Download or read book Contribution au diagnostic et a l analyse de d fauts d une machine synchrone aimants permanents written by Kawthar Alameh and published by . This book was released on 2017 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'avènement des aimants permanents et les progrès récents dans l'électronique de puissance ont joué un rôle majeur dans l'évolution de la motorisation électrique des véhicules. Actuellement, les machines synchrones à aimants permanents (MSAP) grâce à leurs performances, et surtout leur efficacité énergétique, sont considérées comme les candidats idéaux pour les chaînes de traction des véhicules hybrides et électriques. Toutefois, en raison du vieillissement des matériaux, des défauts de fabrication ou des conditions de fonctionnement assez sévères, différents types de défauts sont capables de survenir dans les composants de la machine, ses organes de commande ou de mesure. Pour répondre aux exigences de sûreté, de fiabilité et de disponibilité, l'intégration d'une approche de surveillance et de diagnostic de défauts, dans le groupe motopropulseur électrique automobile, devient de plus en plus primordiale. Dans ce contexte, l'objectif de la thèse est de contribuer au diagnostic et à la caractérisation de défauts dans la MSAP par une analyse vibratoire. En premier temps, des approches analytiques de modélisation de la MSAP et des défauts : de court-circuit inter-spires, d'excentricité et de démagnétisation rotoriques serontproposées. L'intérêt majeur de tels modèles, dans le cadre du diagnostic, est d'étudier le comportement de la machine en présence de défauts étudiés afin d'en déduire les méthodes de détection les plus adaptées. En outre, des modèles numériques seront développés afin de les confronter aux parties magnétique et mécanique analytiques de la machine ainsi qu'au défaut de démagnétisation. Dans la phase d'analyse des impacts de défauts, nous allons nous focaliser sur les cas d'excentricité et de démagnétisation rotoriques. Les indicateurs de défauts seront extraits des représentations du signal vibratoire dans le temps et l'espace et de leurs transformées de Fourier, pour les cas de défauts simples et les cas de deux défauts combinés. Pour les cas simples, deux approches de localisation seront proposées : la première utilise le principe de tests statistiques et de tables de signatures, inspirée des méthodes de diagnostic à base de modèles, alors que la deuxième repose sur un banc de trois réseaux de neurones, où chacun est à une entrée et une sortie et destiné à localiser un type de défaut. Enfin, les performances des deux approches, en termes de robustesse et d'adaptabilité, seront comparées pour les mêmes ensembles de seuillage/d'apprentissage et de test.
Download or read book Proceedings of the 4th International Conference on Electrical Engineering and Control Applications written by Sofiane Bououden and published by Springer Nature. This book was released on 2020-09-29 with total page 1257 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers papers presented during the 4th International Conference on Electrical Engineering and Control Applications. It covers new control system models, troubleshooting tips and complex system requirements, such as increased speed, precision and remote capabilities. Additionally, the papers discuss not only the engineering aspects of signal processing and various practical issues in the broad field of information transmission, but also novel technologies for communication networks and modern antenna design. This book is intended for researchers, engineers and advanced postgraduate students in the fields of control and electrical engineering, computer science and signal processing, as well as mechanical and chemical engineering.
Download or read book Contribution l tude des machines synchrones aimants permanents en pr sence de d fauts inter spires written by Nicolas Leboeuf and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les systèmes électriques embarqués dans l'aéronautique doivent satisfaire à des cahiers des charges de plus en plus exigeants portant sur le poids, les performances et la fiabilité, d'où l'utilisation des Machines Synchrones à Aimants Permanents (MSAP). Vu les contraintes imposées, les prototypes sont parfois assez éloignés d'une MSAP classique. La surveillance en ligne de ces systèmes est alors plus délicate mais représente un enjeu considérable vu l'aspect critique des applications (ailerons d'avion, freinage...) et a pour objectif d'éviter un incident majeur en le détectant puis en basculant sur un système identique redondé. Ce document propose un travail de modélisation de MSAP saine et en présence de défaut inter-spires ayant pour objectif de définir des méthodes de détections de défauts inter-spires en ligne, sans capteurs supplémentaires. Deux approches sont présentées pour modéliser les MSAP en présence de défauts inter-spires et sont comparées à des essais expérimentaux réalisés sur un prototype aéronautique. L'une d'entre elles, reposant sur une approche par Réseaux De Perméances (RDP), permet d'obtenir le meilleur compromis. La partie suivante propose de tester deux approches utilisant un indicateur de défaut basé sur un modèle d'Onduleur-MSAP sain et montre l'intérêt de ce type d'approche comparé à des approches plus classiques. L'ensemble des indicateurs développés est ensuite analysé à l'aide d'un outil utilisant la Reconnaissance de Formes (RDF).
Download or read book Contribution l tude et au diagnostic de la machine asynchrone written by Ai͏̈cha Abed and published by . This book was released on 2002 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Utilisée dans la plupart des entraînements électriques, la machine asynchrone tend à supplanter la machine à courant continu ainsi que la machine synchrone en raison de ses nombreuses qualités, et principalement de son faible coût et de sa robustesse. Ainsi, une réflexion générale est engagée en matière de modélisation et de diagnostic des défauts stator/rotor. Plus particulièrement, nous proposons d'étudier les défauts rotoriques (ruptures des barres au rotor). En premier temps, nous développons deux modèles de la machine asynchrone pour la simulation des ruptures de barres rotoriques. Nous présentons dans la suite trois méthodes pour la détection de ce défaut. Le principe de la détection est basé sur l'analyse spectrale du courant statorique afin de suivre l'évolution des fréquences liées au défaut. Enfin, une étude du défaut en présence d'une commande vectorielle classique est présentée ouvrant une nouvelle voie vers un diagnostic dans le cas d'une vitesse variable. Une partie expérimentale a permis de vérifier l'exactitude des résultats théoriques et a montré l'efficacité des méthodes développées.
Download or read book Surveillance et diagnostic des machines synchrones aimants permanents written by Makara Khov and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse traite du problème de surveillance en ligne de défaillances électriques dans les entrainements électriques à base de machines synchrones à aimants permanents (MSAP) par une méthode de suivi paramétrique. Les défauts de court-circuit entre spires au stator sont souvent critiques et doivent être détectés au plus tôt avec un bon taux de confiance afin d'informer un système superviseur de la présence d'une défaillance pour limiter les risques encourues par l'environnement matériel et humain situé autour de la machine en défaut. La méthode que nous proposons de mettre en œuvre pour la détection des courts-circuits statoriques est basée des techniques d'identifications récursives. Nous proposons d'identifier en ligne les paramètres d'un modèle diphasé électrique de l'actionneur synchrone et d'analyser les variations des paramètres identifiées lors de l'apparition d'un défaut. Pour assurer les performances des méthodes d'identification, il est souvent nécessaire de disposer d'un signal d'excitation additionnel pour assurer les bonnes performances des algorithmes. Ces signaux peuvent cependant perturber le fonctionnement normal de la machine et entrainer des pertes additionnelles. Dans ce contexte, nous proposons une approche par identification faisant appel à un modèle diphasé spécifique appelé « le repère de Park à courants orientés ». Ce repère permet, tout en réduisant la complexité du problème d'identification, d'obtenir des propriétés d'auto-excitation intéressantes et donc d'éviter l'utilisation d'une excitation additionnelle. Des simulations sont menées à l'aide d'un modèle fin de la machine permettant de reproduire des situations de défaillances de manière virtuelle et d'éprouver l'efficacité des algorithmes dans ces situations dégradées. Cette machine, pouvant fonctionner en générateur ou en moteur, est intégrée dans un environnement complet, incluant le cas échéant une alimentation, une charge mécanique et éventuellement une commande, ce qui permet également de tester les algorithmes pour des fonctionnements en boucle ouverte et en boucle fermée. Les résultats présentés permettent de valider les techniques proposées et montrent qu'elles permettent d'extraire automatiquement, à partir des variations des paramètres identifiés, un indicateur de défaut. Des résultats expérimentaux sont également présentés en fonctionnement générateur sur une machine spécialement re-bobinée pour permettre la réalisation de défaut statoriques. Les algorithmes sont implantés sur une cible de calcul numérique afin de démontrer la faisabilité temps réelle de la détection.
Download or read book Design of Rotating Electrical Machines written by Juha Pyrhonen and published by John Wiley & Sons. This book was released on 2013-09-26 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: In one complete volume, this essential reference presents an in-depth overview of the theoretical principles and techniques of electrical machine design. This timely new edition offers up-to-date theory and guidelines for the design of electrical machines, taking into account recent advances in permanent magnet machines as well as synchronous reluctance machines. New coverage includes: Brand new material on the ecological impact of the motors, covering the eco-design principles of rotating electrical machines An expanded section on the design of permanent magnet synchronous machines, now reporting on the design of tooth-coil, high-torque permanent magnet machines and their properties Large updates and new material on synchronous reluctance machines, air-gap inductance, losses in and resistivity of permanent magnets (PM), operating point of loaded PM circuit, PM machine design, and minimizing the losses in electrical machines> End-of-chapter exercises and new direct design examples with methods and solutions to real design problems> A supplementary website hosts two machine design examples created with MATHCAD: rotor surface magnet permanent magnet machine and squirrel cage induction machine calculations. Also a MATLAB code for optimizing the design of an induction motor is provided Outlining a step-by-step sequence of machine design, this book enables electrical machine designers to design rotating electrical machines. With a thorough treatment of all existing and emerging technologies in the field, it is a useful manual for professionals working in the diagnosis of electrical machines and drives. A rigorous introduction to the theoretical principles and techniques makes the book invaluable to senior electrical engineering students, postgraduates, researchers and university lecturers involved in electrical drives technology and electromechanical energy conversion.
Download or read book Prognostics written by Kai Goebel and published by Createspace Independent Publishing Platform. This book was released on 2017-04-03 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prognostics is the science of making predictions of engineering systems. It is part of a suite of techniques that determine whether a system is behaving within nominal operational performance and - if it does not - that determine what is wrong and how long it will take until the system no longer fulfills certain functional requirements. This book presents the latest developments and research findings on the topic of prognostics by the Prognostics Center of Excellence at NASA Ames Research Center. The book is intended to provide a practitioner with an understanding of the foundational concepts as well as practical tools to perform prognostics and health management on different types of engineering systems and in particular to predict remaining useful life.
Download or read book Brushless Permanent Magnet Motor Design written by Duane C. Hanselman and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explaining techniques for magnetic modelling and circuit analysis, this book shows how magnetic circuit analysis applies to motor design. It describes the major aspects of motor operation and design, and develops design equations for radial flux and axial flux motors. It is intended for electrical, electronics and mechanical engineers.
Download or read book Unmanned Aircraft Systems written by Ella Atkins and published by John Wiley & Sons. This book was released on 2017-01-17 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt: UNMANNED AIRCRAF T SYSTEMS UNMANNED AIRCRAF T SYSTEMS An unmanned aircraft system (UAS), sometimes called a drone, is an aircraft without a human pilot on board ??? instead, the UAS can be controlled by an operator station on the ground or may be autonomous in operation. UAS are capable of addressing a broad range of applications in diverse, complex environments. Traditionally employed in mainly military applications, recent regulatory changes around the world are leading to an explosion of interest and wide-ranging new applications for UAS in civil airspace. Covering the design, development, operation, and mission profiles of unmanned aircraft systems, this single, comprehensive volume forms a complete, stand-alone reference on the topic. The volume integrates with the online Wiley Encyclopedia of Aerospace Engineering, providing many new and updated articles for existing subscribers to that work. The chapters cover the following items: Airframe configurations and design (launch systems, power generation, propulsion) Operations (missions, integration issues, and airspace access) Coordination (multivehicle cooperation and human oversight) With contributions from leading experts, this volume is intended to be a valuable addition, and a useful resource, for aerospace manufacturers and suppliers, governmental and industrial aerospace research establishments, airline and aviation industries, university engineering and science departments, and industry analysts, consultants, and researchers.
Download or read book Control in Power Electronics written by Marian P. Kazmierkowski and published by Elsevier. This book was released on 2002-08-30 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors were originally brought together to share research and applications through the international Danfoss Professor Programme at Aalborg University in Denmark. Personal computers would be unwieldy and inefficient without power electronic dc supplies. Portable communication devices and computers would also be impractical. High-performance lighting systems, motor controls, and a wide range of industrial controls depend on power electronics. In the near future we can expect strong growth in automotive applications, dc power supplies for communication systems, portable applications, and high-end converters. We are approaching a time when all electrical energy will be processed and controlled through power electronics somewhere in the path from generation to end use. The most up-to-date information available is presented in the text Written by a world renowned leader in the field
Download or read book Model Based Control of a Robot Manipulator written by Chae H. An and published by MIT Press (MA). This book was released on 1988-03-01 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first integrated treatment of many of the most important recent developments in using detailed dynamic models of robots to improve their control.
Download or read book Electric Machines written by Hamid A. Toliyat and published by CRC Press. This book was released on 2017-12-19 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: With countless electric motors being used in daily life, in everything from transportation and medical treatment to military operation and communication, unexpected failures can lead to the loss of valuable human life or a costly standstill in industry. To prevent this, it is important to precisely detect or continuously monitor the working condition of a motor. Electric Machines: Modeling, Condition Monitoring, and Fault Diagnosis reviews diagnosis technologies and provides an application guide for readers who want to research, develop, and implement a more effective fault diagnosis and condition monitoring scheme—thus improving safety and reliability in electric motor operation. It also supplies a solid foundation in the fundamentals of fault cause and effect. Combines Theoretical Analysis and Practical Application Written by experts in electrical engineering, the book approaches the fault diagnosis of electrical motors through the process of theoretical analysis and practical application. It begins by explaining how to analyze the fundamentals of machine failure using the winding functions method, the magnetic equivalent circuit method, and finite element analysis. It then examines how to implement fault diagnosis using techniques such as the motor current signature analysis (MCSA) method, frequency domain method, model-based techniques, and a pattern recognition scheme. Emphasizing the MCSA implementation method, the authors discuss robust signal processing techniques and the implementation of reference-frame-theory-based fault diagnosis for hybrid vehicles. Fault Modeling, Diagnosis, and Implementation in One Volume Based on years of research and development at the Electrical Machines & Power Electronics (EMPE) Laboratory at Texas A&M University, this book describes practical analysis and implementation strategies that readers can use in their work. It brings together, in one volume, the fundamentals of motor fault conditions, advanced fault modeling theory, fault diagnosis techniques, and low-cost DSP-based fault diagnosis implementation strategies.
Download or read book On line Estimation and Adaptive Control of Bioreactors written by G. Bastin and published by Elsevier. This book was released on 2013-10-22 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with monitoring and control of biotechnological processes. Different methods are proposed which are based on the nonlinear structure of the process and do not require any a priori knowledge of the fermentation parameters. The theoretical stability and convergence properties of the proposed algorithms are analysed and their performances are illustrated by simulation results and, in many instances, by real life experiments. The concept of software sensors is introduced; these are algorithms based on the nonlinear model of the process and designed for on-line estimation of the biological variables and/or the fermentation parameters. In order to deal with process nonstationarities and parameter uncertainties, reference is made to adaptive estimation and control techniques.The book is the result of an intensive joint research effort by the authors during the last decade. It is intended as a graduate level text for students of bioengineering as well as a reference text for scientists and engineers involved in the design and optimization of bioprocesses.
Download or read book Technocratic Dreaming written by Paul James and published by . This book was released on 1990 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technocratic dreaming of very fast trains and Japanese designer cities.
Download or read book Semigroups for Delay Equations written by András Bátkai and published by A K Peters, Ltd.. This book was released on 2005 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: In most physical, chemical, biological and economic phenomena it is quite natural to assume that the system not only depends on the present state but also on past occurrences. These circumstances are mathematically described by partial differential equations with delay. This book presents, in a systematic fashion, how delay equations can be studied in Lp-history spaces.Appendices offering supplementary information and a comprehensive index make this book an ideal introduction and research tool for mathematicians, chemists, biologists and economists.
Download or read book One Parameter Semigroups for Linear Evolution Equations written by Klaus-Jochen Engel and published by Springer Science & Business Media. This book was released on 2006-04-06 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the theory of strongly continuous one-parameter semigroups of linear operators. A special feature of the text is an unusually wide range of applications such as to ordinary and partial differential operators, to delay and Volterra equations, and to control theory. Also, the book places an emphasis on philosophical motivation and the historical background.
Download or read book Geometric Control Theory written by Velimir Jurdjevic and published by Cambridge University Press. This book was released on 1997 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geometric control theory is concerned with the evolution of systems subject to physical laws but having some degree of freedom through which motion is to be controlled. This book describes the mathematical theory inspired by the irreversible nature of time evolving events. The first part of the book deals with the issue of being able to steer the system from any point of departure to any desired destination. The second part deals with optimal control, the question of finding the best possible course. An overlap with mathematical physics is demonstrated by the Maximum principle, a fundamental principle of optimality arising from geometric control, which is applied to time-evolving systems governed by physics as well as to man-made systems governed by controls. Applications are drawn from geometry, mechanics, and control of dynamical systems. The geometric language in which the results are expressed allows clear visual interpretations and makes the book accessible to physicists and engineers as well as to mathematicians.
