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Author: AHMED.. BATTAS
Publisher:
ISBN:
Category :
Languages : fr
Pages : 324
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Book Description
IL S'AGIT DU CALCUL DU POTENTIEL MAGNETIQUE DANS LES MACHINES ELECTRIQUES TOURNANTES, A PIECES POLAIRES MASSIVES. CE POTENTIEL PERMET DE DETERMINER LES COURANTS DE FOUCAULT QUI APPARAISSENT DANS LES PIECES CONDUCTRICES. DANS UN PREMIER CHAPITRE, LES EQUATIONS DE MAXWELL NOUS CONDUISENT A UNE FORMULATION PARABOLIQUE DU PROBLEME. L'INTRODUCTION DES COMPLEXES, AU DEUXIEME CHAPITRE, NOUS PERMET D'AVOIR UNE FORMULATION ELLIPTIQUE EN REGIME PERMANENT. GRACE A DES CONSIDERATIONS PHYSIQUES, LA RESOLUTION NUMERIQUE PAR UNE METHODE D'ELEMENTS FINIS PEUT ETRE EFFECTUEE SUR UN QUART DE MACHINE. LA METHODE ITERATIVE D'APPROCHE DES COURANTS DE FOUCAULT, DEVELOPPEE AU CHAPITRE III, PERMET, SOUS CERTAINES HYPOTHESES DE CONVERGENCE, DE RETROUVER LES RESULTATS DE LA METHODE COMPLEXE GLOBALE. LE PROGRAMME DE RESOLUTION DE PROBLEME AUX VALEURS PRORES GENERALISEES, PAR LA METHODE DES ITERATIONS DES SOUS ESPACES, DEVELOPPE AU CHAPITRE IV, PERMET DE CONFIRMER LES RESULTATS OBTENUS.
Author: AHMED.. BATTAS
Publisher:
ISBN:
Category :
Languages : fr
Pages : 324
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Book Description
IL S'AGIT DU CALCUL DU POTENTIEL MAGNETIQUE DANS LES MACHINES ELECTRIQUES TOURNANTES, A PIECES POLAIRES MASSIVES. CE POTENTIEL PERMET DE DETERMINER LES COURANTS DE FOUCAULT QUI APPARAISSENT DANS LES PIECES CONDUCTRICES. DANS UN PREMIER CHAPITRE, LES EQUATIONS DE MAXWELL NOUS CONDUISENT A UNE FORMULATION PARABOLIQUE DU PROBLEME. L'INTRODUCTION DES COMPLEXES, AU DEUXIEME CHAPITRE, NOUS PERMET D'AVOIR UNE FORMULATION ELLIPTIQUE EN REGIME PERMANENT. GRACE A DES CONSIDERATIONS PHYSIQUES, LA RESOLUTION NUMERIQUE PAR UNE METHODE D'ELEMENTS FINIS PEUT ETRE EFFECTUEE SUR UN QUART DE MACHINE. LA METHODE ITERATIVE D'APPROCHE DES COURANTS DE FOUCAULT, DEVELOPPEE AU CHAPITRE III, PERMET, SOUS CERTAINES HYPOTHESES DE CONVERGENCE, DE RETROUVER LES RESULTATS DE LA METHODE COMPLEXE GLOBALE. LE PROGRAMME DE RESOLUTION DE PROBLEME AUX VALEURS PRORES GENERALISEES, PAR LA METHODE DES ITERATIONS DES SOUS ESPACES, DEVELOPPE AU CHAPITRE IV, PERMET DE CONFIRMER LES RESULTATS OBTENUS.
Author: Quang Anh Phan
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Au cours des dernières décennies, la modélisation numérique des dispositifs électromagnétiques en présence de courants de Foucault a été l'objet d'un nombre important de développements reposant sur différentes formulations et méthodes numériques.La méthode des éléments de frontière ou méthode intégrale de frontière est une méthode numérique très compétitive puisque, par opposition aux approches volumiques, elle ne nécessite que la discrétisation de la frontière du domaine. Elle est toutefois limitée aux matériaux isotropes, homogènes et linéaires, ce qui est une limitation importante. Elle peut tout de même s'avérer être attractive pour certaines applications où une telle hypothèse peut être formulée.Dans le cadre de cette thèse, nous allons nous concentrer sur la modélisation du problème courants de Foucault par la méthode des équations intégrales de frontière soumis à des excitations harmoniques. Ce rapport propose une synthèse sur ces formulations notamment avec une comparaison fine des formulations présentes dans la littérature. Plusieurs nouvelles formulations sont ensuite proposées et développées, dans l'objectif de comparer la méthode des équations intégrales de frontière à d'autres méthodes numériques (méthode couplée éléments finis / équations intégrales de frontières, méthode intégrale de volume avec une condition impédance de surface).
Author: Gérard Meunier
Publisher: John Wiley & Sons
ISBN: 0470393807
Category : Science
Languages : en
Pages : 618
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Book Description
Written by specialists of modeling in electromagnetism, this book provides a comprehensive review of the finite element method for low frequency applications. Fundamentals of the method as well as new advances in the field are described in detail. Chapters 1 to 4 present general 2D and 3D static and dynamic formulations by the use of scalar and vector unknowns and adapted interpolations for the fields (nodal, edge, face or volume). Chapter 5 is dedicated to the presentation of different macroscopic behavior laws of materials and their implementation in a finite element context: anisotropy and hysteretic properties for magnetic sheets, iron losses, non-linear permanent magnets and superconductors. More specific formulations are then proposed: the modeling of thin regions when finite elements become misfit (Chapter 6), infinite domains by using geometrical transformations (Chapter 7), the coupling of 2D and 3D formulations with circuit equations (Chapter 8), taking into account the movement, particularly in the presence of Eddy currents (Chapter 9) and an original approach for the treatment of geometrical symmetries when the sources are not symmetric (Chapter 10). Chapters 11 to 13 are devoted to coupled problems: magneto-thermal coupling for induction heating, magneto-mechanical coupling by introducing the notion of strong and weak coupling and magneto-hydrodynamical coupling focusing on electromagnetic instabilities in fluid conductors. Chapter 14 presents different meshing methods in the context of electromagnetism (presence of air) and introduces self-adaptive mesh refinement procedures. Optimization techniques are then covered in Chapter 15, with the adaptation of deterministic and probabilistic methods to the numerical finite element environment. Chapter 16 presents a variational approach of electromagnetism, showing how Maxwell equations are derived from thermodynamic principles.
Author: Chanthalangsy, Phinith
Publisher: UNESCO Publishing
ISBN: 9231010069
Category : Philosophy
Languages : en
Pages : 236
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Book Description
Author: Miroslav Chomat
Publisher: BoD – Books on Demand
ISBN: 9533075481
Category : Technology & Engineering
Languages : en
Pages : 278
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Book Description
The subject of this book is an important and diverse field of electric machines and drives. The twelve chapters of the book written by renowned authors, both academics and practitioners, cover a large part of the field of electric machines and drives. Various types of electric machines, including three-phase and single-phase induction machines or doubly fed machines, are addressed. Most of the chapters focus on modern control methods of induction-machine drives, such as vector and direct torque control. Among others, the book addresses sensorless control techniques, modulation strategies, parameter identification, artificial intelligence, operation under harsh or failure conditions, and modelling of electric or magnetic quantities in electric machines. Several chapters give an insight into the problem of minimizing losses in electric machines and increasing the overall energy efficiency of electric drives.
Author: Claire Clivaz
Publisher:
ISBN: 9789004399655
Category : Bible
Languages : en
Pages : 0
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Book Description
Ecritures digitales aims to demonstrate how digital writing, as new technology, contributes to the emergence of a reconfigured relationship between the human body and the machines, and how this transition influences the Jewish-Christian textual corpus referred to as "the Scriptures". Ecritures digitales souhaite démontrer de quelle manière l'écriture digitale, en tant que nouvelle technologie, contribue à l'émergence d'une relation innovante entre le corps humain et les machines, et influence le corpus textuel judéo-chrétien désigné comme «les Ecritures».
Author: Carolyn Côté-Lussier
Publisher: University of Ottawa Press
ISBN: 0776628720
Category : Social Science
Languages : en
Pages : 396
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Book Description
Contemporary Criminological Issues tackles some of today’s most pressing social issues, from the criminalization of Indigenous peoples to interpersonal violence, border control, and armed conflicts. This book advances cutting-edge theories and methods, with the aim of moving beyond the scholarship that reproduces insecurity and exclusion. The breadth of approaches encompasses much of the current critical criminological scholarship, serving as a counterpoint to the growth of managerial and administrative criminologies and the rise of explicitly exclusionary and punitive state policies and practices with respect to ‘crime’ and ‘security.’ This edited collection featuring two books, one in English and one in French, includes important contributions to knowledge and public policy by eminent experts and emerging scholars. This book is published in English.
Author: International Atomic Energy Agency
Publisher: International Atomic Energy Agency
ISBN: 9789201063205
Category : Technology & Engineering
Languages : en
Pages : 72
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Book Description
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.
Author: Xavier Perpinya
Publisher: BoD – Books on Demand
ISBN: 9535104489
Category : Technology & Engineering
Languages : en
Pages : 537
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Book Description
Railway transportation has become one of the main technological advances of our society. Since the first railway used to carry coal from a mine in Shropshire (England, 1600), a lot of efforts have been made to improve this transportation concept. One of its milestones was the invention and development of the steam locomotive, but commercial rail travels became practical two hundred years later. From these first attempts, railway infrastructures, signalling and security have evolved and become more complex than those performed in its earlier stages. This book will provide readers a comprehensive technical guide, covering these topics and presenting a brief overview of selected railway systems in the world. The objective of the book is to serve as a valuable reference for students, educators, scientists, faculty members, researchers, and engineers.
Author: Martin Lindstrom
Publisher: Currency
ISBN: 0385523890
Category : Business & Economics
Languages : en
Pages : 274
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Book Description
NEW YORK TIMES BESTSELLER • “A fascinating look at how consumers perceive logos, ads, commercials, brands, and products.”—Time How much do we know about why we buy? What truly influences our decisions in today’s message-cluttered world? In Buyology, Martin Lindstrom presents the astonishing findings from his groundbreaking three-year, seven-million-dollar neuromarketing study—a cutting-edge experiment that peered inside the brains of 2,000 volunteers from all around the world as they encountered various ads, logos, commercials, brands, and products. His startling results shatter much of what we have long believed about what captures our interest—and drives us to buy. Among the questions he explores: • Does sex actually sell? • Does subliminal advertising still surround us? • Can “cool” brands trigger our mating instincts? • Can our other senses—smell, touch, and sound—be aroused when we see a product? Buyology is a fascinating and shocking journey into the mind of today's consumer that will captivate anyone who's been seduced—or turned off—by marketers' relentless attempts to win our loyalty, our money, and our minds.
