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Contribution A La Modelisation Des Pertes Fer Dans Les Machines Electriques Tournantes
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Book Synopsis Contribution à la prise en compte des pertes fer dans la modélisation des machines électriques par éléments finis by : Mircea Frăţilă
Download or read book Contribution à la prise en compte des pertes fer dans la modélisation des machines électriques par éléments finis written by Mircea Frăţilă and published by . This book was released on 2012 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: La prise en compte des pertes fer dans les machines électriques est une étape cruciale lors du processus de conception. L’objectif de ce travail a donc été de valider l’implémentation d’un modèle de pertes fer tout en effectuant une modélisation précise des machines électriques étudiées. Le choix s’est porté sur l’utilisation de modèles de calcul des pertes en post-traitement d’un code par éléments finis. Ainsi, différents modèles analytiques ont été comparés en régime sinusoïdal et non sinusoïdal (sans cycles mineurs) en termes de précision, afin de choisir le plus adapté pour une implantation dans code_Carmel. Par ailleurs, nous avons montré que la prise en compte des cycles mineurs peut être améliorée en remplaçant le terme classique de Steinmetz par un modèle d’hystérésis ou par un modèle analytique adapté. L’implémentation et la précision du modèle analytique ont été évaluées d’abord sur des systèmes simples puis sur plusieurs machines tournantes. La comparaison des résultats simulés avec les mesures issues des essais à vide montre une bonne concordance et démontre la capacité du modèle à estimer les pertes fer avec une bonne précision pour une large gamme de machines électriques et pour les deux types d’alimentations utilisés (sinusoïdale et MLI).
Book Synopsis Estimation des pertes fer dans les machines électriques by : Thierry Gautreau
Download or read book Estimation des pertes fer dans les machines électriques written by Thierry Gautreau and published by . This book was released on 2005 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suite aux directives européennes incitant les constructeurs de moteurs électriques à supprimer de leur offre, les moteurs à faible rendement, une politique de conception de moteurs à haut rendement est engagée. Toutefois, l'évaluation préalable, en simulation, de ce paramètre, et notamment des pertes fer de la machine reste aujourd'hui un problème difficile. Dans cette optique, depuis quelques années, un modèle, nommé " Loss Surface ", de calcul a posteriori des pertes fer sous le logiciel éléments finis Flux2DTM a été développé. Au cours de ce travail, plusieurs améliorations sont apportées à ce modèle LS. Un nouveau banc de caractérisation à partir d'un onduleur de tension performant a permis de prolonger en fréquence la surface dynamique LS. Une nouvelle formulation de l'identification de la contribution dynamique, plus simple, a également été réalisée. Au final, les gains apportés sont conséquents. Deux machines synchrones à aimants aux caractéristiques très différentes ont ensuite été utilisées pour évaluer les améliorations sur des structures complexes. La première machine, nous a permis de tester l'impact du niveau d'induction sur l'évolution des pertes fer, et la seconde machine, l'influence de la fréquence. Deux phénomènes physiques importants ont également été étudiés afin de connaître leurs contributions aux pertes d'origine magnétique : les pertes par courants induits dans un matériau massif tel qu'un aimant, et l'effet sur les propriétés magnétiques des contraintes mécaniques induites par le poinçonnage du circuit magnétique.
Download or read book Journal de Physique written by and published by . This book was released on 1991 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution a la modelisation et a l'estimation parametrique des machines electriques a courant alternatif : application au diagnostic by : Sandrine Moreau
Download or read book Contribution a la modelisation et a l'estimation parametrique des machines electriques a courant alternatif : application au diagnostic written by Sandrine Moreau and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Matériaux magnétiques : progrès et perspectives by :
Download or read book Matériaux magnétiques : progrès et perspectives written by and published by . This book was released on 1992 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Book Synopsis Handbook of Electric Machines by : S. A. Nasar
Download or read book Handbook of Electric Machines written by S. A. Nasar and published by McGraw-Hill Companies. This book was released on 1987 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Faecal Sludge Management by : Linda Strande
Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
Book Synopsis A Voyage Through Turbulence by : Peter A. Davidson
Download or read book A Voyage Through Turbulence written by Peter A. Davidson and published by Cambridge University Press. This book was released on 2011-09-08 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence is widely recognized as one of the outstanding problems of the physical sciences, but it still remains only partially understood despite having attracted the sustained efforts of many leading scientists for well over a century. In A Voyage Through Turbulence we are transported through a crucial period of the history of the subject via biographies of twelve of its great personalities, starting with Osborne Reynolds and his pioneering work of the 1880s. This book will provide absorbing reading for every scientist, mathematician and engineer interested in the history and culture of turbulence, as background to the intense challenges that this universal phenomenon still presents.
Author :International Atomic Energy Agency Publisher :International Atomic Energy Agency ISBN 13 :9789201063205 Total Pages :72 pages Book Rating :4.0/5 (632 download)
Book Synopsis In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 by : International Atomic Energy Agency
Download or read book In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Book Synopsis Modern Surface Organometallic Chemistry by : Jean-Marie Basset
Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.
Book Synopsis Measurement in Fluid Mechanics by : Stavros Tavoularis
Download or read book Measurement in Fluid Mechanics written by Stavros Tavoularis and published by Cambridge University Press. This book was released on 2005-10-24 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurement in Fluid Mechanics is an introductory, general reference in experimental fluid mechanics, featuring classical and state-of-the-art methods for flow visualization, flow rate measurement, pressure, velocity, temperature, concentration and wall shear stress. Suitable as a textbook for graduate and advanced undergraduate courses, and for practising engineers and applied scientists.
Book Synopsis Elementary Fluid Mechanics by : Tsutomu Kambe
Download or read book Elementary Fluid Mechanics written by Tsutomu Kambe and published by World Scientific. This book was released on 2007 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook describes the fundamental OC physicalOCO aspects of fluid flows for beginners of fluid mechanics in physics, mathematics and engineering, from the point of view of modern physics. It also emphasizes the dynamical aspects of fluid motions rather than the static aspects, illustrating vortex motions, waves, geophysical flows, chaos and turbulence. Beginning with the fundamental concepts of the nature of flows and the properties of fluids, the book presents fundamental conservation equations of mass, momentum and energy, and the equations of motion for both inviscid and viscous fluids. In addition to the fundamentals, this book also covers water waves and sound waves, vortex motions, geophysical flows, nonlinear instability, chaos, and turbulence. Furthermore, it includes the chapters on superfluids and the gauge theory of fluid flows. The material in the book emerged from the lecture notes for an intensive course on Elementary Fluid Mechanics for both undergraduate and postgraduate students of theoretical physics given in 2003 and 2004 at the Nankai Institute of Mathematics (Tianjin) in China. Hence, each chapter may be presented separately as a single lecture."
Book Synopsis Modern Power Systems by : Linda Morand
Download or read book Modern Power Systems written by Linda Morand and published by . This book was released on 2016-05-26 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy efficiency and sustainable technologies are becoming a necessity with the passage of time. This has increased the scope of modern technologies to a large extent. This book elucidates the concepts and innovative models around prospective developments with respect to the modern power systems. The topics included herein like smart grid technologies, sustainable electric power, clean energy, etc. are of utmost significance and bound to provide incredible insights to readers about the construction and working of modern power systems, their efficiency and impact on the environment. This book is most suitable for graduate and post graduate engineering students and research scholars.
Book Synopsis Saints of the Atlas by : Ernest Gellner
Download or read book Saints of the Atlas written by Ernest Gellner and published by ACLS History E-Book Project. This book was released on 2008-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Creating Futures written by Michel Godet and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulence written by Peter Davidson and published by Oxford University Press, USA. This book was released on 2015 with total page 647 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an advanced textbook on the subject of turbulence, and is suitable for engineers, physical scientists and applied mathematicians. The aim of the book is to bridge the gap between the elementary accounts of turbulence found in undergraduate texts, and the more rigorous monographs on the subject. Throughout, the book combines the maximum of physical insight with the minimum of mathematical detail. Chapters 1 to 5 may be appropriate as background material for an advanced undergraduate or introductory postgraduate course on turbulence, while chapters 6 to 10 may be suitable as background material for an advanced postgraduate course on turbulence, or act as a reference source for professional researchers. This second edition covers a decade of advancement in the field, streamlining the original content while updating the sections where the subject has moved on. The expanded content includes large-scale dynamics, stratified & rotating turbulence, the increased power of direct numerical simulation, two-dimensional turbulence, Magnetohydrodynamics, and turbulence in the core of the Earth
