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Diagnostic Des Machines Electriques Par Fusion Dinformations
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Book Synopsis Diagnostic des machines électriques par fusion d'informations by : Miftah Aldwiab Abubaker Irhoumah
Download or read book Diagnostic des machines électriques par fusion d'informations written by Miftah Aldwiab Abubaker Irhoumah and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de cette thèse est de montrer l'apport de méthodes de fusion pour améliorer la détection de défauts de courts-circuits entre spires du bobinage statorique de machines asynchrones et synchrones avec une analyse du champ extérieur. Dans ces travaux, nous avons cherché à améliorer l'analyse des signaux fournis par plusieurs capteurs placés autour dela machine par l'utilisation de méthodes de fusion dans le cadre de la théorie des fonctions de croyance. La fusion s'effectue à deux niveaux, tout d'abord, sur des indicateurs extraits des variations des amplitudes des harmoniques sensibles mesurées par deux capteurs placés autour de la machine, à 180° l'un de l'autre, en fonction des variations de charge. Nous avons plus particulièrement exploité les informations «Sens de Variation d'Amplitude » (SVA) et «Rapport d'Amplitude» (RA) qui sont fusionnées entre eux. Nous avons également défini un coefficient de corrélation qui indique le niveau de corrélation entre les amplitudes mesurées par les deux capteurs lorsque la charge varie. Lorsque la machine estsaine le coefficient de corrélation est proche de 1 ; et il diminue lorsqu'un défaut apparait. L'autre niveau de fusion d'information se situe au niveau des capteurs positionnés autour de la machine sur une ceinture de capteurs. On sait en effet que la détection d'un défaut est plus efficace lorsque les capteurs sont placés dans l'axe de la bobine en défaut. La multiplication des capteurs permet d'augmenter les chances de détection du défaut, en utilisant le formalisme des fonctions de croyance pour modéliser le processus de fusion.
Book Synopsis Electrical Systems 2 by : Abdenour Soualhi
Download or read book Electrical Systems 2 written by Abdenour Soualhi and published by John Wiley & Sons. This book was released on 2020-04-09 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods of diagnosis and prognosis play a key role in the reliability and safety of industrial systems. Failure diagnosis requires the use of suitable sensors, which provide signals that are processed to monitor features (health indicators) for defects. These features are required to distinguish between operating states, in order to inform the operator of the severity level, or even the type, of a failure. Prognosis is defined as the estimation of a system's lifespan, including how long remains and how long has passed. It also encompasses the prediction of impending failures. This is a challenge that many researchers are currently trying to address. Electrical Systems, a book in two volumes, informs readers of the theoretical solutions to this problem, and the results obtained in several laboratories in France, Spain and further afield. To this end, many researchers from the scientific community have contributed to this book to share their research results.
Book Synopsis Méthode globale de diagnostic des machines électriques by : Andrian Ceban
Download or read book Méthode globale de diagnostic des machines électriques written by Andrian Ceban and published by Academiques. This book was released on 2012 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrical Systems 2 by : Abdenour Soualhi
Download or read book Electrical Systems 2 written by Abdenour Soualhi and published by John Wiley & Sons. This book was released on 2020-04-14 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods of diagnosis and prognosis play a key role in the reliability and safety of industrial systems. Failure diagnosis requires the use of suitable sensors, which provide signals that are processed to monitor features (health indicators) for defects. These features are required to distinguish between operating states, in order to inform the operator of the severity level, or even the type, of a failure. Prognosis is defined as the estimation of a systems lifespan, including how long remains and how long has passed. It also encompasses the prediction of impending failures. This is a challenge that many researchers are currently trying to address. Electrical Systems, a book in two volumes, informs readers of the theoretical solutions to this problem, and the results obtained in several laboratories in France, Spain and further afield. To this end, many researchers from the scientific community have contributed to this book to share their research results.
Book Synopsis Contribution au diagnostic de machines électromagnétiques by : Ali Ibrahim
Download or read book Contribution au diagnostic de machines électromagnétiques written by Ali Ibrahim and published by . This book was released on 2009 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse aborde le diagnostic des défauts mécaniques des machines électromécaniques par traitement des signaux électriques (courants et tensions) issus des telles machines et reçus sur un ensemble des capteurs, et essayer d'extraire et de séparer les différentes composantes, électriques ou mécaniques, qui existent. Nous procédons par une modélisation de la machine asynchrone et du défaut de roulement pour expliquer le phénomène physique mis en jeu lors de l'apparition de ce type de défauts. Les outils de traitement du signal dédiés à l'analyse cyclostationnaire peuvent apporter de nouvelles solutions. Nous associons ces outils à l'approche classique de soustraction de bruit qui consiste à retrouver dans un signal donné tout ce qui est dû à un autre signal (mécanique → électrique et électrique → mécanique). Pour valider les études faites sur les signaux électriques, nous traitons aussi les signaux vibratoires. Il est nécessaire de suivre l'influence du défaut tout au long de la chaîne cinématique et d'étudier les transferts des variables mécaniques vers les variables électriques au sein de la machine électrique. La modélisation montre que ce transfert passe à travers la vitesse instantanée, il est donc important de vérifier la présence d'information relative au défaut sur celle-ci. Les défauts de roulement sont ciblés et nos proposons quelques moyens permettant l'utilisation de la vitesse instantanée comme indicateur de défaillances
Book Synopsis Diagnostic des défauts des machines asynchrones par reconnaissance des formes by : Roland Casimir
Download or read book Diagnostic des défauts des machines asynchrones par reconnaissance des formes written by Roland Casimir and published by . This book was released on 2003 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les progrès réalisés en matière d'électronique de puissance, de circuits de commande et en automatique ont contribué à l'utilisation grandissante des machines asynchrones dans les systèmes d'entraînements électriques. Le recours aux machines asynchrones est surtout lié à leur robustesse, leur puissance massique et à leur coût de fabrication. Leur maintenance et leur surveillance permettent de rentabiliser les installations. Il est donc important de développer des outils de diagnostic pour détecter de manière précoce les défauts pouvant apparaître dans ces machines. Notre approche est basée sur l'utilisation des méthodes de reconnaissance des formes. Un vecteur de paramètres, appelé vecteur forme, est extrait de chacune des mesures affectuées sur la machine. Les règles de décisions utilisées permettent de classer les observations, décrites par le vecteur forme, par rapport aux différents modes de fonctionnement connus avec ou sans défaut. Des défauts ont été créés au rotor et au stator de la machine asynchrone, alimentée soit à partir du réseau, soit par le biais d'un onduleur de tension. Les procédures de décisions, basées sur la règle des k - plus proches voisins et sur le calcul direct des frontières, ont été utilisées pour détecter les défauts. Ces algorithmes ont montré l'efficacité de l'application de la reconnaissance des formes au diagnostic.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bioelectromagnetism by : Jaakko Malmivuo
Download or read book Bioelectromagnetism written by Jaakko Malmivuo and published by Oxford University Press, USA. This book was released on 1995 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text applies engineering science and technology to biological cells and tissues that are electrically conducting and excitable. It describes the theory and a wide range of applications in both electric and magnetic fields.
Download or read book Revue Générale Nucléaire written by and published by . This book was released on 2003 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dictionary of Acronyms and Technical Abbreviations by : Jakob Vlietstra
Download or read book Dictionary of Acronyms and Technical Abbreviations written by Jakob Vlietstra and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Dictionary covers information and communication technology (ICT), including hardware and software; information networks, including the Internet and the World Wide Web; automatic control; and ICT-related computer-aided fields. The Dictionary also lists abbreviated names of relevant organizations, conferences, symposia and workshops. This reference is important for all practitioners and users in the areas mentioned above, and those who consult or write technical material. This Second Edition contains 10,000 new entries, for a total of 33,000.
Author :National Academies of Sciences Engineering and Medicine Publisher : ISBN 13 :9780309685382 Total Pages : pages Book Rating :4.6/5 (853 download)
Book Synopsis Bringing Fusion to the U.S. Grid by : National Academies of Sciences Engineering and Medicine
Download or read book Bringing Fusion to the U.S. Grid written by National Academies of Sciences Engineering and Medicine and published by . This book was released on 2021-11-17 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fusion energy offers the prospect of addressing the nation's energy needs and contributing to the transition to a low-carbon emission electrical generation infrastructure. Technology and research results from U.S. investments in the major fusion burning plasma experiment known as ITER, coupled with a strong foundation of research funded by the Department of Energy (DOE), position the United States to begin planning for its first fusion pilot plant. Strong interest from the private sector is an additional motivating factor, as the process of decarbonizing and modernizing the nation's electric infrastructure accelerates and companies seek to lead the way. At the request of DOE, Bringing Fusion to the U.S. Grid builds upon the work of the 2019 report Final Report of the Committee on a Strategic Plan for U.S. Burning Plasma Research to identify the key goals and innovations - independent of confinement concept - that are needed to support the development of a U.S. fusion pilot plant that can serve as a model for producing electricity at the lowest possible capital cost.
Book Synopsis Machinery Condition Monitoring by : Amiya Ranjan Mohanty
Download or read book Machinery Condition Monitoring written by Amiya Ranjan Mohanty and published by CRC Press. This book was released on 2014-12-22 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Find the Fault in the Machines Drawing on the author’s more than two decades of experience with machinery condition monitoring and consulting for industries in India and abroad, Machinery Condition Monitoring: Principles and Practices introduces the practicing engineer to the techniques used to effectively detect and diagnose faults in machines. Providing the working principle behind the instruments, the important elements of machines as well as the technique to understand their conditions, this text presents every available method of machine fault detection occurring in machines in general, and rotating machines in particular. A Single-Source Solution for Practice Machinery Conditioning Monitoring Since vibration is one of the most widely used fault detection techniques, the book offers an assessment of vibration analysis and rotor-dynamics. It also covers the techniques of wear and debris analysis, and motor current signature analysis to detect faults in rotating mechanical systems as well as thermography, the nondestructive test NDT techniques (ultrasonics and radiography), and additional methods. The author includes relevant case studies from his own experience spanning over the past 20 years, and detailing practical fault diagnosis exercises involving various industries ranging from steel and cement plants to gas turbine driven frigates. While mathematics is kept to a minimum, he also provides worked examples and MATLAB® codes. This book contains 15 chapters and provides topical information that includes: A brief overview of the maintenance techniques Fundamentals of machinery vibration and rotor dynamics Basics of signal processing and instrumentation, which are essential for monitoring the health of machines Requirements of vibration monitoring and noise monitoring Electrical machinery faults Thermography for condition monitoring Techniques of wear debris analysis and some of the nondestructive test (NDT) techniques for condition monitoring like ultrasonics and radiography Machine tool condition monitoring Engineering failure analysis Several case studies, mostly on failure analysis, from the author’s consulting experience Machinery Condition Monitoring: Principles and Practices presents the latest techniques in fault diagnosis and prognosis, provides many real-life practical examples, and empowers you to diagnose the faults in machines all on your own.
Download or read book Tokamaks written by John Wesson and published by Oxford University Press. This book was released on 2011-10-13 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: The tokamak is the principal tool in controlled fusion research. This book acts as an introduction to the subject and a basic reference for theory, definitions, equations, and experimental results. The fourth edition has been completely revised, describing their development of tokamaks to the point of producing significant fusion power.
Download or read book Trade Marks Journal written by and published by . This book was released on 1997 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fault Detection and Diagnosis in Industrial Systems by : L.H. Chiang
Download or read book Fault Detection and Diagnosis in Industrial Systems written by L.H. Chiang and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Early and accurate fault detection and diagnosis for modern chemical plants can minimize downtime, increase the safety of plant operations, and reduce manufacturing costs. This book presents the theoretical background and practical techniques for data-driven process monitoring. It demonstrates the application of all the data-driven process monitoring techniques to the Tennessee Eastman plant simulator, and looks at the strengths and weaknesses of each approach in detail. A plant simulator and problems allow readers to apply process monitoring techniques.
Book Synopsis Fundamentals of III-V Semiconductor MOSFETs by : Serge Oktyabrsky
Download or read book Fundamentals of III-V Semiconductor MOSFETs written by Serge Oktyabrsky and published by Springer Science & Business Media. This book was released on 2010-03-16 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of III-V Semiconductor MOSFETs presents the fundamentals and current status of research of compound semiconductor metal-oxide-semiconductor field-effect transistors (MOSFETs) that are envisioned as a future replacement of silicon in digital circuits. The material covered begins with a review of specific properties of III-V semiconductors and available technologies making them attractive to MOSFET technology, such as band-engineered heterostructures, effect of strain, nanoscale control during epitaxial growth. Due to the lack of thermodynamically stable native oxides on III-V's (such as SiO2 on Si), high-k oxides are the natural choice of dielectrics for III-V MOSFETs. The key challenge of the III-V MOSFET technology is a high-quality, thermodynamically stable gate dielectric that passivates the interface states, similar to SiO2 on Si. Several chapters give a detailed description of materials science and electronic behavior of various dielectrics and related interfaces, as well as physics of fabricated devices and MOSFET fabrication technologies. Topics also include recent progress and understanding of various materials systems; specific issues for electrical measurement of gate stacks and FETs with low and wide bandgap channels and high interface trap density; possible paths of integration of different semiconductor materials on Si platform.
Book Synopsis Bosch Automotive Electrics and Automotive Electronics by : Robert Bosch GmbH
Download or read book Bosch Automotive Electrics and Automotive Electronics written by Robert Bosch GmbH and published by Springer Science & Business Media. This book was released on 2013-09-24 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a complete reference guide to automotive electrics and electronics. This new edition of the definitive reference for automotive engineers, compiled by one of the world's largest automotive equipment suppliers, includes new and updated material. As in previous editions different topics are covered in a concise but descriptive way backed up by diagrams, graphs, photographs and tables enabling the reader to better comprehend the subject. This fifth edition revises the classical topics of the vehicle electrical systems such as system architecture, control, components and sensors. There is now greater detail on electronics and their application in the motor vehicle, including electrical energy management (EEM) and discusses the topic of inter system networking within the vehicle. It also includes a description of the concept of hybrid drive a topic that is particularly current due to its ability to reduce fuel consumption and therefore CO2 emissions.This book will benefit automotive engineers and design engineers, automotive technicians in training and mechanics and technicians in garages. It may also be of interest to teachers/ lecturers and students at vocational colleges, and enthusiasts.
