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You searched for subject:(Auxiliary Signal). Showing records 1 – 2 of 2 total matches.

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1. Esna Ashari Esfahani, Alireza. Détection active de pannes dans les systèmes dynamiques en boucle fermée : Active fault detection in closed-loop dynamic systems.

Degree: Docteur es, Automatique, 2010, Université Paris-Est

L'objectif de cette thèse est de développer une nouvelle méthodologie pour la détection active de défaillances, basée sur approche multimodèle et robuste des fautes. Ce travail prolonge des recherches effectuées dans le projet Metalau de l'Inria. L'apport essentiel de cette thèse est la prise en compte de modèles évoluant en boucle fermée. On utilise une approche multi-modèle pour modéliser le modèle en fonctionnement normal et le modèle défaillant. Les avantages potentiels de l'utilisation d'un feedback dynamique linéaire et ses propriétés de robustesse sont analysés dans la construction de signaux de détection auxiliaires. On compare les résultats obtenus avec ceux du cas boucle ouverte. La formulation du problème de détection active dans le cas d'un modèle en boucle fermée est nouvelle et repose sur la prise en considération de la norme du signal de détection auxiliaire comme critère d'optimisation. On considère aussi des fonctions coût plus générales, telles celles qui sont utilisées pour mesurer la performance de feedbacks dans des problèmes de la théorie de la commande linéaire robuste. La solution complète repose sur la résolution de plusieurs problèmes d'optimisation non standards

The aim is to develop a novel theory of robust active failure detection based on multi-model formulation of faults. The original method was already proposed by the Metalau group of INRIA. We have continued to work on the extension of this approach to more general cases. The focus is on the effects of feedback on the previous approach. The multi-model approach is still used to model the normal and the failed systems; however the possible advantages of using linear dynamic feedback in the construction of the auxiliary signal for robust fault detection is considered and the results are compared to the previously developed open-loop setup. An original formulation of the active fault detection problem using feedback is developed. The norm of the auxiliary signal is considered as a possible cost criterion. Also, we have considered a more general cost function that has already been used for measuring the performance of feedback configurations in Linear Control Theory. We have given a complete solution to this problem. In order to find a complete solution, several mathematical problems are solved

Advisors/Committee Members: Candau, Yves (thesis director).

Subjects/Keywords: Détection de pannes; Programmation dynamique; Équation de Riccati; Optimisation convexe; Feedback; Signal auxiliaire; Fault Detection; Dynamic Programming; Riccati Equation; Convex Optimization; Feedback; Auxiliary Signal

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

APA (6th Edition):

Esna Ashari Esfahani, A. (2010). Détection active de pannes dans les systèmes dynamiques en boucle fermée : Active fault detection in closed-loop dynamic systems. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2010PEST1060

Chicago Manual of Style (16th Edition):

Esna Ashari Esfahani, Alireza. “Détection active de pannes dans les systèmes dynamiques en boucle fermée : Active fault detection in closed-loop dynamic systems.” 2010. Doctoral Dissertation, Université Paris-Est. Accessed November 19, 2017. http://www.theses.fr/2010PEST1060.

MLA Handbook (7th Edition):

Esna Ashari Esfahani, Alireza. “Détection active de pannes dans les systèmes dynamiques en boucle fermée : Active fault detection in closed-loop dynamic systems.” 2010. Web. 19 Nov 2017.

Vancouver:

Esna Ashari Esfahani A. Détection active de pannes dans les systèmes dynamiques en boucle fermée : Active fault detection in closed-loop dynamic systems. [Internet] [Doctoral dissertation]. Université Paris-Est; 2010. [cited 2017 Nov 19]. Available from: http://www.theses.fr/2010PEST1060.

Council of Science Editors:

Esna Ashari Esfahani A. Détection active de pannes dans les systèmes dynamiques en boucle fermée : Active fault detection in closed-loop dynamic systems. [Doctoral Dissertation]. Université Paris-Est; 2010. Available from: http://www.theses.fr/2010PEST1060


Laurentian University

2. Levesque, Michelle. An improved energy management methodology for the mining industry.

Degree: 2015, Laurentian University

The focus for this work was the development of an improved energy management methodology tailored for the mining sector. Motivation for this research was driven by perception of slow progress in adoption of energy management practices to improve energy performance within the mining sector. Energy audits conducted for an underground mine, a mineral processing facility, and a pyrometallurgical process were reviewed and recommendations for improved data gathering, reporting and interpretation were identified. An obstacle for conducting energy audits in mines without extensive sub-metering is a lack of disaggregated data indicating end use. Thus a novel method was developed using signal processing techniques to disaggregate the end-use electricity consumption, exemplified through isolation of a mine hoist signal from the main electricity meter data. Further refinements to the method may lead to its widespread adoption, which may lower energy auditing costs via a reduced number of meters and infrastructure, as well as lower data storage requirements. Mine ventilation systems correspond to the largest energy demand center for underground mines. Thus a detailed analysis ensued with the development of a techno-economic model that could be used to assess various fan and duct options. Furthermore, the need for a standardized methodology for determination of duct friction factors from ventilation surveys was proposed, which included a method to verify the validity of the resulting value from asperity height measurements. A method was also suggested for determination of leakage and duct friction factor values from ventilation survey data. Dissemination of best practice is a strategy that could be employed to improve energy performance throughout the mining sector, thus a Best Practice database was developed to iv improve communication and provide a standardized reporting framework for sharing of energy conservation initiatives. Demonstration of continuous improvement is an underpinning element of the ISO 50001 energy management standard but as mines extract ore from deeper levels energy use increases. Thus ensued the development of a benchmarking metric, with the use of appropriate support variables that included mine depth, production, and climate data, that demonstrated the benefit of implemented energy conservation measures for an underground mine. The development of an ultimate energy management methodology for all stages of mineral processing from ‘Mine to Bullion’ is beyond the scope of this work. However, this research has resulted in several recommendations for improvement and identified areas for further improvements.

Subjects/Keywords: energy management; energy audits; mining industry; energy reporting; energy benchmarking; auxiliary mine ventilation; dissemination of best practice energy management; signal processing; electricity disaggregation

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

APA (6th Edition):

Levesque, M. (2015). An improved energy management methodology for the mining industry. (Thesis). Laurentian University. Retrieved from https://zone.biblio.laurentian.ca/dspace/handle/10219/2473

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

Chicago Manual of Style (16th Edition):

Levesque, Michelle. “An improved energy management methodology for the mining industry. ” 2015. Thesis, Laurentian University. Accessed November 19, 2017. https://zone.biblio.laurentian.ca/dspace/handle/10219/2473.

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

MLA Handbook (7th Edition):

Levesque, Michelle. “An improved energy management methodology for the mining industry. ” 2015. Web. 19 Nov 2017.

Vancouver:

Levesque M. An improved energy management methodology for the mining industry. [Internet] [Thesis]. Laurentian University; 2015. [cited 2017 Nov 19]. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2473.

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

Council of Science Editors:

Levesque M. An improved energy management methodology for the mining industry. [Thesis]. Laurentian University; 2015. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2473

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

.