subject:(Lumped model multi physical)

1. Bracikowski, Nicolas. Modélisation multi-physique par modèles à constantes localisées ; application à une machine synchrone à aimants permanents en vue de son dimensionnement. : Multi-Physical modelling lumped models; application to a synchronous machine with permanent magnets for the sizing.

Degree: Docteur es, Génie Electrique, 2012, Ecole centrale de Lille

URL: http://www.theses.fr/2012ECLI0028

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Afin de définir une conception optimale d’un système électromécanique, celui-ci doit intégrer des contraintes toujours plus drastiques et de nombreux phénomènes physiques issus de :… (more)

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Afin de définir une conception optimale d’un système électromécanique, celui-ci doit intégrer des contraintes toujours plus drastiques et de nombreux phénomènes physiques issus de : l’électromagnétique, l’aérothermique, l’électronique, la mécanique et l’acoustique. L’originalité de cette thèse est de proposer une modélisation multi-physique pour la conception reposant sur des modèles à constantes localisées : solution intermédiaire entre la modélisation analytique et numérique. Ces différents modèles permettront l’étude et la conception sous contraintes d’une machine synchrone à aimants permanents dédiée pour la traction ferroviaire. Les résultats de simulations seront comparés à des résultats éléments finis mais aussi à des essais expérimentaux. Ce modèle multi-physique est entièrement paramétré afin d’être associé à des outils d’optimisation. On utilisera ici une optimisation par essaim de particules pour chercher des compromis entre différents objectifs sous forme de Front de Pareto. Dans ce papier, nous ciblerons les objectifs suivants : le couple d’origine électromagnétique et le bruit d’origine électromagnétique. Finalement une étude de sensibilité valide la robustesse de la conception retenue quand celle-ci est soumise aux contraintes de fabrication. L’objectif étant de poser les bases d’un outil d’aide à la décision pour le choix d’une machine électrique

In order to perform an optimal design of electromechanical system, the designer must take into account ever more stringent constraints and many physical phenomena from electric, magnetic, aeraulic, thermic, electronic, mechanic and acoustic. The originality of this thesis is to put forward a multi-physic design based on lumped models: halfway between analytical and numerical modeling. These models allow sizing a permanent magnet synchronous machine under constraints for rail traction. The results are validated with finite element simulations and experimental analysis. The multi-physic modeling is fully automated, parameterized, in order to combine the model with the optimization tool. We used here particle swarm optimization to search compromises between several objectives (Pareto Front). In this paper, we focus on electromagnetic torque and electromagnetic noise. Finally a sensitive study validates the robustness of selected design when it is subjected to manufacturing constraints. The aim of this work is to propose a decision tool to size electrical machines

Advisors/Committee Members: Hecquet, Michel (thesis director), Brochet, Pascal (thesis director).

Subjects/Keywords: Machine synchrone à aimants en surface; Modèle à constantes localisées; Modèle multi-physique; Bruit d’origine électromagnétique; Couple d’origine électromagnétique; Optimisation multi-objectif; Algorithme par essaim de particules; Etudes de sensibilité; Magnet synchronous machine surface model; Lumped model multi-physical; Multi-physical model; Electromagnetic noise; Electromagnetic torque; Multi-objective optimization; Particle swarm algorithm; Sensitive studies

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bracikowski, N. (2012). Modélisation multi-physique par modèles à constantes localisées ; application à une machine synchrone à aimants permanents en vue de son dimensionnement. : Multi-Physical modelling lumped models; application to a synchronous machine with permanent magnets for the sizing. (Doctoral Dissertation). Ecole centrale de Lille. Retrieved from http://www.theses.fr/2012ECLI0028

Chicago Manual of Style (16^th Edition):

Bracikowski, Nicolas. “Modélisation multi-physique par modèles à constantes localisées ; application à une machine synchrone à aimants permanents en vue de son dimensionnement. : Multi-Physical modelling lumped models; application to a synchronous machine with permanent magnets for the sizing.” 2012. Doctoral Dissertation, Ecole centrale de Lille. Accessed January 22, 2021. http://www.theses.fr/2012ECLI0028.

MLA Handbook (7^th Edition):

Bracikowski, Nicolas. “Modélisation multi-physique par modèles à constantes localisées ; application à une machine synchrone à aimants permanents en vue de son dimensionnement. : Multi-Physical modelling lumped models; application to a synchronous machine with permanent magnets for the sizing.” 2012. Web. 22 Jan 2021.

Vancouver:

Bracikowski N. Modélisation multi-physique par modèles à constantes localisées ; application à une machine synchrone à aimants permanents en vue de son dimensionnement. : Multi-Physical modelling lumped models; application to a synchronous machine with permanent magnets for the sizing. [Internet] [Doctoral dissertation]. Ecole centrale de Lille; 2012. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2012ECLI0028.

Council of Science Editors:

Bracikowski N. Modélisation multi-physique par modèles à constantes localisées ; application à une machine synchrone à aimants permanents en vue de son dimensionnement. : Multi-Physical modelling lumped models; application to a synchronous machine with permanent magnets for the sizing. [Doctoral Dissertation]. Ecole centrale de Lille; 2012. Available from: http://www.theses.fr/2012ECLI0028

Indian Institute of Science

2. Joshi, Divyanshu. Analysis of Vehicle Dynamics and Control of Occupant Biodynamics using a Novel Multi-Occupant Vehicle Model.

Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/3759

► Due to the detrimental effects of ride vibrations on occupants and increasing safety concerns, improvement in vehicle dynamic characteristics has become a key focus of… (more)

▼ Due to the detrimental effects of ride vibrations on occupants and increasing safety concerns, improvement in vehicle dynamic characteristics has become a key focus of researchers. Typically, ride and handling problems have been dealt with independently. There is a dearth of vehicle models capable of capturing occupant biodynamics and its implication on vehicle ride and handling. Also in general, the objective of conventional control systems has been to attenuate vertical dynamic response of the sprung mass of a vehicle. Feedback control based algorithms are predominantly used in active/semi-active suspensions that ignore the biodynamics of occupants. In the current work, a new 50 degree-of-freedom (DOF) combined nonlinear multi-occupant vehicle model is developed using the lumped parameter modelling (LPM) approach. The current model provides a platform for performing a combined study of ride, handling and occupant biodynamics. The model is capable of simulating the combined effect of sitting occupancies, road inputs and driving maneuvers on biodynamic responses. It is analyzed using MATLAB/SIMULINK functionalities and validated by independently correlating the computed responses with existing experimental results. A study is performed on ride behavior of a vehicle-occupant system under two different transient road inputs. In addition, the effect of road roughness on vehicle ride is also studied. Random road profiles are generated from road roughness spectrum given in the ISO 8608:1995 manual. Insights are developed into the ride dynamics of a vehicle traversing over roads of classes A, B, C and D at given test velocities. The effect of sitting occupancies and vehicle velocities on lateral dynamics is also studied. Results underscore the need for considering sitting occupancies while analyzing vehicle dynamics and also highlight the potential of the current model. Furthermore, a Moore-Penrose Pseudoinverse based feed-forward controller is developed and implemented in an independently acting semi-active seat suspension system. Feasibility of feed-forward control in primary suspensions is also investigated. Finally, issues of stability, performance and limitation of the controller are discussed. Advisors/Committee Members: Deb, Anindya (advisor).

Subjects/Keywords: Vehicle Dynamic Analysis; Occupant Biodynamics - Control; Novel Multi Occupant Vehicle Model; Lumped Parameter Modeling; Skyhook Control Policy; Multi-Occupant Vehicle; Multi-Occupant Ride Comfort; Road Roughness Modeling; Ride Comfort Assessment; Lumped Parameter Analysis; Product Design and Manufacturing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Joshi, D. (2018). Analysis of Vehicle Dynamics and Control of Occupant Biodynamics using a Novel Multi-Occupant Vehicle Model. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3759

Chicago Manual of Style (16^th Edition):

Joshi, Divyanshu. “Analysis of Vehicle Dynamics and Control of Occupant Biodynamics using a Novel Multi-Occupant Vehicle Model.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed January 22, 2021. http://etd.iisc.ac.in/handle/2005/3759.

MLA Handbook (7^th Edition):

Joshi, Divyanshu. “Analysis of Vehicle Dynamics and Control of Occupant Biodynamics using a Novel Multi-Occupant Vehicle Model.” 2018. Web. 22 Jan 2021.

Vancouver:

Joshi D. Analysis of Vehicle Dynamics and Control of Occupant Biodynamics using a Novel Multi-Occupant Vehicle Model. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Jan 22]. Available from: http://etd.iisc.ac.in/handle/2005/3759.

Council of Science Editors:

Joshi D. Analysis of Vehicle Dynamics and Control of Occupant Biodynamics using a Novel Multi-Occupant Vehicle Model. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3759

Penn State University

3. Mitchell, Eric Carl. A Lumped Element Model For An Inline Thermoacoustic Chiller.

Degree: 2012, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/16068

► Thermoacoustics is a growing field in today's scientific society. It is possible that legislation and regulation may phase out conventional refrigeration systems due to the… (more)

▼ Thermoacoustics is a growing field in today's scientific society. It is possible that legislation and regulation may phase out conventional refrigeration systems due to the global warming potential of the working fluids. Thermoacoustic refrigeration does not rely on these potentially harmful gases, and is therefore a potential successor. The inline topology is a new topology for a thermoacoustic refrigerator. This topology consists of parts that would be found in most thermoacoustic devices, such as heat exchangers, regenerators, pistons, drivers, and ducts. What makes this new topology unique is that the inline topology consists of N identical segments. Each of the drivers are phased 360/N degrees from one another. Like many other thermoacoustic devices the inline topology is a complicated system, and there are few tools that can be employed in the design of these systems. A model based on lumped element theory will be developed to assist in the design of an inline thermoacoustic refrigerator. The inline topology that will be modeled consists of three sections (each phased 120 degrees from one another) titled Trillium. Due to the repetitive sections in Trillium, a model will be created for one section and be constrained so the effect of the rest of the system can influence the single section. The lumped element model must be simple and accurate so that it can aid in the design process of these devices. For the lumped element model to be useful, it must agree with the more complex models such as DELTA EC. After comparisons and validations, it was determined that the lumped element model is accurate enough to facilitate thermoacoustic refrigerator design. It was also determined that the model is much easier to run, and allows the designer to explore system trends as a function of the system parameters. Another benefit to a lumped element model is that the model is simple enough to add, remove, and change system components. A system that is oscillating at 60 Hz will reach over five million cycles in one day, therefore the refrigerator must be designed for an infinite number of cycles. One of the most fatigue-prone parts of a thermoacoustic device is the flexure seal. A series spring was added into the model, between the driver and the flexure seal, to investigate its effects on reducing the required displacement of the flexure seal while still matching the driver to the optimal system impedance. Advisors/Committee Members: Steven Lurie Garrett, Thesis Advisor/Co-Advisor, Robert Mitchel Keolian, Thesis Advisor/Co-Advisor, Robert William Smith, Thesis Advisor/Co-Advisor, Matthew Ernest Poese, Thesis Advisor/Co-Advisor, Victor Ward Sparrow, Thesis Advisor/Co-Advisor.

Subjects/Keywords: thermoacoustic; acoustic; regenerator; lumped element model; refrigerator

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mitchell, E. C. (2012). A Lumped Element Model For An Inline Thermoacoustic Chiller. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16068

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mitchell, Eric Carl. “A Lumped Element Model For An Inline Thermoacoustic Chiller.” 2012. Thesis, Penn State University. Accessed January 22, 2021. https://submit-etda.libraries.psu.edu/catalog/16068.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mitchell, Eric Carl. “A Lumped Element Model For An Inline Thermoacoustic Chiller.” 2012. Web. 22 Jan 2021.

Vancouver:

Mitchell EC. A Lumped Element Model For An Inline Thermoacoustic Chiller. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Jan 22]. Available from: https://submit-etda.libraries.psu.edu/catalog/16068.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mitchell EC. A Lumped Element Model For An Inline Thermoacoustic Chiller. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/16068

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Bath

4. Margetts, Rebecca. Modelling & analysis of hybrid dynamic systems using a bond graph approach.

Degree: PhD, 2013, University of Bath

URL: https://researchportal.bath.ac.uk/en/studentthesis/modelling – analysis-of-hybrid-dynamic-systems-using-a-bond-graph-approach(5e538b1c-d12f-43ff-8247-7d9123c56036).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600647

► Hybrid models are those containing continuous and discontinuous behaviour. In constructing dynamic systems models, it is frequently desirable to abstract rapidly changing, highly nonlinear behaviour… (more)

▼ Hybrid models are those containing continuous and discontinuous behaviour. In constructing dynamic systems models, it is frequently desirable to abstract rapidly changing, highly nonlinear behaviour to a discontinuity. Bond graphs lend themselves to systems modelling by being multi-disciplinary and reflecting the physics of the system. One advantage is that they can produce a mathematical model in a form that simulates quickly and efficiently. Hybrid bond graphs are a logical development which could further improve speed and efficiency. A range of hybrid bond graph forms have been proposed which are suitable for either simulation or further analysis, but not both. None have reached common usage. A Hybrid bond graph method is proposed here which is suitable for simulation as well as providing engineering insight through analysis. This new method features a distinction between structural and parametric switching. The controlled junction is used for the former, and gives rise to dynamic causality. A controlled element is developed for the latter. Dynamic causality is unconstrained so as to aid insight, and a new notation is proposed. The junction structure matrix for the hybrid bond graph features Boolean terms to reflect the controlled junctions in the graph structure. This hybrid JSM is used to generate a mixed-Boolean state equation. When storage elements are in dynamic causality, the resulting system equation is implicit. The focus of this thesis is the exploitation of the model. The implicit form enables application of matrix-rank criteria from control theory, and control properties can be seen in the structure and causal assignment. An impulsive mode may occur when storage elements are in dynamic causality, but otherwise there are no energy losses associated with commutation because this method dictates the way discontinuities are abstracted. The main contribution is therefore a Hybrid Bond Graph which reflects the physics of commutating systems and offers engineering insight through the choice of controlled elements and dynamic causality. It generates a unique, implicit, mixed-Boolean system equation, describing all modes of operation. This form is suitable for both simulation and analysis.

Subjects/Keywords: 620.0011; hybrid; bond graph; physical; model; dynamic; aircraft; switch; mechatronic; multi-disciplinary; multi-physis

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APA (6^th Edition):

Margetts, R. (2013). Modelling & analysis of hybrid dynamic systems using a bond graph approach. (Doctoral Dissertation). University of Bath. Retrieved from https://researchportal.bath.ac.uk/en/studentthesis/modelling – analysis-of-hybrid-dynamic-systems-using-a-bond-graph-approach(5e538b1c-d12f-43ff-8247-7d9123c56036).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600647

Chicago Manual of Style (16^th Edition):

Margetts, Rebecca. “Modelling & analysis of hybrid dynamic systems using a bond graph approach.” 2013. Doctoral Dissertation, University of Bath. Accessed January 22, 2021. https://researchportal.bath.ac.uk/en/studentthesis/modelling – analysis-of-hybrid-dynamic-systems-using-a-bond-graph-approach(5e538b1c-d12f-43ff-8247-7d9123c56036).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600647.

MLA Handbook (7^th Edition):

Margetts, Rebecca. “Modelling & analysis of hybrid dynamic systems using a bond graph approach.” 2013. Web. 22 Jan 2021.

Vancouver:

Margetts R. Modelling & analysis of hybrid dynamic systems using a bond graph approach. [Internet] [Doctoral dissertation]. University of Bath; 2013. [cited 2021 Jan 22]. Available from: https://researchportal.bath.ac.uk/en/studentthesis/modelling – analysis-of-hybrid-dynamic-systems-using-a-bond-graph-approach(5e538b1c-d12f-43ff-8247-7d9123c56036).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600647.

Council of Science Editors:

Margetts R. Modelling & analysis of hybrid dynamic systems using a bond graph approach. [Doctoral Dissertation]. University of Bath; 2013. Available from: https://researchportal.bath.ac.uk/en/studentthesis/modelling – analysis-of-hybrid-dynamic-systems-using-a-bond-graph-approach(5e538b1c-d12f-43ff-8247-7d9123c56036).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600647

Loughborough University

5. Bumberger, Roman. Subject-adjustable computational modelling for the analysis of human head-neck motions in rear-end impacts.

Degree: PhD, 2019, Loughborough University

URL: https://doi.org/10.26174/thesis.lboro.10004210.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791110

► Whiplash Associated Disorder (WAD) is a general term used to describe minor injuries to the neck, mostly as a result of a rear-end motor vehicle… (more)

▼ Whiplash Associated Disorder (WAD) is a general term used to describe minor injuries to the neck, mostly as a result of a rear-end motor vehicle collision. Although the injury is defined as minor, the long-term symptoms such as neck pain, stiffness, headache, or concentration difficulties, result in high costs to the economy, healthcare services and individuals. Consequently, there has been significant amount of research undertaken to understand and prevent WAD, covering experimental and computational studies. However, whiplash injuries are difficult to detect since diagnostic tools such as X-rays, CT (Computed Tomography) scans or MRI (Magnetic Resonance Imaging) are not suitable to identify the location or the extent of the injury. Also, the injury mechanisms are not fully understood; hence mathematical criteria are used as surrogates to estimate the likelihood of injury. In the present research, a biofidelic, subject-adjustable head-and-neck model (i.e. the model is adjustable for individual subject characteristics) has been developed for rear-end impact whiplash analysis. Existing literature is used to develop the overall research framework (methodology), which has three main objectives: first to explain the importance of personalised protection investigations, second to evaluate the suitability of existing data for a subject-adjustable model, and third to define the required steps in the design of such a model. To generate the geometry of the model, previously published cascading equations capable of predicting the main vertebrae dimensions based on the subject characteristics age, gender and height are used. Also, in line with previous work, seven cervical neck segments represent the seven cervical vertebrae and all surrounding cervical tissues properties. The mass and moment of inertia properties of each segment are lumped into each respective segment. The intervertebral behaviour for two adjacent segments is described by non-linear spring-damper functions, which change according to subject specific characteristics. The model is driven by specification of the first thoracic vertebra (T1) motion. The model combines existing data and methods from different sources, utilising available data in the public domain. New procedures and techniques are incorporated to create a homogeneous model, which is adaptable to a wide range of subjects. The developed computational model is not simply a linear scaling of a master-model to other dimensions, but rather uses prediction equations to create the desired anthropometric model. The anthropometric model predictions for body part dimensions and inertia properties are successfully verified using anthropometric surveys available in the literature. Using lumped and non-linear stiffness and damping equations for the intervertebral joints, and without modelling separate muscles, the model is dynamically calibrated for different experimental sled test data available in the open domain. The joint equations and their coefficients are derived based on published joint data measurements…

Subjects/Keywords: Subject-Adjustable; Whiplash; Lumped-parameter; Computational; Multi-body; Modelling; Viscoelastic; WAD

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APA (6^th Edition):

Bumberger, R. (2019). Subject-adjustable computational modelling for the analysis of human head-neck motions in rear-end impacts. (Doctoral Dissertation). Loughborough University. Retrieved from https://doi.org/10.26174/thesis.lboro.10004210.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791110

Chicago Manual of Style (16^th Edition):

Bumberger, Roman. “Subject-adjustable computational modelling for the analysis of human head-neck motions in rear-end impacts.” 2019. Doctoral Dissertation, Loughborough University. Accessed January 22, 2021. https://doi.org/10.26174/thesis.lboro.10004210.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791110.

MLA Handbook (7^th Edition):

Bumberger, Roman. “Subject-adjustable computational modelling for the analysis of human head-neck motions in rear-end impacts.” 2019. Web. 22 Jan 2021.

Vancouver:

Bumberger R. Subject-adjustable computational modelling for the analysis of human head-neck motions in rear-end impacts. [Internet] [Doctoral dissertation]. Loughborough University; 2019. [cited 2021 Jan 22]. Available from: https://doi.org/10.26174/thesis.lboro.10004210.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791110.

Council of Science Editors:

Bumberger R. Subject-adjustable computational modelling for the analysis of human head-neck motions in rear-end impacts. [Doctoral Dissertation]. Loughborough University; 2019. Available from: https://doi.org/10.26174/thesis.lboro.10004210.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791110

KTH

6. Tondu, Yohann. Simulation of the Paris 1910 flood with a lumped hydrological model: the influence of frozen soil.

Degree: Hydraulic Engineering, 2011, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96310

► In 1910, Paris experienced its biggest flood in the 20th century. In 2010, for the anniversary of this event – supposed to happen every… (more)

Subjects/Keywords: Paris 1910 flood; Lumped hydrological model; Rainfall-Runoff model; Frost

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tondu, Y. (2011). Simulation of the Paris 1910 flood with a lumped hydrological model: the influence of frozen soil. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96310

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tondu, Yohann. “Simulation of the Paris 1910 flood with a lumped hydrological model: the influence of frozen soil.” 2011. Thesis, KTH. Accessed January 22, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96310.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tondu, Yohann. “Simulation of the Paris 1910 flood with a lumped hydrological model: the influence of frozen soil.” 2011. Web. 22 Jan 2021.

Vancouver:

Tondu Y. Simulation of the Paris 1910 flood with a lumped hydrological model: the influence of frozen soil. [Internet] [Thesis]. KTH; 2011. [cited 2021 Jan 22]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96310.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tondu Y. Simulation of the Paris 1910 flood with a lumped hydrological model: the influence of frozen soil. [Thesis]. KTH; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96310

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

7. Wachter, Esther (author). Fetal cardiovascular simulations to assess the feasibility of intrauterine ECMO.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:1cb58d76-a194-4a2f-b554-c172a8d3d78a

► The placenta is very important during the start of life, providing the fetus with oxygen and nutrients from the maternal blood. Impaired growth of the… (more)

▼ The placenta is very important during the start of life, providing the fetus with oxygen and nutrients from the maternal blood. Impaired growth of the placenta and additional placental ischaemia endangers the exchange of gasses, exchange of nutrients, and optimal growth of the fetus. This thesis investigates the feasibility of intrauterine ECMO to improve oxygen levels in fetal blood during placental ischaemia. Fetal blood would be retrieved from the umbilical artery, oxygenated in the ECMO system and fed back into the umbilical artery. The objective of this thesis is to design a cardiovascular model to simulate the cardiovascular response to an ECMO support system. A lumped parameter model is created to approximate the fetal cardiovascular system. By performing a parameter search, haemodynamic parameters were gathered for the fetal model. Data from 30 week fetuses was used as initial input, because of parameter accessibility. Parameters for the gestational age of 20 to 29 weeks were obtained by extrapolating the parameters from the fetus of 30 weeks with scaling factors. A sensitivity analysis was performed to analyse the flow and pressure distribution through the fetal cardiovascular system and the cardiovascular response to different parameters. Implementation of a cannula into one of the umbilical arteries increases the resistance of that artery. Simulating the cardiovascular response to the addition of the cannula showed promising results for the feasibility of intrauterine ECMO. The fetal heart is able to maintain blood flow through the cannula despite the fact that the resistance of the artery is increased. The placental resistance increases during placental ischaemia. Because of this higher resistance, blood flow through the placenta will decrease. However, even at a lower flow rate, oxygenation of blood flow via the umbilical artery is mostly sufficient. The reason is the high percentage of fetal cardiac output flowing through the placental circulation. The designed model is able to simulate the fetal cardiovascular system and provides a simulation tool to further develop an intrauterine ECMO support system. Advisors/Committee Members: Dankelman, Jenny (mentor), Goos, Tom (mentor), Kok, Manon (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: placental ischaemia; ECMO; lumped parameter model; fetal cardiovascular system

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APA (6^th Edition):

Wachter, E. (. (2019). Fetal cardiovascular simulations to assess the feasibility of intrauterine ECMO. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1cb58d76-a194-4a2f-b554-c172a8d3d78a

Chicago Manual of Style (16^th Edition):

Wachter, Esther (author). “Fetal cardiovascular simulations to assess the feasibility of intrauterine ECMO.” 2019. Masters Thesis, Delft University of Technology. Accessed January 22, 2021. http://resolver.tudelft.nl/uuid:1cb58d76-a194-4a2f-b554-c172a8d3d78a.

MLA Handbook (7^th Edition):

Wachter, Esther (author). “Fetal cardiovascular simulations to assess the feasibility of intrauterine ECMO.” 2019. Web. 22 Jan 2021.

Vancouver:

Wachter E(. Fetal cardiovascular simulations to assess the feasibility of intrauterine ECMO. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 22]. Available from: http://resolver.tudelft.nl/uuid:1cb58d76-a194-4a2f-b554-c172a8d3d78a.

Council of Science Editors:

Wachter E(. Fetal cardiovascular simulations to assess the feasibility of intrauterine ECMO. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:1cb58d76-a194-4a2f-b554-c172a8d3d78a

Delft University of Technology

8. Boonstra, Sjoerd (author). An investigation of the internal airfow system behavior of a Turbosail.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:24bd44e8-36c9-485c-bd8d-e47a5bb07931

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The awareness of the climate change is increasing and the effect of air-pollution is irrefutable. To decrease the emissions of large ships the required amount… (more)

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The awareness of the climate change is increasing and the effect of air-pollution is irrefutable. To decrease the emissions of large ships the required amount of fuel has to be minimized. This is done by increasing the efficiency of the engine, decreasing the hull resistance or by lowering the cruise speed. Another interesting way of decreasing the emission is by using Wind Assisted Ship Propulsion (WASP). The Turbosail is a promising type of wind propulsion for this purpose introduced by Jacques Cousteau[4]. The Turbosail is an aspirated wing which is able to generate up to 3 times more lift compared to a non aspirated wing. A lot of research has been done in order to increase the performance of the Turbosail. But this research has mainly been done on the outside of the Turbosail and the suction area is often modelled as an area with a uniform flow. In this research a model has been made in order to give insight in the behaviour and sensitivity of the suction system of the Turbosail. First the model foundation is described. A lumped parameter approach is chosen and the structure of the model is described. The model of the fan is described and after this the total model is made using Matlab Simulink. This model is made such that the number of elements (the amount of parts that the Turbosail is divided in) can be easily varied. This is done in order to perform a convergence study. Followed by a mathematical verification with carefully chosen tests the model is considered as verified. To understand the sensitivity of different parameters of the system a parameter variation is performed. Different parameters are varied and their effects are simulated. This yields insight in the sensitivity of the system and can be used in order to optimize the energy efficiency of the total suction system. Finally two possible improved designs are simulated combined with their decrease in power consumption. These results can be used for future simulations and designs with the main purpose to decrease the energy consumption of the shipping industry.

Marine Technology | Marine Engineering

Advisors/Committee Members: Vrijdag, Arthur (mentor), Visser, Klaas (graduation committee), Wellens, Peter (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Turbosail; Boundary layer suction; Wind assisted ship propulsion; lumped parameter model

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APA (6^th Edition):

Boonstra, S. (. (2020). An investigation of the internal airfow system behavior of a Turbosail. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:24bd44e8-36c9-485c-bd8d-e47a5bb07931

Chicago Manual of Style (16^th Edition):

Boonstra, Sjoerd (author). “An investigation of the internal airfow system behavior of a Turbosail.” 2020. Masters Thesis, Delft University of Technology. Accessed January 22, 2021. http://resolver.tudelft.nl/uuid:24bd44e8-36c9-485c-bd8d-e47a5bb07931.

MLA Handbook (7^th Edition):

Boonstra, Sjoerd (author). “An investigation of the internal airfow system behavior of a Turbosail.” 2020. Web. 22 Jan 2021.

Vancouver:

Boonstra S(. An investigation of the internal airfow system behavior of a Turbosail. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Jan 22]. Available from: http://resolver.tudelft.nl/uuid:24bd44e8-36c9-485c-bd8d-e47a5bb07931.

Council of Science Editors:

Boonstra S(. An investigation of the internal airfow system behavior of a Turbosail. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:24bd44e8-36c9-485c-bd8d-e47a5bb07931

NSYSU

9. Su, Hsin-Hsiang. A Novel Approach for Modeling Diodes Without Reducing the Time Step in the FDTD Method.

Degree: PhD, Electrical Engineering, 2013, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1104113-144454

► In a high-speed digital system, issues of the signal integrity (SI) associated with the high-speed circuit and printed circuit boards (PCB) become more important as… (more)

Subjects/Keywords: Lumped devices; Equivalent current source method; Multi-port circuits; Finite-difference time-domain; Signal integrity

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APA (6^th Edition):

Su, H. (2013). A Novel Approach for Modeling Diodes Without Reducing the Time Step in the FDTD Method. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1104113-144454

Chicago Manual of Style (16^th Edition):

Su, Hsin-Hsiang. “A Novel Approach for Modeling Diodes Without Reducing the Time Step in the FDTD Method.” 2013. Doctoral Dissertation, NSYSU. Accessed January 22, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1104113-144454.

MLA Handbook (7^th Edition):

Su, Hsin-Hsiang. “A Novel Approach for Modeling Diodes Without Reducing the Time Step in the FDTD Method.” 2013. Web. 22 Jan 2021.

Vancouver:

Su H. A Novel Approach for Modeling Diodes Without Reducing the Time Step in the FDTD Method. [Internet] [Doctoral dissertation]. NSYSU; 2013. [cited 2021 Jan 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1104113-144454.

Council of Science Editors:

Su H. A Novel Approach for Modeling Diodes Without Reducing the Time Step in the FDTD Method. [Doctoral Dissertation]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1104113-144454

University of Toronto

10. Hoover, Jeffery. Dynamic Analysis of Whiplash.

Degree: 2012, University of Toronto

URL: http://hdl.handle.net/1807/32245

►

This study is concerned with whiplash injuries resulting from the sudden acceleration and deceleration of the head relative to the torso in vehicle collisions. Whiplash… (more)

Subjects/Keywords: whiplash; dynamic; lumped-parameter; rigid linkage; inverse analysis; multi-body; analytical; numerical; experimental; 0548; 0541

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APA (6^th Edition):

Hoover, J. (2012). Dynamic Analysis of Whiplash. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/32245

Chicago Manual of Style (16^th Edition):

Hoover, Jeffery. “Dynamic Analysis of Whiplash.” 2012. Masters Thesis, University of Toronto. Accessed January 22, 2021. http://hdl.handle.net/1807/32245.

MLA Handbook (7^th Edition):

Hoover, Jeffery. “Dynamic Analysis of Whiplash.” 2012. Web. 22 Jan 2021.

Vancouver:

Hoover J. Dynamic Analysis of Whiplash. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1807/32245.

Council of Science Editors:

Hoover J. Dynamic Analysis of Whiplash. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/32245

11. Rajhans, Akshay H. Multi-Model Heterogeneous Verification of Cyber-Physical Systems.

Degree: 2013, Carnegie Mellon University

URL: http://repository.cmu.edu/dissertations/251

► Complex systems are designed using the model-based design paradigm in which mathematical models of systems are created and checked against specifications. Cyber-physical systems (CPS) are… (more)

▼ Complex systems are designed using the model-based design paradigm in which mathematical models of systems are created and checked against specifications. Cyber-physical systems (CPS) are complex systems in which the physical environment is sensed and controlled by computational or cyber elements possibly distributed over communication networks. Various aspects of CPS design such as physical dynamics, software, control, and communication networking must interoperate correctly for correct functioning of the systems. Modeling formalisms, analysis techniques and tools for designing these different aspects have evolved independently, and remain dissimilar and disparate. There is no unifying formalism in which one can model all these aspects equally well. Therefore, model-based design of CPS must make use of a collection of models in several different formalisms and use respective analysis methods and tools together to ensure correct system design. To enable doing this in a formal manner, this thesis develops a framework for multi-model verification of cyber-physical systems based on behavioral semantics. Heterogeneity arising from the different interacting aspects of CPS design must be addressed in order to enable system-level verification. In current practice, there is no principled approach that deals with this modeling heterogeneity within a formal framework. We develop behavioral semantics to address heterogeneity in a general yet formal manner. Our framework makes no assumptions about the specifics of any particular formalism, therefore it readily supports various formalisms, techniques and tools. Models can be analyzed independently in isolation, supporting separation of concerns. Mappings across heterogeneous semantic domains enable associations between analysis results. Interdependencies across different models and specifications can be formally represented as constraints over parameters and verification can be carried out in a semantically consistent manner. Composition of analysis results is supported both hierarchically across different levels of abstraction and structurally into interacting component models at a given level of abstraction. The theoretical concepts developed in the thesis are illustrated using a case study on the hierarchical heterogeneous verification of an automotive intersection collision avoidance system.

Subjects/Keywords: cyber-physical systems; model-based design; heterogeneity; multi-model verification; behavioral semantics; semantic consistency; Electrical and Computer Engineering

10 more images…

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APA (6^th Edition):

Rajhans, A. H. (2013). Multi-Model Heterogeneous Verification of Cyber-Physical Systems. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/251

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Rajhans, Akshay H. “Multi-Model Heterogeneous Verification of Cyber-Physical Systems.” 2013. Thesis, Carnegie Mellon University. Accessed January 22, 2021. http://repository.cmu.edu/dissertations/251.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Rajhans, Akshay H. “Multi-Model Heterogeneous Verification of Cyber-Physical Systems.” 2013. Web. 22 Jan 2021.

Vancouver:

Rajhans AH. Multi-Model Heterogeneous Verification of Cyber-Physical Systems. [Internet] [Thesis]. Carnegie Mellon University; 2013. [cited 2021 Jan 22]. Available from: http://repository.cmu.edu/dissertations/251.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Rajhans AH. Multi-Model Heterogeneous Verification of Cyber-Physical Systems. [Thesis]. Carnegie Mellon University; 2013. Available from: http://repository.cmu.edu/dissertations/251

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech

12. Lemons, Charlsie E. Examining middle-ear and tectorial membrane mechanics using computational models.

Degree: PhD, Mechanical Engineering, 2018, Georgia Tech

URL: http://hdl.handle.net/1853/62618

► The ear acts as a sensitive broadband receiver which transduces sound waves in the ear canal into electrical signals sent to the nervous system. The… (more)

Subjects/Keywords: Tectorial membrane; Middle ear; Eardrum; Hearing mechanics; Computational model; Lumped parameter; Inverse problem

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APA (6^th Edition):

Lemons, C. E. (2018). Examining middle-ear and tectorial membrane mechanics using computational models. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62618

Chicago Manual of Style (16^th Edition):

Lemons, Charlsie E. “Examining middle-ear and tectorial membrane mechanics using computational models.” 2018. Doctoral Dissertation, Georgia Tech. Accessed January 22, 2021. http://hdl.handle.net/1853/62618.

MLA Handbook (7^th Edition):

Lemons, Charlsie E. “Examining middle-ear and tectorial membrane mechanics using computational models.” 2018. Web. 22 Jan 2021.

Vancouver:

Lemons CE. Examining middle-ear and tectorial membrane mechanics using computational models. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1853/62618.

Council of Science Editors:

Lemons CE. Examining middle-ear and tectorial membrane mechanics using computational models. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/62618

Texas A&M University

13. Jamalian Ardakani, Seyedeh Samira 1987-. Modeling and Characterization of Lymphatic Vessels Using a Lumped Parameter Approach.

Degree: MS, Biomedical Engineering, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/148276

► The lymphatic system is responsible for several vital roles in human body, one of which is maintaining fluid and protein balance. There is no central… (more)

Subjects/Keywords: parameter sensitivity; Lumped-parameter model; lymph transport; lymphangion; lymphatic vessel; lymphatic system

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APA (6^th Edition):

Jamalian Ardakani, S. S. 1. (2012). Modeling and Characterization of Lymphatic Vessels Using a Lumped Parameter Approach. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148276

Chicago Manual of Style (16^th Edition):

Jamalian Ardakani, Seyedeh Samira 1987-. “Modeling and Characterization of Lymphatic Vessels Using a Lumped Parameter Approach.” 2012. Masters Thesis, Texas A&M University. Accessed January 22, 2021. http://hdl.handle.net/1969.1/148276.

MLA Handbook (7^th Edition):

Jamalian Ardakani, Seyedeh Samira 1987-. “Modeling and Characterization of Lymphatic Vessels Using a Lumped Parameter Approach.” 2012. Web. 22 Jan 2021.

Vancouver:

Jamalian Ardakani SS1. Modeling and Characterization of Lymphatic Vessels Using a Lumped Parameter Approach. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1969.1/148276.

Council of Science Editors:

Jamalian Ardakani SS1. Modeling and Characterization of Lymphatic Vessels Using a Lumped Parameter Approach. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148276

Colorado State University

14. Phillips, Canek Moises Luna. Simple lumped parameter model of the cardiovascular system, A.

Degree: MS(M.S.), Mechanical Engineering, 2011, Colorado State University

URL: http://hdl.handle.net/10217/46905

► Congestive heart failure is caused when untreated heart diseases affect malfunction in the heart to a point where the heart can no longer pump enough… (more)

Subjects/Keywords: congestive heart failure; lumped parameter model; left ventricle workload; energy cost; direct workload calculation

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APA (6^th Edition):

Phillips, C. M. L. (2011). Simple lumped parameter model of the cardiovascular system, A. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/46905

Chicago Manual of Style (16^th Edition):

Phillips, Canek Moises Luna. “Simple lumped parameter model of the cardiovascular system, A.” 2011. Masters Thesis, Colorado State University. Accessed January 22, 2021. http://hdl.handle.net/10217/46905.

MLA Handbook (7^th Edition):

Phillips, Canek Moises Luna. “Simple lumped parameter model of the cardiovascular system, A.” 2011. Web. 22 Jan 2021.

Vancouver:

Phillips CML. Simple lumped parameter model of the cardiovascular system, A. [Internet] [Masters thesis]. Colorado State University; 2011. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10217/46905.

Council of Science Editors:

Phillips CML. Simple lumped parameter model of the cardiovascular system, A. [Masters Thesis]. Colorado State University; 2011. Available from: http://hdl.handle.net/10217/46905

Rice University

15. Popp, Timothy Michael. Stochastic Analysis of Whirl in Drillstrings.

Degree: PhD, Engineering, 2020, Rice University

URL: http://hdl.handle.net/1911/108352

► Presented in this dissertation are novel models and techniques to analyze the whirling vibration of drillstrings during oil and gas (O&G) operations. Mathematical models are… (more)

▼ Presented in this dissertation are novel models and techniques to analyze the whirling vibration of drillstrings during oil and gas (O&G) operations. Mathematical models are developed to solve for the dynamic whirl response. For this purpose, the drillstring is modeled by a system of nonlinear ordinary differential equations (ODEs), which are derived using established mechanics theory. The ODEs form a lumped parameter representation accounting for the physical system. Improvements are made to these equations, such as asymmetry, Hertzian friction contact, non-Hertzian contact, geometrical misalignment, and coupling of patterns of vibration. The equations are solved using numerical integration, but analytics technique are also applied when possible. Further, stochastic techniques are introduced to solve for drillstring whirl with random process excitation. In this regard, Auto-Regressive-Moving-Average (ARMA) digital filters enable the synthesis of artificial time-histories that are compatible with a target excitation power spectrum. The target spectrum is obtained from downhole torque-on-bit (TOB) measurements, which are common excitation sources during drilling. Through Monte-Carlo simulation, the response of the dynamical system to artificial TOB time-histories is determined in a statistical sense. Furthermore, the drillstring whirl behavior is elucidated through finite element analysis (FEA) and experimental measurements. A transient FEA model is developed using a commercial software package to represent a three-dimensional (3D) whirling system. An experimental testing system is presented for the purpose of acquiring dynamic data during controlled drillstring whirl events. The FEA model and experimental data are compared against the mathematical whirl models. The efficacy of the models to characterize drillstring whirl is determined from this comparison. From a holistic perspective, the endeavor of this work is to enrich the field of drillstring dynamics by introducing novel models and techniques to better understand drillstring whirl in deterministic and stochastic systems. With the inclusion of modeling and experimental measurement the thesis seeks to strengthen the correlation between theory and reality. Advisors/Committee Members: Spanos, Pol (advisor).

Subjects/Keywords: Whirl; Drilling; Vibration; Dynamics; Stochastic; Deterministic; Model; ARMA; FEA; Lumped Parameter; Experiment; Measurement

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APA (6^th Edition):

Popp, T. M. (2020). Stochastic Analysis of Whirl in Drillstrings. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/108352

Chicago Manual of Style (16^th Edition):

Popp, Timothy Michael. “Stochastic Analysis of Whirl in Drillstrings.” 2020. Doctoral Dissertation, Rice University. Accessed January 22, 2021. http://hdl.handle.net/1911/108352.

MLA Handbook (7^th Edition):

Popp, Timothy Michael. “Stochastic Analysis of Whirl in Drillstrings.” 2020. Web. 22 Jan 2021.

Vancouver:

Popp TM. Stochastic Analysis of Whirl in Drillstrings. [Internet] [Doctoral dissertation]. Rice University; 2020. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1911/108352.

Council of Science Editors:

Popp TM. Stochastic Analysis of Whirl in Drillstrings. [Doctoral Dissertation]. Rice University; 2020. Available from: http://hdl.handle.net/1911/108352

University of Akron

16. Herbert, Joseph. Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling.

Degree: MS, Electrical Engineering, 2017, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898

► With the advent of high power density motors in applications such as electric vehicles, the need for an effective thermal analysis of motors is further… (more)

▼ With the advent of high power density motors in applications such as electric vehicles, the need for an effective thermal analysis of motors is further warranted to ensure their efficient and reliable operation. While existing Lumped Parameter Thermal Models (LPTMs) provide a convenient method for the thermal evaluation of motor designs, they provide a single, average temperature of the various regions of the motor without data on the temperature variation in the axial direction. LPTMs are a convenient reduced finite-element method to analyze the thermal performance of electric motors based on their design parameters and operating conditions. In this thesis the thermal analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor (PMa-SynRM) is conducted by proposing two LPTMs: 1. Radial Lumped Parameter Thermal Model (R-LPTM).2. Axial Lumped Parameter Thermal Model (A-LPTM).The R-LPTM adopts an existing approach considered for the thermal modeling of interior rotor configurations with the key contribution being the modeling of the unique rotor configuration of the PMa-SynRM under study. In this approach, the individual geometries of the motor are modeled as single nodes, the voltages of which correspond to the average temperature for the respective machine part. The A-LPTM introduces a novel thermal model by employing the Finite Volume Method (FVM). While the R-LPTM models heat flow only in the radial direction due to the lamination structure of the stator and the rotor regions, the extension of this approach to the axially thermally shorted conductor coil sides, the magnets and the shaft results in a relative oversimplication of the heat transfer in these regions. While equivalent lumped thermal resistances model axial heat flow in these regions in the R-LPTM, by employing the FVM in the A-LPTM a higher resolution of axial temperature data is determined by providing a more accurate method of radial and axial heat flow modeling in these regions. In this model, the conductors, magnet and shaft nodes are evaluated as a function of the position along the axial length of the machine to determine their corresponding axial temperature variation.The results of both the thermal models formed in this thesis have been evaluated and the results were compared with both experimental and Finite Element Analysis (FEA) data. The experimental data was determined using temperature sensors mounted at various points in the machine. For the temperature measurement of the magnet an innovative Printed Circuit Board (PCB) integrated with sensors and wireless data transmission capabilities was mounted on the rotor for real time axial temperature measurement of the magnets.An analysis comparing the data from the R-LPTM and the A-LPTM shows the advantages of the A-LPTM. Additionally, plots of the accuracy of data obtained from both the models clearly highlights their respective accuracy when compared to the experimentally measured values. Lastly, a sensitivity analysis of both models was determined as a function of the thermal… Advisors/Committee Members: Choi, Seungdeog (Advisor).

Subjects/Keywords: Electrical Engineering; Lumped Parameter Thermal Model; PMa-SynRM; Permanent Magnet Assisted Synchronous Reluctance Motor

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APA (6^th Edition):

Herbert, J. (2017). Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898

Chicago Manual of Style (16^th Edition):

Herbert, Joseph. “Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling.” 2017. Masters Thesis, University of Akron. Accessed January 22, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898.

MLA Handbook (7^th Edition):

Herbert, Joseph. “Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling.” 2017. Web. 22 Jan 2021.

Vancouver:

Herbert J. Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling. [Internet] [Masters thesis]. University of Akron; 2017. [cited 2021 Jan 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898.

Council of Science Editors:

Herbert J. Thermal Analysis of a Permanent Magnet Assisted Synchronous Reluctance Motor Using Lumped Parameter Thermal Modeling. [Masters Thesis]. University of Akron; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1491313645053898

Indian Institute of Science

17. Srinivas, CH Kalyan. Development Of A Knowledge-Based Hybrid Methodology For Vehicle Side Impact Safety Design.

Degree: PhD, Faculty of Engineering, 2011, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1337

► The present research work has been carried out to develop a unified knowledge-based hybrid methodology combining regression-based, lumped parameter and finite element analyses that can… (more)

▼ The present research work has been carried out to develop a unified knowledge-based hybrid methodology combining regression-based, lumped parameter and finite element analyses that can be implemented in the initial phase of vehicle design resulting in a superior side crash performance. As a first step, a regression-based model (RBM) is developed between the injury parameter Thoracic Trauma Index (TTI) of the rear SID and characteristic side impact dynamic response variables such as rear door velocity (final) and intrusion supplementing an existing RBM for front TTI prediction. In order to derive the rear TTI RBM, existing public domain vehicle crash test data provided by NHTSA has been used. A computer-based tool with a Graphical User Interface (GUI) has been developed for obtaining possible solution sets of response variables satisfying the regression relations for both front and rear TTI. As a next step in the formulation of the present hybrid methodology for vehicle side impact safety design, a new Lumped Parameter Model (LPM) representing NHTSA side impact is developed. The LPM developed consists of body sub-systems like B-pillar, front door, rear door and rocker (i.e. sill) on the struck side of the vehicle, MDB, and “rest of the vehicle” as lumped masses along with representative nonlinear springs between them. It has been envisaged that for the initial conceptual design to progress, the targets of dynamic response variables obtained from RBM should yield a set of spring characteristics broadly defining the required vehicle side structure. However, this is an inverse problem of dynamics which would require an inordinate amount of time to be solved iteratively. Hence a knowledge-based approach is adopted here to link the two sets of variables i.e., the dynamic response parameters (such as average door and B-pillar velocities, door intrusion, etc.) and the stiffness and strength characteristics of the springs present in LPM. In effect, this mapping is accomplished with the help of an artificial neural network (ANN) algorithm (referred to as ANN_RBM_LPM in the current work). To generate the required knowledge database for ANN_RBM_LPM, one thousand cases of LPM chosen with the help of the Latin Hypercube technique are run with varying spring characteristics. The goal of finding the desired design solutions describing vehicle geometry in an efficient manner is accomplished with the help of a second ANN algorithm which links sets of dynamic spring characteristics with sets of sectional properties of doors, B-pillar and rocker (referred as ANN_LPM_FEM in the current work). The implementation of this approach requires creation of a knowledge database containing paired sets of spring characteristics and sectional details just mentioned. The effectiveness of the hybrid methodology comprising both ANN_RBM_LPM and ANN_LPM_FEM is finally illustrated by improving the side impact performance of a Honda Accord finite element model. Thus, the unique knowledge-based hybrid approach developed here can be deployed in real world… Advisors/Committee Members: Deb, Anindya (advisor).

Subjects/Keywords: Vehicles - Safety Engineering; Knowledge Based System; Regression-Based Models (RBMs); Lumped Parameter Models; Vehicles - Crashworthiness; Vehicle Side Impact; Side Impact Safety Design; Lumped Parameter Model (LPM); Automotive Engineering

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APA (6^th Edition):

Srinivas, C. K. (2011). Development Of A Knowledge-Based Hybrid Methodology For Vehicle Side Impact Safety Design. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1337

Chicago Manual of Style (16^th Edition):

Srinivas, CH Kalyan. “Development Of A Knowledge-Based Hybrid Methodology For Vehicle Side Impact Safety Design.” 2011. Doctoral Dissertation, Indian Institute of Science. Accessed January 22, 2021. http://etd.iisc.ac.in/handle/2005/1337.

MLA Handbook (7^th Edition):

Srinivas, CH Kalyan. “Development Of A Knowledge-Based Hybrid Methodology For Vehicle Side Impact Safety Design.” 2011. Web. 22 Jan 2021.

Vancouver:

Srinivas CK. Development Of A Knowledge-Based Hybrid Methodology For Vehicle Side Impact Safety Design. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2011. [cited 2021 Jan 22]. Available from: http://etd.iisc.ac.in/handle/2005/1337.

Council of Science Editors:

Srinivas CK. Development Of A Knowledge-Based Hybrid Methodology For Vehicle Side Impact Safety Design. [Doctoral Dissertation]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ac.in/handle/2005/1337

NSYSU

18. Wang, Chien-Chung. An Efficient Scheme for Processing Arbitrary Lumped Multi-Port Devices in the Finite-Difference Time-Domain Method.

Degree: PhD, Electrical Engineering, 2007, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0627107-125210

► Developing full-wave simulators for high-frequency circuit simulation is a topic many researchers have investigated. Generally speaking, methods invoking analytic pre-processing of the deviceâs V-I relations… (more)

Subjects/Keywords: lumped device; multi-port device; finite-difference time-domain

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APA (6^th Edition):

Wang, C. (2007). An Efficient Scheme for Processing Arbitrary Lumped Multi-Port Devices in the Finite-Difference Time-Domain Method. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0627107-125210

Chicago Manual of Style (16^th Edition):

Wang, Chien-Chung. “An Efficient Scheme for Processing Arbitrary Lumped Multi-Port Devices in the Finite-Difference Time-Domain Method.” 2007. Doctoral Dissertation, NSYSU. Accessed January 22, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0627107-125210.

MLA Handbook (7^th Edition):

Wang, Chien-Chung. “An Efficient Scheme for Processing Arbitrary Lumped Multi-Port Devices in the Finite-Difference Time-Domain Method.” 2007. Web. 22 Jan 2021.

Vancouver:

Wang C. An Efficient Scheme for Processing Arbitrary Lumped Multi-Port Devices in the Finite-Difference Time-Domain Method. [Internet] [Doctoral dissertation]. NSYSU; 2007. [cited 2021 Jan 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0627107-125210.

Council of Science Editors:

Wang C. An Efficient Scheme for Processing Arbitrary Lumped Multi-Port Devices in the Finite-Difference Time-Domain Method. [Doctoral Dissertation]. NSYSU; 2007. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0627107-125210

University of Notre Dame

19. Benjamin Emery Mertz. Refinement, Validation, and Implementation of Lumped Circuit Element Model for Single Dielectric Barrier Discharge Plasma Actuators</h1>.

Degree: Aerospace and Mechanical Engineering, 2010, University of Notre Dame

URL: https://curate.nd.edu/show/xw42n586h92

► Single dielectric barrier discharge (SDBD) plasma actuators have been applied to a wide variety of aerodynamic flow control applications ranging from stall suppression of… (more)

Subjects/Keywords: empirical model; plasma actuator; lumped circuit element; model

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APA (6^th Edition):

Mertz, B. E. (2010). Refinement, Validation, and Implementation of Lumped Circuit Element Model for Single Dielectric Barrier Discharge Plasma Actuators</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/xw42n586h92

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mertz, Benjamin Emery. “Refinement, Validation, and Implementation of Lumped Circuit Element Model for Single Dielectric Barrier Discharge Plasma Actuators</h1>.” 2010. Thesis, University of Notre Dame. Accessed January 22, 2021. https://curate.nd.edu/show/xw42n586h92.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mertz, Benjamin Emery. “Refinement, Validation, and Implementation of Lumped Circuit Element Model for Single Dielectric Barrier Discharge Plasma Actuators</h1>.” 2010. Web. 22 Jan 2021.

Vancouver:

Mertz BE. Refinement, Validation, and Implementation of Lumped Circuit Element Model for Single Dielectric Barrier Discharge Plasma Actuators</h1>. [Internet] [Thesis]. University of Notre Dame; 2010. [cited 2021 Jan 22]. Available from: https://curate.nd.edu/show/xw42n586h92.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mertz BE. Refinement, Validation, and Implementation of Lumped Circuit Element Model for Single Dielectric Barrier Discharge Plasma Actuators</h1>. [Thesis]. University of Notre Dame; 2010. Available from: https://curate.nd.edu/show/xw42n586h92

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

20. Deshpande, Lav Gurunath. Simulation of vibrations caused by faults in bearings and gears.

Degree: Mechanical & Manufacturing Engineering, 2014, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/53647 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12342/SOURCE02?view=true

► This research presents improved techniques to simulate gearbox vibrations due to faults in gears and bearings.Lumped parameter models (LPMs) are widely used to study the… (more)

▼ This research presents improved techniques to simulate gearbox vibrations due to faults in gears and bearings.Lumped parameter models (LPMs) are widely used to study the dynamic behaviour of mechanical systems such as gearboxes. However, LPMs contain limited information about flexible structures such as the casing. This results in poor spectral matching over a wide frequency range, and was found not to properly represent the modulation of gearmesh signals by extended bearing faults, this being affected by interaction with the casing dynamic properties. An alternative approach based on direct finite element analysis (FEA) is not usually viable as the model size and thus computing resource requirements become prohibitive. Hence an improved simulation model was developed by coupling the LPM of the internals (shafts, gears and bearings) with a reduced FE model of the casing based on the Craig-Bampton method of component mode synthesis (CMS) over the frequency range of interest. Prior to model reduction, the FE model of the casing was updated by correlating with the results of experimental modal analysis (EMA). The combined model was equally capable of simulating bearing faults in the UNSW parallel shaft spur gearbox. The responses due to bearing fault entry and exit were investigated, which can be used to predict the fault size a vital parameter in bearing diagnostics and prognostics. Simulated results compared well with measurements. The combined model was further improved by making a reduced FE model of the internals, to create a full reduced model of the gearbox.A simplified transverse-torsional LPM was developed to simulate planet gear faults such as tooth cracks and spalls in the UNSW planetary gearbox. The effect of the two simultaneous meshes of the planet gear with the ring and sun gears was investigated since the contact with the two gears is on opposite flanks of each planet gear tooth. The simulated results correlated well with measurements and clearly differentiated the two types of faults with reduction in the stiffness due to a tooth crack visible in both contacts whereas a spall on one flank showed up only in one contact. Advisors/Committee Members: Randall, Robert, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, Sawalhi, Nader, School of Mechanical Engineering, Prince Mohammad Bin Fahd University, Kingdom of Saudi Arabia, Smith, Wade, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Lumped parameter model; Gear/bearing fault simulation; Component mode synthesis; Finite element model updating; Planetary gearbox; Vibration signal processing

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APA (6^th Edition):

Deshpande, L. G. (2014). Simulation of vibrations caused by faults in bearings and gears. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/53647 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12342/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Deshpande, Lav Gurunath. “Simulation of vibrations caused by faults in bearings and gears.” 2014. Doctoral Dissertation, University of New South Wales. Accessed January 22, 2021. http://handle.unsw.edu.au/1959.4/53647 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12342/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Deshpande, Lav Gurunath. “Simulation of vibrations caused by faults in bearings and gears.” 2014. Web. 22 Jan 2021.

Vancouver:

Deshpande LG. Simulation of vibrations caused by faults in bearings and gears. [Internet] [Doctoral dissertation]. University of New South Wales; 2014. [cited 2021 Jan 22]. Available from: http://handle.unsw.edu.au/1959.4/53647 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12342/SOURCE02?view=true.

Council of Science Editors:

Deshpande LG. Simulation of vibrations caused by faults in bearings and gears. [Doctoral Dissertation]. University of New South Wales; 2014. Available from: http://handle.unsw.edu.au/1959.4/53647 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12342/SOURCE02?view=true

21. Alam, S. M. Shafiul. Multi-agent estimation and control of cyber-physical systems.

Degree: PhD, Electrical and Computer Engineering, 2015, Kansas State University

URL: http://hdl.handle.net/2097/20494

► A cyber-physical system (CPS) typically consists of networked computational elements that control physical processes. As an integral part of CPS, the widespread deployment of communicable… (more)

▼ A cyber-physical system (CPS) typically consists of networked computational elements that control physical processes. As an integral part of CPS, the widespread deployment of communicable sensors makes the task of monitoring and control quite challenging especially from the viewpoint of scalability and complexity. This research investigates two unique aspects of overcoming such barriers, making a CPS more robust against data explosion and network vulnerabilities. First, the correlated characteristics of high-resolution sensor data are exploited to significantly reduce the fused data volume. Specifically, spatial, temporal and spatiotemporal compressed sensing approaches are applied to sample the measurements in compressed form. Such aggregation can directly be used in centralized static state estimation even for a nonlinear system. This approach results in a remarkable reduction in communication overhead as well as memory/storage requirement. Secondly, an agent based architecture is proposed, where the communicable sensors (identified as agents) also perform local information processing. Based on the local and underdetermined observation space, each agent can monitor only a specific subset of global CPS states, necessitating neighborhood information exchange. In this framework, we propose an agent based static state estimation encompassing local consensus and least square solution. Necessary bounds for the consensus weights are obtained through the maximum eigenvalue based convergence analysis and are verified for a radial power distribution network. The agent based formulation is also applied for a linear dynamical system and the consensus approach is found to exhibit better and more robust performance compared to a diffusion filter. The agent based Kalman consensus filter (AKCF) is further investigated, when the agents can choose between measurements and/or consensus, allowing the economic allocation of sensing and communication tasks as well as the temporary omission of faulty agents. The filter stability is guaranteed by deriving necessary consensus bounds through Lyapunov stability analysis. The states dynamically estimated from AKCF can be used for state-feedback control in a model predictive fashion. The effect of lossy communication is investigated and critical bounds on the link failure rate and the degree of consensus that ensure stability of the agent based control are derived and verified via simulations. Advisors/Committee Members: Balasubramaniam Natarajan.

Subjects/Keywords: Cyber-physical system; Multi-agent system; Compressed sensing; Kalman consensus filter; Model predictive control; Lyapunov stability analysis; Electrical Engineering (0544)

10 more images…

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APA (6^th Edition):

Alam, S. M. S. (2015). Multi-agent estimation and control of cyber-physical systems. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/20494

Chicago Manual of Style (16^th Edition):

Alam, S M Shafiul. “Multi-agent estimation and control of cyber-physical systems.” 2015. Doctoral Dissertation, Kansas State University. Accessed January 22, 2021. http://hdl.handle.net/2097/20494.

MLA Handbook (7^th Edition):

Alam, S M Shafiul. “Multi-agent estimation and control of cyber-physical systems.” 2015. Web. 22 Jan 2021.

Vancouver:

Alam SMS. Multi-agent estimation and control of cyber-physical systems. [Internet] [Doctoral dissertation]. Kansas State University; 2015. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2097/20494.

Council of Science Editors:

Alam SMS. Multi-agent estimation and control of cyber-physical systems. [Doctoral Dissertation]. Kansas State University; 2015. Available from: http://hdl.handle.net/2097/20494

KTH

22. Svensson, Oskar. Electrohydraulic Power Steering Simulation : Dynamic, thermal and hydraulic modelling.

Degree: Electrical Engineering and Computer Science (EECS), 2019, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265674

►

There are several benets of electrohydraulic power steering systems, as compared to hydraulicpower steering systems where the pump is driven directly by the engine… (more)

▼

There are several benets of electrohydraulic power steering systems, as compared to hydraulicpower steering systems where the pump is driven directly by the engine of the vehicle. Someof these benets are increased eciency and improved steering performance. The purpose ofthis project is to create a simulation model of the electrohydraulic power steering system inSimulink, excluding the hydraulic circuit. The model should thus consist of the electric motor,the drive electronics, the control system, the hydraulic pump as well as the communication andinterface to the master simulation system in which the model will be used.As a start a mathematical model of the motor is derived. Then the motor controller includingtwo current controllers and a speed controller is developed. The switching signals for the threephase bridge that drives the motor are calculated using space vector modulation. The motordrives a hydraulic pump, which is modeled using data sheet eciency curves. Finally a thermalmodel of the drive is developed. To fulll real time requirements, a lumped parameter approachis chosen. The nal model is exported as a Functional Mock-up Unit, which is a black-boxencapsulation of the complete simulation model.The simulation model is compared to measurement data to conrm its validity. Thesecomparisons shows that the dynamic response of the motor and its controller are close to themeasured values and that the thermal model adequately corresponds to the thermal tests. Thehydraulic pump model varied from measurements more than the other sub-modules. It was,however, seen as acceptable. Overall the system response was satisfactory, but naturally a lotof future improvements and new features could be made to improve the model.

Det finns flera fördelar med elektrohydraulisk servostyrning, där hydraulpumpen drivs av en el-motor, jämfört med hydraulisk servostyrning, där pumpen drivs direkt av fordonets förbränningsmotor. Några av dessa fördelar är ökad effektivitet och förbättrad styrprestanda. Syftet med detta projekt är att skapa en Simulink-modell av ett elektrohydraulisk system för servostyrning, exklusive hydraulkretsen. Modellen ska alltså bestå av delmodeller för elmotorn, drivelektroniken, styrsystemet, hydraulpumpen samt kommunikation med den övergripande simuleringsplattformen.Inledningsvis beskrivs en matematisk modell av elmotorn och efter det utvecklas motorstyrningen, bestående av två strömregulatorer samt en hastighetsregulator. Spänningen från strömregulatorerna uppnås genom space vector-modulation, som beräknar de pulskvoter som krävs för att uppnå denna spänning. Elmotorn driver en pump. Denna pump modelleras med hjälp av data från pumpens datablad. Slutligen modelleras drivelektronikens termiska egenskaper med ett termiskt nätverk. Den slutliga modellen omsluts av en Functional Mock-up Unit somintegreras i den övergripande simuleringsplattformen.

Subjects/Keywords: PMSM; SVPWM; vector control; FOC; lumped parameter model; LPM; hydraulic pump; simulation; Engineering and Technology; Teknik och teknologier

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APA (6^th Edition):

Svensson, O. (2019). Electrohydraulic Power Steering Simulation : Dynamic, thermal and hydraulic modelling. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265674

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Svensson, Oskar. “Electrohydraulic Power Steering Simulation : Dynamic, thermal and hydraulic modelling.” 2019. Thesis, KTH. Accessed January 22, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265674.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Svensson, Oskar. “Electrohydraulic Power Steering Simulation : Dynamic, thermal and hydraulic modelling.” 2019. Web. 22 Jan 2021.

Vancouver:

Svensson O. Electrohydraulic Power Steering Simulation : Dynamic, thermal and hydraulic modelling. [Internet] [Thesis]. KTH; 2019. [cited 2021 Jan 22]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265674.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Svensson O. Electrohydraulic Power Steering Simulation : Dynamic, thermal and hydraulic modelling. [Thesis]. KTH; 2019. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265674

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Iowa State University

23. Mineroff, Joshua. An optimization and uncertainty quantification framework for patient-specific cardiac modeling.

Degree: 2018, Iowa State University

URL: https://lib.dr.iastate.edu/etd/17269

► Patient-specific cardiac models can be used to improve the diagnosis of cardiovascular diseases. However, practical application of these models is impeded by the computational costs… (more)

▼ Patient-specific cardiac models can be used to improve the diagnosis of cardiovascular diseases. However, practical application of these models is impeded by the computational costs and numerical uncertainties of fitting them to clinical measurements from individual patients. Reliable and efficient model tuning within medically-appropriate error bounds is a requirement for practical deployment in the time-constrained environment of the clinic. In this work, we present a framework to efficiently tune parameters of patient-specific mechanistic models using routinely acquired non-invasive patient data with a hybrid particle swarm and pattern search optimization algorithm. The proposed framework is used to tune full-cycle lumped parameter circulatory models using clinical data obtained from patients as well as canine subjects; showing that the framework can be easily adapted to optimize cross-species models. It is also used to simultaneously obtain the unloaded geometry and passive myocardial material parameters of four left-ventricular cardiac finite element models constructed from canine subject MRI data. This demonstrates that the proposed approach can support the use of complex models to obtain data that cannot be directly measured. The patients gave informed consent and the canine subject studies were approved by the local Institutional Review Boards. The optimized results in all case studies were within acceptable error tolerances. Additionally, the framework is extended to include uncertainty quantification – supporting model tuning with often-unreliable data sources that are ill-suited to a deterministic approach. The proposed approach for probabilistic model tuning discovers distributions of model inputs which generate target output distributions. Probabilistic sampling is performed using a model surrogate for computational efficiency and a general distribution parameterization is used to describe each input. The approach is tested on four test cases using CircAdapt, a cardiac circulatory model. Three test cases are synthetic, aiming to match the output distributions generated using known reference input data distributions, while the fourth example uses real-world patient data for the output distributions to obtain the input distribution. The results demonstrate accurate reproduction of the target output distributions, with accurate recreation of reference inputs for the three synthetic examples. Overall, this work automates the use of biomechanics and circulatory cardiac models in both clinical and research environments by ameliorating the tedious process of manually fitting model parameters and supports the use of more complex models in practice through the quantification of error.

Subjects/Keywords: Cardiac biomechanics; Design; Lumped-parameter circulation model; Optimization; Patient-specific modeling; Uncertainty quantification; Art and Design; Engineering; Mechanical Engineering

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APA (6^th Edition):

Mineroff, J. (2018). An optimization and uncertainty quantification framework for patient-specific cardiac modeling. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/17269

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mineroff, Joshua. “An optimization and uncertainty quantification framework for patient-specific cardiac modeling.” 2018. Thesis, Iowa State University. Accessed January 22, 2021. https://lib.dr.iastate.edu/etd/17269.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mineroff, Joshua. “An optimization and uncertainty quantification framework for patient-specific cardiac modeling.” 2018. Web. 22 Jan 2021.

Vancouver:

Mineroff J. An optimization and uncertainty quantification framework for patient-specific cardiac modeling. [Internet] [Thesis]. Iowa State University; 2018. [cited 2021 Jan 22]. Available from: https://lib.dr.iastate.edu/etd/17269.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mineroff J. An optimization and uncertainty quantification framework for patient-specific cardiac modeling. [Thesis]. Iowa State University; 2018. Available from: https://lib.dr.iastate.edu/etd/17269

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

24. Linskens, H.T.K. (author). Tether Dynamics Analysis and Guidance & Control Design for Active Space Debris Removal.

Degree: 2015, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:ea17ecb8-a9c1-4ac0-a209-75526ad54f14

► Recent years have seen a steep increase in research being performed towards active space debris removal: space debris has proven to be a very real… (more)

▼ Recent years have seen a steep increase in research being performed towards active space debris removal: space debris has proven to be a very real threat to operational spacecraft, and studies indicate that the frequency of collisions will only increase if nothing is done to remove large pieces of debris. In particular, ESA has done studies towards removing Envisat from orbit, after communications were lost and were unable to be reestablished. To this end, a scenario was proposed in which a robotic chaser satellite would use a tether to interface with Envisat, either using a net or a harpoon, and proceed to deorbit the resulting tethered system. This research tackles two main challenges relating to this scenario. First, a suitable model for the tether was developed by discretizing the tether into a number of point masses and massless Kelvin-Voigt elements. The influence of the number of nodes was investigated, showing that increasing the number of nodes used does not significantly increase the fidelity of the solution. Therefore, it was chosen to model the tether with two nodes and three elements. Additionally, multiple combinations of tether length, stiffness, and damping were investigated. Second, a preliminary design for a guidance and control system was developed. This system uses multiple fixed-duration burns as the main deorbit strategy. The guidance system controls the relative state of the chaser with respect to the target during and after these main engine burns: during burns, a hold point is established at the equilibrium length of the tether, and during coasting phases the tether is kept slightly in tension to reduce target and tether motion. At the transition between thrusting and coasting phases, the thrust is gradually throttled down to further decrease these motions. The control system is designed to keep the chaser level with the local horizon at all times. During the design process, the performance of guidance and control systems based on linear quadratic regulators was used as a baseline for the same systems based on sliding-mode control. Furthermore, three different thrust levels for the deorbit burn were examined. It was found that the system based on sliding-mode control offered considerable performance improvements over the LQR-based system: total propellant consumption was reduced by an average of 48%, while adhering to the same tolerances. Furthermore, it was determined that high thrust levels are desirable for both reducing propellant consumption as well as reducing target rotation. In terms of safety, collision can best be avoided by using lower thrust levels or longer tethers. While this seems to conflict with minimizing required propellant, minimal target rotation and minimal propellant consumption can still be achieved by using long tethers with high stiffness. Finally, it was found that while sensitive to small changes in the initial conditions, the precision of the terminal point is still high enough to allow the target to be deorbited in the South Pacific Ocean. This result was… Advisors/Committee Members: Mooij, E. (mentor).

Subjects/Keywords: space debris; active debris removal; tether dynamics; guidance; control; sliding mode control; Envisat; lumped-mass model; Kelvin-Voigt material

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APA (6^th Edition):

Linskens, H. T. K. (. (2015). Tether Dynamics Analysis and Guidance & Control Design for Active Space Debris Removal. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:ea17ecb8-a9c1-4ac0-a209-75526ad54f14

Chicago Manual of Style (16^th Edition):

Linskens, H T K (author). “Tether Dynamics Analysis and Guidance & Control Design for Active Space Debris Removal.” 2015. Masters Thesis, Delft University of Technology. Accessed January 22, 2021. http://resolver.tudelft.nl/uuid:ea17ecb8-a9c1-4ac0-a209-75526ad54f14.

MLA Handbook (7^th Edition):

Linskens, H T K (author). “Tether Dynamics Analysis and Guidance & Control Design for Active Space Debris Removal.” 2015. Web. 22 Jan 2021.

Vancouver:

Linskens HTK(. Tether Dynamics Analysis and Guidance & Control Design for Active Space Debris Removal. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Jan 22]. Available from: http://resolver.tudelft.nl/uuid:ea17ecb8-a9c1-4ac0-a209-75526ad54f14.

Council of Science Editors:

Linskens HTK(. Tether Dynamics Analysis and Guidance & Control Design for Active Space Debris Removal. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:ea17ecb8-a9c1-4ac0-a209-75526ad54f14

University of Western Ontario

25. Onaizah, Onaizah. Blood Supply to the Brain via the Carotid Arteries: Examining Obstructive and Sclerotic Disorders using Theoretical and Experimental Models.

Degree: 2015, University of Western Ontario

URL: https://ir.lib.uwo.ca/etd/3150

► Stroke remains one of the leading causes of death in North America. Approximately half of all ischemic episodes are a direct result of carotid artery… (more)

Subjects/Keywords: carotid artery disease; carotid stenosis; carotid compliance; impedance; lumped parameter model; atherosclerosis; stroke.; Biomechanics and Biotransport

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APA (6^th Edition):

Onaizah, O. (2015). Blood Supply to the Brain via the Carotid Arteries: Examining Obstructive and Sclerotic Disorders using Theoretical and Experimental Models. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/3150

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Onaizah, Onaizah. “Blood Supply to the Brain via the Carotid Arteries: Examining Obstructive and Sclerotic Disorders using Theoretical and Experimental Models.” 2015. Thesis, University of Western Ontario. Accessed January 22, 2021. https://ir.lib.uwo.ca/etd/3150.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Onaizah, Onaizah. “Blood Supply to the Brain via the Carotid Arteries: Examining Obstructive and Sclerotic Disorders using Theoretical and Experimental Models.” 2015. Web. 22 Jan 2021.

Vancouver:

Onaizah O. Blood Supply to the Brain via the Carotid Arteries: Examining Obstructive and Sclerotic Disorders using Theoretical and Experimental Models. [Internet] [Thesis]. University of Western Ontario; 2015. [cited 2021 Jan 22]. Available from: https://ir.lib.uwo.ca/etd/3150.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Onaizah O. Blood Supply to the Brain via the Carotid Arteries: Examining Obstructive and Sclerotic Disorders using Theoretical and Experimental Models. [Thesis]. University of Western Ontario; 2015. Available from: https://ir.lib.uwo.ca/etd/3150

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

26. Wang, Haoting. Experimental and Modeling Study of the Thermal Management of Li-ion Battery Packs.

Degree: PhD, Aerospace Engineering, 2017, Virginia Tech

URL: http://hdl.handle.net/10919/79660

► This work reports the experimental and numerical study of the thermal management of Li-ion battery packs under the context of electric vehicle (EV) or hybrid… (more)

Subjects/Keywords: Thermal management; Li-ion battery pack; actively controlled cooling; lumped parameter thermal model; wind tunnel test

12 more images…

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APA (6^th Edition):

Wang, H. (2017). Experimental and Modeling Study of the Thermal Management of Li-ion Battery Packs. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/79660

Chicago Manual of Style (16^th Edition):

Wang, Haoting. “Experimental and Modeling Study of the Thermal Management of Li-ion Battery Packs.” 2017. Doctoral Dissertation, Virginia Tech. Accessed January 22, 2021. http://hdl.handle.net/10919/79660.

MLA Handbook (7^th Edition):

Wang, Haoting. “Experimental and Modeling Study of the Thermal Management of Li-ion Battery Packs.” 2017. Web. 22 Jan 2021.

Vancouver:

Wang H. Experimental and Modeling Study of the Thermal Management of Li-ion Battery Packs. [Internet] [Doctoral dissertation]. Virginia Tech; 2017. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10919/79660.

Council of Science Editors:

Wang H. Experimental and Modeling Study of the Thermal Management of Li-ion Battery Packs. [Doctoral Dissertation]. Virginia Tech; 2017. Available from: http://hdl.handle.net/10919/79660

University of Bradford

27. John, Yakubu M. Kinetic modelling simulation and optimal operation of fluid catalytic cracking of crude oil : hydrodynamic investigation of riser gas phase compressibility factor, kinetic parameter estimation strategy and optimal yields of propylene, diesel and gasoline in fluid catalytic cracking unit.

Degree: PhD, 2018, University of Bradford

URL: http://hdl.handle.net/10454/17323

► The Fluidized Catalytic Cracking (FCC) is known for its ability to convert refinery wastes into useful fuels such as gasoline, diesel and some lighter products… (more)

▼ The Fluidized Catalytic Cracking (FCC) is known for its ability to convert refinery wastes into useful fuels such as gasoline, diesel and some lighter products such as ethylene and propylene, which are major building blocks for the polyethylene and polypropylene production. It is the most important unit of the refinery. However, changes in quality, nature of crude oil blends feedstock, environmental changes and the desire to obtain higher profitability, lead to many alternative operating conditions of the FCC riser. There are two major reactors in the FCC unit: the riser and the regenerator. The production objective of the riser is the maximisation of gasoline and diesel, but it can also be used to maximise products like propylene, butylene etc. For the regenerator, it is for regeneration of spent or deactivated catalyst. To realise these objectives, mathematical models of the riser, disengage-stripping section, cyclones and regenerator were adopted from the literature and modified, and then used on the gPROMS model builder platform to make a virtual form of the FCC unit. A new parameter estimation technique was developed in this research and used to estimate new kinetic parameters for a new six lumps kinetic model based on an industrial unit. Research outputs have resulted in the following major products' yields: gasoline (plant; 47.31 wt% and simulation; 48.63 wt%) and diesel (plant; 18.57 wt% and simulation; 18.42 wt%) and this readily validates the new estimation methodology as well as the kinetic parameters estimated. The same methodology was used to estimate kinetic parameters for a new kinetic reaction scheme that considered propylene as a single lump. The yield of propylene was found to be 4.59 wt%, which is consistent with published data. For the first time, a Z-factor correlation analysis was used in the riser simulation to improve the hydrodynamics. It was found that different Z factor correlations predicted different riser operating pressures (90 - 279 kPa) and temperatures as well as the riser products. The Z factor correlation of Heidaryan et al. (2010a) was found to represent the condition of the riser, and depending on the catalyst-to-oil ratio, this ranges from 1.06 at the inlet of the riser to 0.92 at the exit. Optimisation was carried out to maximise gasoline, propylene in the riser and minimise CO2 in the regenerator. An increase of 4.51% gasoline, 8.93 wt.% increase in propylene as a single lump and 5.24 % reduction of carbon dioxide emission were achieved. Finally, varying the riser diameter was found to have very little effect on the yields of the riser products.

Subjects/Keywords: FCC riser; Modelling and simulation; Six-lumped model; Parameter estimation; Maximisation; Propylene; Optimisation; Gasoline; Diesel; CO2; Compressibility factor

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APA (6^th Edition):

John, Y. M. (2018). Kinetic modelling simulation and optimal operation of fluid catalytic cracking of crude oil : hydrodynamic investigation of riser gas phase compressibility factor, kinetic parameter estimation strategy and optimal yields of propylene, diesel and gasoline in fluid catalytic cracking unit. (Doctoral Dissertation). University of Bradford. Retrieved from http://hdl.handle.net/10454/17323

Chicago Manual of Style (16^th Edition):

John, Yakubu M. “Kinetic modelling simulation and optimal operation of fluid catalytic cracking of crude oil : hydrodynamic investigation of riser gas phase compressibility factor, kinetic parameter estimation strategy and optimal yields of propylene, diesel and gasoline in fluid catalytic cracking unit.” 2018. Doctoral Dissertation, University of Bradford. Accessed January 22, 2021. http://hdl.handle.net/10454/17323.

MLA Handbook (7^th Edition):

John, Yakubu M. “Kinetic modelling simulation and optimal operation of fluid catalytic cracking of crude oil : hydrodynamic investigation of riser gas phase compressibility factor, kinetic parameter estimation strategy and optimal yields of propylene, diesel and gasoline in fluid catalytic cracking unit.” 2018. Web. 22 Jan 2021.

Vancouver:

John YM. Kinetic modelling simulation and optimal operation of fluid catalytic cracking of crude oil : hydrodynamic investigation of riser gas phase compressibility factor, kinetic parameter estimation strategy and optimal yields of propylene, diesel and gasoline in fluid catalytic cracking unit. [Internet] [Doctoral dissertation]. University of Bradford; 2018. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10454/17323.

Council of Science Editors:

John YM. Kinetic modelling simulation and optimal operation of fluid catalytic cracking of crude oil : hydrodynamic investigation of riser gas phase compressibility factor, kinetic parameter estimation strategy and optimal yields of propylene, diesel and gasoline in fluid catalytic cracking unit. [Doctoral Dissertation]. University of Bradford; 2018. Available from: http://hdl.handle.net/10454/17323

University of Akron

28. Tarek, Md Tawhid Bin. Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction.

Degree: MSin Engineering, Electrical Engineering, 2017, University of Akron

URL: http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844

► The permanent magnet assisted synchronous reluctance motor (PMa-SynRM) can be defined as a hybrid motor which utilizes the advantages of both the synchronous reluctance motor… (more)

▼ The permanent magnet assisted synchronous reluctance motor (PMa-SynRM) can be defined as a hybrid motor which utilizes the advantages of both the synchronous reluctance motor (SynRM) and the interior permanent magnet motor (IPM). PMa-SynRM’s ability to have a wider flux weakening range and less risk of demagnetization makes it a perfect candidate for high-speed applications. However, one of the main challenges for PMa-SynRM operating as a high-speed motor is the stress generated in the rotor. This thesis presents an optimal design procedure and rotor shape modification of a high-speed multiphase PMa-SynRM for stress reduction.In this study, a high-speed design of a five-phase PMa-SynRM has been done based on a low-speed benchmark model. An overall design procedure consisting of a lumped parameter model (LPM) and a differential evolution strategy (DES) was developed. In this study, a lumped parameter model (LPM) is used to initially design the five-phase PMa-SynRM. By using LPM and design parameters of stator and rotor with given ranges, thousands of design have been generated. From these designs, an optimal high-speed model was developed with the help of a differential evolution strategy (DES). To facilitate high-speed design, a stress function and other performance parameters are included in the objective function (OB).The optimized 25krpm five-phase PMa-SynRM is implemented in the finite element analysis (FEA) for simulation. Simulation results of the average and cogging torque high-speed model have been analyzed. Another high-speed model has been developed without considering stress function in the design. Comparison of stress has been done between the two high-speed models by doing stress analysis. Simulation results indicated that stress can be reduced by 30.14% if it is included in the design process. To reduce the stress of the high-speed PMa-SynRM more, a mini flux barrier (FB) has been added to the rotor. By using DES, the design parameters of the mini FB have been optimized while considering the performance parameters such as average torque, saturation in the mini FB area and the deformation as constraints. Stress analysis has been done to see the improvement after adding the optimized mini FB in the high-speed model. It showed that reduction of stress in the rotor was 15.73% after adding the mini flux barrier.Finally, a novel algorithm of the center post and rib length optimization for the high-speed PMa-SynRM for stress reduction is presented. By using multivariate correlation and nonlinear regression analysis, performance parameters (average torque, induced back EMF, stress, and deformation) have been modeled as a function of the center post and rib length in second-order nonlinear equations. An initially designed 30krpm PMa-SynRM has provided the sample data for those analyses. These nonlinear equations are used for the optimization, whose objective is stress reduction while optimizing the center post and rib length. The comparison has been done between the optimized motor and initially designed motor… Advisors/Committee Members: Choi, Seungdeog (Advisor).

Subjects/Keywords: Engineering; High-speed; PMa-SynRM; machine design; stress analysis; lumped parameter model; differential evolution strategy; multivariate correlation; nonlinear regression

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APA (6^th Edition):

Tarek, M. T. B. (2017). Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844

Chicago Manual of Style (16^th Edition):

Tarek, Md Tawhid Bin. “Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction.” 2017. Masters Thesis, University of Akron. Accessed January 22, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844.

MLA Handbook (7^th Edition):

Tarek, Md Tawhid Bin. “Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction.” 2017. Web. 22 Jan 2021.

Vancouver:

Tarek MTB. Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction. [Internet] [Masters thesis]. University of Akron; 2017. [cited 2021 Jan 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844.

Council of Science Editors:

Tarek MTB. Optimal High-Speed Design and Rotor Shape Modification of Multiphase Permanent Magnet Assisted Synchronous Reluctance Machines for Stress Reduction. [Masters Thesis]. University of Akron; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1510617496931844

University of Nairobi

29. Oriedi, David O. A model for supporting decisions using multi-agent systems co-operation: a simulation of donor funding in health environment .

Degree: 2011, University of Nairobi

URL: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/23348

► This study addresses the development ofa multi-agent system model for use in supporting group decision making and the challenges that face the implementation of such… (more)

Subjects/Keywords: Multi-Agent System; Model

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APA (6^th Edition):

Oriedi, D. O. (2011). A model for supporting decisions using multi-agent systems co-operation: a simulation of donor funding in health environment . (Thesis). University of Nairobi. Retrieved from http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/23348

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Oriedi, David O. “A model for supporting decisions using multi-agent systems co-operation: a simulation of donor funding in health environment .” 2011. Thesis, University of Nairobi. Accessed January 22, 2021. http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/23348.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Oriedi, David O. “A model for supporting decisions using multi-agent systems co-operation: a simulation of donor funding in health environment .” 2011. Web. 22 Jan 2021.

Vancouver:

Oriedi DO. A model for supporting decisions using multi-agent systems co-operation: a simulation of donor funding in health environment . [Internet] [Thesis]. University of Nairobi; 2011. [cited 2021 Jan 22]. Available from: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/23348.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Oriedi DO. A model for supporting decisions using multi-agent systems co-operation: a simulation of donor funding in health environment . [Thesis]. University of Nairobi; 2011. Available from: http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/23348

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

30. Rigney, Stacey. Mathematical modelling of energy storage and return prostheses.

Degree: Graduate School of Biomedical Engineering, 2018, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/59548 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48794/SOURCE02?view=true

► Lower-limb energy storage and return (ESAR) prostheses are constructed of carbon-fibre composite to approximately replicate the lower-limb of an able-bodied athlete during the stance phase… (more)

▼ Lower-limb energy storage and return (ESAR) prostheses are constructed of carbon-fibre composite to approximately replicate the lower-limb of an able-bodied athlete during the stance phase of dynamic activities, such as running and jumping. However, the dynamic properties of ESAR prostheses means they adhere poorly to the underlying rigid body assumptions of conventional link segment models, and the associated impact on calculated mechanical behaviour is not well documented. As such, the purpose of this thesis was to investigate the types and limitations of existing mathematical models of lower-limb prostheses, and then develop alternative models of ESAR prosthesis mechanical behaviour - both independent from and during gait.Firstly, mathematical models of prosthetic feet independent from gait were developed. Finite element (FE) models of four ESAR prostheses were developed from mechanical testing, presenting a new and robust method of comparing the dynamic behaviour of different ESAR prostheses without resorting to destructive testing. To describe prosthesis behaviour with reduced computational cost compared to FE models, three lumped-parameter models of four ESAR prostheses were also developed that enable the simulation of ground reaction force for a given prosthesis translation and rotation. Mathematical models of prosthesis behaviour during gait were then developed. A multibody FE model was proposed, using experimental marker trajectories to prescribe the displacement of the rigid skeletal bodies as well as the proximal and distal ends of the prosthesis. Additionally, the effect of a link segment model’s marker-set and geometry on calculated lower-limb kinematics, kinetics and energetics during amputee sprinting was investigated. Five different link segment models of the Ottobock 1E90 Sprinter were developed and statistically compared. The results indicated that the omission of prosthesis-specific spatial, inertial and elastic properties from full-body models significantly influence the calculated amputee gait characteristics. The newly developed methodologies enable the analysis of ESAR prostheses without using a two-link segment model to describe the mechanical behaviour. This research has the potential to optimise sporting technique as well as to provide more accurate data for health care professionals, improving the athletic performance and well-being of individuals with lower-limb amputation. Advisors/Committee Members: Simmons, Anne, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Finite element; Biomechanics; Composite materials; Gait analysis; Spring model; Numerical model; Inverse dynamics; Joint kinematics; Lower-limb amputees; Lumped-parameter model; Mechanical testing; Motion capture; Prosthetics; Solid mechanics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rigney, S. (2018). Mathematical modelling of energy storage and return prostheses. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/59548 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48794/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Rigney, Stacey. “Mathematical modelling of energy storage and return prostheses.” 2018. Doctoral Dissertation, University of New South Wales. Accessed January 22, 2021. http://handle.unsw.edu.au/1959.4/59548 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48794/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Rigney, Stacey. “Mathematical modelling of energy storage and return prostheses.” 2018. Web. 22 Jan 2021.

Vancouver:

Rigney S. Mathematical modelling of energy storage and return prostheses. [Internet] [Doctoral dissertation]. University of New South Wales; 2018. [cited 2021 Jan 22]. Available from: http://handle.unsw.edu.au/1959.4/59548 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48794/SOURCE02?view=true.

Council of Science Editors:

Rigney S. Mathematical modelling of energy storage and return prostheses. [Doctoral Dissertation]. University of New South Wales; 2018. Available from: http://handle.unsw.edu.au/1959.4/59548 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:48794/SOURCE02?view=true

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Open Access Theses and Dissertations