJECTED TO VIBRATION ENVIRONMENT OF A LIGHT MILITARY TACTICAL VEHICLE. [Thesis]. University of Maryland; 2007. Available from: http://hdl.handle.net/1903/7633
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
23.
Zhao, Wenyu.
A Probabilistic Approach for Prognostics of Complex Rotary
Machinery Systems.
Degree: PhD, Engineering and Applied Science: Mechanical
Engineering, 2015, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1423581651
► The growing demand for asset reliability and operation optimization has motivated the development of Prognostics and Health Management (PHM) methodologies and techniques, which facilitates data…
(more)
▼ The growing demand for asset reliability and operation
optimization has motivated the development of Prognostics and
Health Management (
PHM) methodologies and techniques, which
facilitates data analytics and enables diagnosis and prognosis of
machinery asset. Data-driven
PHM approaches mine available data to
derive condition indicators (CI) and subsequently health indicators
(HI), detect faults as data anomalies, identify faults based on
data classification, and predict faults based on trends and
trajectories in data. Machine learning and artificial intelligence
aid such data science by providing techniques that define
clustering models, generate classifiers and forecast future states,
as well as define thresholds and boundaries that aid
decision-making outcomes. Model-based
PHM approaches establish
physical models that are derived from first-principal knowledge
about the failure mechanism of interest, and simulate fault
signatures with high fidelity computation based on the model. There
is a growing trend to merge the complementary prognostics
methodologies, motivated by the rapid development of big data
infrastructure. The challenges associated with learning from large
amount of data with high dimension involve comprehending the
interdependencies between data variables and the complex physical
systems where data is collected from, as well as managing the
uncertainty that is underlying with the data due to modeling
uncertainty and measurement noise. In this dissertation, a Bayesian
theory based modeling and reasoning approach is developed, for
learning variable dependency in the form of conditional
probability. Two case studies are analyzed and discussed: one
addresses the issue of learning the dependency between system
operating regime and its performance outcome in a data-driven
environment; the other focuses on coupling physical model and
sensory measurement with an adaptive filtering approach, which is
capable of representing a non-linear system over discrete time
slices, sequentially filtering state estimation and predicting
remaining useful life of the system. Both case studies are
validated with data sets provided by industry partners, and are
benchmarked with previously developed and recognized techniques.
Finally, conclusions of this research are discussed and prospect
research direction is proposed as future work for interested
researchers.
Advisors/Committee Members: Lee, Jay (Committee Chair).
Subjects/Keywords: Mechanics; Prognostics; PHM; Bayesian Network; Wind Turbine; Jet Engine; Prediction
…necessity of Prognostics and Health Management (PHM) has been motivated
based on the… …development of PHM will be mutually inspired and enhanced with various
fields
besides
engineering… …which will provide inspiration and expertise to expand the vision
and techniques for PHM… …Recently, majority of
research effort has shifted towards PHM, which focuses on incipient failure… …the failure modes are well studied.
PHM is widely considered as an evolved methodology from…
Record Details
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APA ·
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APA (6th Edition):
Zhao, W. (2015). A Probabilistic Approach for Prognostics of Complex Rotary
Machinery Systems. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1423581651
Chicago Manual of Style (16th Edition):
Zhao, Wenyu. “A Probabilistic Approach for Prognostics of Complex Rotary
Machinery Systems.” 2015. Doctoral Dissertation, University of Cincinnati. Accessed March 08, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1423581651.
MLA Handbook (7th Edition):
Zhao, Wenyu. “A Probabilistic Approach for Prognostics of Complex Rotary
Machinery Systems.” 2015. Web. 08 Mar 2021.
Vancouver:
Zhao W. A Probabilistic Approach for Prognostics of Complex Rotary
Machinery Systems. [Internet] [Doctoral dissertation]. University of Cincinnati; 2015. [cited 2021 Mar 08].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1423581651.
Council of Science Editors:
Zhao W. A Probabilistic Approach for Prognostics of Complex Rotary
Machinery Systems. [Doctoral Dissertation]. University of Cincinnati; 2015. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1423581651
Université de Lorraine
24.
Shahin, Kamrul.
Modèle graphique probabiliste appliqué au diagnostic de l'état de santé des systèmes, au pronostic et à l'estimation de la durée de vie résiduelle : Dynamic Probabilistic Graphical Model applied to the system health diagnosis, prognosis, and the remains useful life estimation.
Degree: Docteur es, Automatique, Traitement du signal et des images, Génie informatique, 2020, Université de Lorraine
URL: http://www.theses.fr/2020LORR0129
► Cette thèse contribue au développement des recherches dans le domaine du Pronostic et Health Management : gestion de l’état de santé des systèmes complexes. Dans…
(more)
▼ Cette thèse contribue au développement des recherches dans le domaine du Pronostic et Health Management : gestion de l’état de santé des systèmes complexes. Dans un contexte de management opérationnel et de sûreté de fonctionnement des systèmes, nous proposons d’étudier comment la modélisation par un Modèle Graphique Probabiliste Dynamique (MGPD) permet le diagnostic de l’état de santé courant d’un système, le pronostic de cet état et de l’évolution des dégradations, ainsi que l’estimation de sa durée de vie résiduelle en fonction de ses conditions opérationnelles. La dégradation des composants est en général inconnue et nécessite un arrêt du système pour être observée. Cependant, cela est difficile, voire impossible, durant l’exploitation du système. Néanmoins, un ensemble de grandeurs observables sur le système ou le composant peut caractériser le niveau de dégradation et faciliter l’estimation de la durée de vie résiduelle du composant et du système. Les MGPD offrent une approche adaptée à la modélisation de l’évolution de l’état de santé des systèmes et des composants. Nous étendons la modélisation classique des modèles de la famille des HMM vers les IOHMM pour permettre une propagation temporelle de l’incertitude afin de résoudre le problème de pronostic de l’état de santé et de l’estimation de la durée de vie résiduelle. Cette recherche comprend l’extension des algorithmes d’apprentissage et d’inférence appliqués aussi bien dans le cas d’un composant que pour un système structuré. Cette thèse a pour but de contribuer à lever les verrous scientifiques suivants : - Considérer l'état de santé du système par un modèle stochastique et apprendre les paramètres du modèle à partir des mesures disponibles sur le système. - Établir un diagnostic de l’état de santé du système et le pronostic de son évolution en intégrant plusieurs conditions opérationnelles. - Estimer la durée de vie résiduelle des composants et des systèmes structurés (série, parallèle) à partir de ses composants. L’enjeu est majeur, car le pronostic de la dégradation des composants du système permet de définir des stratégies soit de pilotage soit de maintenance par rapport à la durée de vie résiduelle du système. Cela permet la réduction de la probabilité d’occurrence d’un arrêt pour cause de dysfonctionnement du système, soit en ajustant la vitesse de dégradation pour s’accorder à un plan de maintenance préventif, soit en planifiant les interventions de maintenance de manière proactive.
This thesis contributes to prognosis and health management for assessing health condition of complex systems. In the context of operational management and operational safety of systems, we propose to investigate how Dynamic Probabilistic Graphical Modelling (DPGM) can be used to diagnose the current health state of systems, prognostic the future health state, and the evolution of degradation, as well as estimate its remaining useful life based on its operating conditions. System degradation is generally unknown and requires shutting down the system to be observed.…
Advisors/Committee Members: Weber, Philippe (thesis director), Simon, Christophe (thesis director).
Subjects/Keywords: Évaluation de la santé; Diagnostic; Pronostic; RUL; Gestion des RUL; PHM; Conception de la dégradation; Condition de fonctionnement; Système complexe; Système structuré; Évaluation en ligne; Modèle de Markov caché entrée-sortie; Apprentissage des paramètres; Données manquantes; Health assessment; Diagnostic; Prognostic; RUL; RUL Management; PHM; Degradation design; Operating Condition; Complex system; Structured System; Online assessment; Input Output Hidden Markov Model; Parameter learning; Missing data; 620.004 52; 620.004 6
Record Details
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APA ·
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APA (6th Edition):
Shahin, K. (2020). Modèle graphique probabiliste appliqué au diagnostic de l'état de santé des systèmes, au pronostic et à l'estimation de la durée de vie résiduelle : Dynamic Probabilistic Graphical Model applied to the system health diagnosis, prognosis, and the remains useful life estimation. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2020LORR0129
Chicago Manual of Style (16th Edition):
Shahin, Kamrul. “Modèle graphique probabiliste appliqué au diagnostic de l'état de santé des systèmes, au pronostic et à l'estimation de la durée de vie résiduelle : Dynamic Probabilistic Graphical Model applied to the system health diagnosis, prognosis, and the remains useful life estimation.” 2020. Doctoral Dissertation, Université de Lorraine. Accessed March 08, 2021.
http://www.theses.fr/2020LORR0129.
MLA Handbook (7th Edition):
Shahin, Kamrul. “Modèle graphique probabiliste appliqué au diagnostic de l'état de santé des systèmes, au pronostic et à l'estimation de la durée de vie résiduelle : Dynamic Probabilistic Graphical Model applied to the system health diagnosis, prognosis, and the remains useful life estimation.” 2020. Web. 08 Mar 2021.
Vancouver:
Shahin K. Modèle graphique probabiliste appliqué au diagnostic de l'état de santé des systèmes, au pronostic et à l'estimation de la durée de vie résiduelle : Dynamic Probabilistic Graphical Model applied to the system health diagnosis, prognosis, and the remains useful life estimation. [Internet] [Doctoral dissertation]. Université de Lorraine; 2020. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2020LORR0129.
Council of Science Editors:
Shahin K. Modèle graphique probabiliste appliqué au diagnostic de l'état de santé des systèmes, au pronostic et à l'estimation de la durée de vie résiduelle : Dynamic Probabilistic Graphical Model applied to the system health diagnosis, prognosis, and the remains useful life estimation. [Doctoral Dissertation]. Université de Lorraine; 2020. Available from: http://www.theses.fr/2020LORR0129
25.
Acuña Ureta, David Esteban.
Manejo de incertidumbre ante pérdida parcial o total de datos en algoritmos basados en métodos secuenciales de Monte Carlo y nueva definición de probabilidad de falla en el contexto de monitoreo en línea.
Degree: 2016, Universidad de Chile
URL: http://repositorio.uchile.cl/handle/2250/139825
► Desde hace algunos años que la disciplina especializada en el diagnóstico de fallas en sistemas y el pronóstico de eventos que pudieran afectar la salud…
(more)
▼ Desde hace algunos años que la disciplina especializada en el diagnóstico de fallas en sistemas y el pronóstico de eventos que pudieran afectar la salud de éstos, denominada Prognostics and Health Management (PHM), ha ido tomando cada vez más fuerza y ha empezado a consolidarse como una nueva área de la ingeniería. Esta disciplina tiene como eje principal la caracterización del estado de salud de los sistemas dinámicos, ya sea a través de enfoques probabilísticos, posibilísticos, o epistémicos, por nombrar algunos; siendo el enfoque probabilístico el adoptado en la presente Tesis.
Dado que la mayoría de los sistemas se conciben mediante complejas relaciones que suelen establecerse en base a no linealidades e incertidumbre no necesariamente Gaussiana, el empleo de métodos secuenciales de Monte Carlo -también llamados filtros de partículas- ha tomado gran relevancia para el diagnóstico de la salud de los sistemas. Los filtros de partículas proveen una distribución empírica de probabilidad para los estados del sistema siguiendo un enfoque Bayesiano.
Es muy frecuente que en rutinas de estimación, y en especial al usar filtro de partículas, algunas de las mediciones que debiesen proporcionar los sensores se pierdan de manera parcial o total. En el caso de una pérdida parcial, se propone una estrategia basada en la Teoría de Imputaciones Múltiples desarrollada en los años 60' que permite incorporar la incertidumbre que hay al perder solo parte de la información. Por otra parte, cuando se pierde acceso a la totalidad de las mediciones se puede hablar de un problema análogo al de pronóstico. Se propone un algoritmo que recibe como entrada una distribución empírica producto del final de una etapa de estimación basada en filtro de partículas, en la cual se propaga incertidumbre haciendo uso de sigma-points y del ajuste paramétrico de mezclas de Gaussianas para la aproximación de distribuciones de probabilidad.
Además de los algoritmos anteriormente mencionados, en esta Tesis se presenta la deducción y demostración de una nueva medida de probabilidad de falla de sistemas en el contexto de monitoreo en línea, la cual modifica el estado-del-arte y abre nuevas ramas de investigación que pueden influir fuertemente en el desarrollo de nuevos sistemas de toma de decisiones.
Los desarrollos presentados en esta Tesis abordan principalmente el caso del problema de estimación y pronóstico del Estado-de-Carga de baterías de ion-litio para el análisis y validación de los algoritmos que se proponen dada su relevancia en la autonomía de los dispositivos electrónicos que requieren procesamiento de información en tiempo real; tales como tablets, celulares, vehículos o micro-redes, por nombrar algunos ejemplos.
Subjects/Keywords: Localización de fallas (Ingeniería); Método de Monte Carlo; Baterías ión-litio; PHM; Filtro de partículas
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APA ·
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to Zotero / EndNote / Reference
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APA (6th Edition):
Acuña Ureta, D. E. (2016). Manejo de incertidumbre ante pérdida parcial o total de datos en algoritmos basados en métodos secuenciales de Monte Carlo y nueva definición de probabilidad de falla en el contexto de monitoreo en línea. (Thesis). Universidad de Chile. Retrieved from http://repositorio.uchile.cl/handle/2250/139825
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Acuña Ureta, David Esteban. “Manejo de incertidumbre ante pérdida parcial o total de datos en algoritmos basados en métodos secuenciales de Monte Carlo y nueva definición de probabilidad de falla en el contexto de monitoreo en línea.” 2016. Thesis, Universidad de Chile. Accessed March 08, 2021.
http://repositorio.uchile.cl/handle/2250/139825.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Acuña Ureta, David Esteban. “Manejo de incertidumbre ante pérdida parcial o total de datos en algoritmos basados en métodos secuenciales de Monte Carlo y nueva definición de probabilidad de falla en el contexto de monitoreo en línea.” 2016. Web. 08 Mar 2021.
Vancouver:
Acuña Ureta DE. Manejo de incertidumbre ante pérdida parcial o total de datos en algoritmos basados en métodos secuenciales de Monte Carlo y nueva definición de probabilidad de falla en el contexto de monitoreo en línea. [Internet] [Thesis]. Universidad de Chile; 2016. [cited 2021 Mar 08].
Available from: http://repositorio.uchile.cl/handle/2250/139825.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Acuña Ureta DE. Manejo de incertidumbre ante pérdida parcial o total de datos en algoritmos basados en métodos secuenciales de Monte Carlo y nueva definición de probabilidad de falla en el contexto de monitoreo en línea. [Thesis]. Universidad de Chile; 2016. Available from: http://repositorio.uchile.cl/handle/2250/139825
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Grenoble
26.
Bouaziz, Mohammed Farouk.
Contribution à la modélisation Bayésienne de l'état de santé d'un système complexe : application à l'industrie du semi-conducteur : Towards Bayesian Network Methodology for Predicting the equipment Health Factor of Complex Semiconductor Systems.
Degree: Docteur es, Sciences et technologie industrielles, 2012, Université de Grenoble
URL: http://www.theses.fr/2012GRENT109
► Pour maintenir leur compétitivité, les industries du semi-conducteur doivent être en mesure de produire des circuits intégrés en technologies avancées, avec des temps de cycle…
(more)
▼ Pour maintenir leur compétitivité, les industries du semi-conducteur doivent être en mesure de produire des circuits intégrés en technologies avancées, avec des temps de cycle de plus en plus courts et à des coûts raisonnables. Un des axes d’amélioration réside dans le traitement des défaillances des équipements de production tenus responsables de plus de 50%des rejets produits. Cette thèse se fixe comme objectif de contribuer au développement d’une boucle réactive partant d’une dérive produit à la mise en place d’une solution appropriée tout en assurant un meilleur compromis entre disponibilité des équipements, coûts d’exploitation, qualité et compétitivité du produit. Joignant l’expertise humaine et les événements réels, nous nous sommes proposé ici de développer une méthodologie générique permettant de construire un modèle d’estimation du comportement des équipements de production (Equipment Health Factor EHF) à partir d’un raisonnement mathématique centré sur un formalisme probabiliste. L’approche a été amenée à sa validation expérimentale sur des outils, à base de réseaux Bayésiens, que nous avons développés. Les résultats obtenus amènent des éléments de décision permettant à l’industriel d’intervenir au plus tôt pour envisager par exemple de maintenir l’équipement avant qu’il n’ait dérivé. Cette thèse a été préparée dans le cadre du projet européen IMPROVE en collaboration avec STMicroelectronics, Lfoundry et Probayes
Today, the semiconductor industry must be able to produce Integrated Circuit (IC) withreduced cycle time, improved yield and enhanced equipment effectiveness. Besides thesechallenges IC manufacturers are required to address the products scrap and equipment driftsin a complex and uncertain environment which otherwise shall severely hamper the maximumproduction capacity planned. The objective of this thesis is to propose a generic methodologyto develop a model to predict the Equipment Health Factor (EHF) which will define decisionsupport strategies on maintenance tasks to increase the semiconductor industry performance.So, we are interested here to the problem of equipment failures and drift. We propose apredictive approach based on Bayesian technique allowing intervene early to maintain, forexample, the equipment before its drift. The study presented in this thesis is supported by theIMPROVE European project
Advisors/Committee Members: Zamaï, Eric (thesis director).
Subjects/Keywords: Maintenance prédictive; Pronostic et gestion de la santé; Réseaux bayésiens; Procédés semi-conducteurs complexes; Aide à la décision; Predictive maintenance (PdM); Prognostic and health management (PHM); Bayesian networks (BN); Complex semiconductor systems (SC); Decision support (DM)
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Manager
APA (6th Edition):
Bouaziz, M. F. (2012). Contribution à la modélisation Bayésienne de l'état de santé d'un système complexe : application à l'industrie du semi-conducteur : Towards Bayesian Network Methodology for Predicting the equipment Health Factor of Complex Semiconductor Systems. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2012GRENT109
Chicago Manual of Style (16th Edition):
Bouaziz, Mohammed Farouk. “Contribution à la modélisation Bayésienne de l'état de santé d'un système complexe : application à l'industrie du semi-conducteur : Towards Bayesian Network Methodology for Predicting the equipment Health Factor of Complex Semiconductor Systems.” 2012. Doctoral Dissertation, Université de Grenoble. Accessed March 08, 2021.
http://www.theses.fr/2012GRENT109.
MLA Handbook (7th Edition):
Bouaziz, Mohammed Farouk. “Contribution à la modélisation Bayésienne de l'état de santé d'un système complexe : application à l'industrie du semi-conducteur : Towards Bayesian Network Methodology for Predicting the equipment Health Factor of Complex Semiconductor Systems.” 2012. Web. 08 Mar 2021.
Vancouver:
Bouaziz MF. Contribution à la modélisation Bayésienne de l'état de santé d'un système complexe : application à l'industrie du semi-conducteur : Towards Bayesian Network Methodology for Predicting the equipment Health Factor of Complex Semiconductor Systems. [Internet] [Doctoral dissertation]. Université de Grenoble; 2012. [cited 2021 Mar 08].
Available from: http://www.theses.fr/2012GRENT109.
Council of Science Editors:
Bouaziz MF. Contribution à la modélisation Bayésienne de l'état de santé d'un système complexe : application à l'industrie du semi-conducteur : Towards Bayesian Network Methodology for Predicting the equipment Health Factor of Complex Semiconductor Systems. [Doctoral Dissertation]. Université de Grenoble; 2012. Available from: http://www.theses.fr/2012GRENT109
27.
Turski, Michelle Lynn.
Characterization of Drosophila Ctr1a: New Roles for Ctr1 Proteins and Copper in Physiology and Cell Signaling Pathways
.
Degree: 2008, Duke University
URL: http://hdl.handle.net/10161/888
► Copper is an essential trace element required by all aerobic organisms as a co-factor for enzymes involved in normal growth, development and physiology. Ctr1…
(more)
▼ Copper is an essential trace element required by all aerobic organisms as a co-factor for enzymes involved in normal growth, development and physiology. Ctr1 proteins are members of a highly conserved family of copper importers responsible for copper uptake across the plasma membrane. Mice lacking Ctr1 die during embryogenesis from widespread developmental defects, demonstrating the need for adequate copper acquisition in the development of metazoan organisms via as yet uncharacterized mechanisms. The early lethality of the Ctr1 knockout mouse has made it difficult to study the functions of copper and Ctr1 proteins in metazoan development and physiology. Drosophila melanogaster, a genetically tractable system expresses three Ctr1 genes, Ctr1A, Ctr1B and Ctr1C, and may help to further understand the roles of copper and Ctr1 proteins in metazoan development and physiology. Described here is the characterization of Drosophila Ctr1A. Localization studies using an affinity purified anti-Ctr1A peptide antibody show Ctr1A is predominantly expressed at the plasma membrane in whole embryos and in larval tissues. Ctr1A is an essential gene in Drosophila as loss-of-function mutants, generated by imprecise p-element excision arrest at early larval stages of development. Inductively coupled plasma mass spectroscopy (ICP-MS) demonstrated that whole body copper levels are reduced in Ctr1A mutants and consequently, a number of copper-dependent enzyme deficiencies were detected by in vitro enzyme and cell biological assays. Ctr1A maternal and zygotic mutants have a more severe developmental phenotype and also showed reductions in heart rate, which could be partially rescued by dietary copper supplementation. Heart-specific Ctr1A knockdown flies were subsequently examined for heart rate defects using optical coherence tomography (OCT) and while they did have reduced heart rate measurements, heart contractility was compromised.
While investigating tissue-specific requirements for Ctr1A in the development of Drosophila, a genetic interaction between Ctr1A and Ras was observed. Genetic experiments in Drosophila and cell culture experiments in both Drosophila and mammalian cell lines demonstrate a conserved role for Ctr1 proteins and copper as positive modulators of Ras/MAPK pathway signaling. Immunoblot analysis shows that signal transduction is intact until the point at which MEK1/2 phosphorylates ERK1/2. MEK2 protein levels are reduced in copper deficient cells, while MEK1 is able to bind copper-chelated beads, suggesting that these two proteins may be copper-binding proteins. In summary, this work demonstrates that Ctr1A is an essential gene in Drosophila and through characterization studies of Ctr1A, has uncovered conserved roles for Ctr1 proteins and copper in physiological processes and in an important signaling pathway that controls a number of fundamental biological processes.
Advisors/Committee Members: Thiele, Dennis J (advisor).
Subjects/Keywords: Biology, Genetics;
Biology, Molecular;
copper;
Ctr;
Drosophila;
Ras;
MAPK;
PHM;
Heart
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APA (6th Edition):
Turski, M. L. (2008). Characterization of Drosophila Ctr1a: New Roles for Ctr1 Proteins and Copper in Physiology and Cell Signaling Pathways
. (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/888
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Turski, Michelle Lynn. “Characterization of Drosophila Ctr1a: New Roles for Ctr1 Proteins and Copper in Physiology and Cell Signaling Pathways
.” 2008. Thesis, Duke University. Accessed March 08, 2021.
http://hdl.handle.net/10161/888.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Turski, Michelle Lynn. “Characterization of Drosophila Ctr1a: New Roles for Ctr1 Proteins and Copper in Physiology and Cell Signaling Pathways
.” 2008. Web. 08 Mar 2021.
Vancouver:
Turski ML. Characterization of Drosophila Ctr1a: New Roles for Ctr1 Proteins and Copper in Physiology and Cell Signaling Pathways
. [Internet] [Thesis]. Duke University; 2008. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/10161/888.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Turski ML. Characterization of Drosophila Ctr1a: New Roles for Ctr1 Proteins and Copper in Physiology and Cell Signaling Pathways
. [Thesis]. Duke University; 2008. Available from: http://hdl.handle.net/10161/888
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
28.
Zimmer, Aline Katharina.
Investigation of the impact of turbine blade geometry on near-field microwave blade tip time of arrival measurements.
Degree: MS, Aerospace Engineering, 2008, Georgia Tech
URL: http://hdl.handle.net/1853/26558
► This study investigates the manifestation of geometric features of turbine blades in signatures of non-optical time of arrival (ToA) probes. The approach enables an evaluation…
(more)
▼ This study investigates the manifestation of geometric features of turbine blades in signatures of non-optical time of arrival (ToA) probes. The approach enables an evaluation of the various signal characteristics used for defining ToA for a range of airfoil geometries and provides knowledge about additional waveform characteristics. The objective of this research is to increase the accuracy of microwave ToA probes by gaining a better understanding of the microwave signals in five steps. Firstly, ToA definitions used in the past are compared. Considering accuracy, computational effort, and versatility, the constant fraction crossing definition is found to be the most accurate. Secondly, an experimental apparatus capable of measuring airfoil ToA with microwave probes and optical probes as a reference is designed and built. As a third step, a catalog of 16 turbine blade geometries is developed. Fourthly, the signatures of these turbine blades are acquired using both the optical and the microwave probes. Finally, the impact of the geometric effects on the signatures is evaluated. The quality of the microwave results is found to be highly dependent on the polarization of the microwaves. Analysis of the time domain signal shows that decreasing the blade width, increasing the chord angle, or incorporating a blade tip pocket or a varying cross-section leads to a decrease in the amplitude of the peak caused by the blade. Increasing the blade width and incorporating a chord angle leads to an increase in peak width. A frequency domain analysis is conducted on the microwave signals and verified using a synthetic signal. This analysis confirms the findings from the time domain analysis. The time domain analysis of the laser measurements shows that the spatial resolution of the laser is much higher than that of the microwave sensor. Consequently, the signal acquired with the optical setup provides a good means of defining the blade ToA. The knowledge gained in this study about the sensor and its interaction with passing blade tips of varying geometry can be used to enhance the understanding of microwave ToA measurements. This knowledge provides further insight into airfoil and engine health.
Advisors/Committee Members: Jagoda, Jechiel (Committee Chair), Jacobs, Laurence (Committee Co-Chair), Seitzman, Jerry (Committee Member).
Subjects/Keywords: Phm; Nsms; Turbine blade; Time of arrival; Microwave sensor; Blades; Microwave measurements; Aerofoils; Microwaves
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APA (6th Edition):
Zimmer, A. K. (2008). Investigation of the impact of turbine blade geometry on near-field microwave blade tip time of arrival measurements. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/26558
Chicago Manual of Style (16th Edition):
Zimmer, Aline Katharina. “Investigation of the impact of turbine blade geometry on near-field microwave blade tip time of arrival measurements.” 2008. Masters Thesis, Georgia Tech. Accessed March 08, 2021.
http://hdl.handle.net/1853/26558.
MLA Handbook (7th Edition):
Zimmer, Aline Katharina. “Investigation of the impact of turbine blade geometry on near-field microwave blade tip time of arrival measurements.” 2008. Web. 08 Mar 2021.
Vancouver:
Zimmer AK. Investigation of the impact of turbine blade geometry on near-field microwave blade tip time of arrival measurements. [Internet] [Masters thesis]. Georgia Tech; 2008. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/1853/26558.
Council of Science Editors:
Zimmer AK. Investigation of the impact of turbine blade geometry on near-field microwave blade tip time of arrival measurements. [Masters Thesis]. Georgia Tech; 2008. Available from: http://hdl.handle.net/1853/26558
De Montfort University
29.
Mittelstadt, Brent.
On the ethical implications of personal health monitoring.
Degree: PhD, 2013, De Montfort University
URL: http://hdl.handle.net/2086/10101
► Recent years have seen an influx of medical technologies capable of remotely monitoring the health and behaviours of individuals to detect, manage and prevent health…
(more)
▼ Recent years have seen an influx of medical technologies capable of remotely monitoring the health and behaviours of individuals to detect, manage and prevent health problems. Known collectively as personal health monitoring (PHM), these systems are intended to supplement medical care with health monitoring outside traditional care environments such as hospitals, ranging in complexity from mobile devices to complex networks of sensors measuring physiological parameters and behaviours. This research project assesses the potential ethical implications of PHM as an emerging medical technology, amenable to anticipatory action intended to prevent or mitigate problematic ethical issues in the future. PHM fundamentally changes how medical care can be delivered: patients can be monitored and consulted at a distance, eliminating opportunities for face-to-face actions and potentially undermining the importance of social, emotional and psychological aspects of medical care. The norms evident in this movement may clash with existing standards of 'good' medical practice from the perspective of patients, clinicians and institutions. By relating utilitarianism, virtue ethics and theories of surveillance to Habermas' concept of colonisation of the lifeworld, a conceptual framework is created which can explain how PHM may be allowed to change medicine as a practice in an ethically problematic way. The framework relates the inhibition of virtuous behaviour among practitioners of medicine, understood as a moral practice, to the movement in medicine towards remote monitoring. To assess the explanatory power of the conceptual framework and expand its borders, a qualitative interview empirical study with potential users of PHM in England is carried out. Recognising that the inherent uncertainty of the future undermines the validity of empirical research, a novel epistemological framework based in Habermas' discourse ethics is created to justify the empirical study. By developing Habermas' concept of translation into a procedure for assessing the credibility of uncertain normative claims about the future, a novel methodology for empirical ethical assessment of emerging technologies is created and tested. Various methods of analysis are employed, including review of academic discourses, empirical and theoretical analyses of the moral potential of PHM. Recommendations are made concerning ethical issues in the deployment and design of PHM systems, analysis and application of PHM data, and the shortcomings of existing research and protection mechanisms in responding to potential ethical implications of the technology.
Subjects/Keywords: 004; personal health monitoring; ethics; applied ethics; bioethics; ubiquitous computing; wearable computing; virtue ethics; computer ethics; habermas; surveillance; telehealth; telecare; telemedicine; pervasive computing; medical ethics; ambient intelligence; pervasive health; social sorting; lyon; macintyre; lifeworld; discourse ethics; phm; ambient assisted living; ehealth; biometrics
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APA (6th Edition):
Mittelstadt, B. (2013). On the ethical implications of personal health monitoring. (Doctoral Dissertation). De Montfort University. Retrieved from http://hdl.handle.net/2086/10101
Chicago Manual of Style (16th Edition):
Mittelstadt, Brent. “On the ethical implications of personal health monitoring.” 2013. Doctoral Dissertation, De Montfort University. Accessed March 08, 2021.
http://hdl.handle.net/2086/10101.
MLA Handbook (7th Edition):
Mittelstadt, Brent. “On the ethical implications of personal health monitoring.” 2013. Web. 08 Mar 2021.
Vancouver:
Mittelstadt B. On the ethical implications of personal health monitoring. [Internet] [Doctoral dissertation]. De Montfort University; 2013. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/2086/10101.
Council of Science Editors:
Mittelstadt B. On the ethical implications of personal health monitoring. [Doctoral Dissertation]. De Montfort University; 2013. Available from: http://hdl.handle.net/2086/10101
30.
Brown, Douglas W.
A prognostic health management based framework for fault-tolerant control.
Degree: PhD, Electrical and Computer Engineering, 2011, Georgia Tech
URL: http://hdl.handle.net/1853/41132
► The emergence of complex and autonomous systems, such as modern aircraft, unmanned aerial vehicles (UAVs) and automated industrial processes is driving the development and implementation…
(more)
▼ The emergence of complex and autonomous systems, such as modern aircraft, unmanned aerial vehicles (UAVs) and automated industrial processes is driving the development and implementation of new control technologies aimed at accommodating incipient failures to maintain system operation during an emergency. The motivation for this research began in the area of avionics and flight control systems for the purpose to improve aircraft safety. A prognostics health management (
PHM) based fault-tolerant control architecture can increase safety and reliability by detecting and accommodating impending failures thereby minimizing the occurrence of unexpected, costly and possibly life-threatening mission failures; reduce unnecessary maintenance actions; and extend system availability / reliability.
Recent developments in failure prognosis and fault tolerant control (FTC) provide a basis for a prognosis based reconfigurable control framework. Key work in this area considers: (1) long-term lifetime predictions as a design constraint using optimal control; (2) the use of model predictive control to retrofit existing controllers with real-time fault detection and diagnosis routines; (3) hybrid hierarchical approaches to FTC taking advantage of control reconfiguration at multiple levels, or layers, enabling the possibility of set-point reconfiguration, system restructuring and path / mission re-planning. Combining these control elements in a hierarchical structure allows for the development of a comprehensive framework for prognosis based FTC.
First, the
PHM-based reconfigurable controls framework presented in this thesis is given as one approach to a much larger hierarchical control scheme. This begins with a brief overview of a much broader three-tier hierarchical control architecture defined as having three layers: supervisory, intermediate, and low-level. The supervisory layer manages high-level objectives. The intermediate layer redistributes component loads among multiple sub-systems. The low-level layer reconfigures the set-points used by the local production controller thereby trading-off system performance for an increase in remaining useful life (RUL).
Next, a low-level reconfigurable controller is defined as a time-varying multi-objective criterion function and appropriate constraints to determine optimal set-point reconfiguration. A set of necessary conditions are established to ensure the stability and boundedness of the composite system. In addition, the error bounds corresponding to long-term state-space prediction are examined. From these error bounds, the point estimate and corresponding uncertainty boundaries for the RUL estimate can be obtained. Also, the computational efficiency of the controller is examined by using the number of average floating point operations per iteration as a standard metric of comparison.
Finally, results are obtained for an avionics grade triplex-redundant electro-mechanical actuator with a specific fault mode; insulation breakdown between winding turns in a brushless DC motor…
Advisors/Committee Members: Vachtsevanos, George (Committee Chair), Michaels, Jennifer (Committee Member), Roemer, Michael (Committee Member), Taylor, David (Committee Member), Wills, Linda (Committee Member).
Subjects/Keywords: Diagnosis; Prognosis; Fault-tolerant control; Reconfigurable control; PHM; System failures (Engineering); Fault location (Engineering); Fault tolerance (Engineering); Reliability (Engineering)
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Brown, D. W. (2011). A prognostic health management based framework for fault-tolerant control. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/41132
Chicago Manual of Style (16th Edition):
Brown, Douglas W. “A prognostic health management based framework for fault-tolerant control.” 2011. Doctoral Dissertation, Georgia Tech. Accessed March 08, 2021.
http://hdl.handle.net/1853/41132.
MLA Handbook (7th Edition):
Brown, Douglas W. “A prognostic health management based framework for fault-tolerant control.” 2011. Web. 08 Mar 2021.
Vancouver:
Brown DW. A prognostic health management based framework for fault-tolerant control. [Internet] [Doctoral dissertation]. Georgia Tech; 2011. [cited 2021 Mar 08].
Available from: http://hdl.handle.net/1853/41132.
Council of Science Editors:
Brown DW. A prognostic health management based framework for fault-tolerant control. [Doctoral Dissertation]. Georgia Tech; 2011. Available from: http://hdl.handle.net/1853/41132
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Open Access Theses and Dissertations
