Contribution à l'étude des capteurs linéaires de déplacement à aimants PDF Download
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Author: Claire Blache
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
Le travail qui fait l'objet de ce mémoire, concerne l'étude des capteurs linéaires de déplacement à aimants, et plus particulièrement l'optimisation du circuit magnétique. Une classification des circuits magnétiques existants, basée sur leur géométrie met en évidence les axes de recherche de ces dernières années dans différents domaines d'application. De nouvelles structures magnétiques sont proposées et étudiées, soit par des méthodes de calcul analytique simplifiées, soit à l'aide du logiciel de calcul par éléments finis: flux 2d. Il s'agit de configurations classiques avec culasses de retour de flux et de configurations plus originales avec prismes magnétiques et aimantation tournante. L'effort peut se mesurer par l'intermédiaire des déformations et donc des déplacements qu'il provoque. Les déplacements sont de l'ordre du micron. Une des structures magnétiques, utilisable pour la réalisation de capteurs de micro-déplacement a été sélectionnée pour mesurer le déplacement lié à la déformation d'un roulement sous charge. Une maquette hors roulement a été réalisée.
Author: Claire Blache
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
Le travail qui fait l'objet de ce mémoire, concerne l'étude des capteurs linéaires de déplacement à aimants, et plus particulièrement l'optimisation du circuit magnétique. Une classification des circuits magnétiques existants, basée sur leur géométrie met en évidence les axes de recherche de ces dernières années dans différents domaines d'application. De nouvelles structures magnétiques sont proposées et étudiées, soit par des méthodes de calcul analytique simplifiées, soit à l'aide du logiciel de calcul par éléments finis: flux 2d. Il s'agit de configurations classiques avec culasses de retour de flux et de configurations plus originales avec prismes magnétiques et aimantation tournante. L'effort peut se mesurer par l'intermédiaire des déformations et donc des déplacements qu'il provoque. Les déplacements sont de l'ordre du micron. Une des structures magnétiques, utilisable pour la réalisation de capteurs de micro-déplacement a été sélectionnée pour mesurer le déplacement lié à la déformation d'un roulement sous charge. Une maquette hors roulement a été réalisée.
Author: Valérie Lemarquand
Publisher:
ISBN:
Category :
Languages : fr
Pages : 158
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Book Description
De nombreux capteurs de position angulaire qui utilisent les phénomènes d'induction ou les propriétés des aimants permanents existent déjà. Nous en proposons une classification en deux grandes familles: ceux qui ont un circuit magnétique fixe et ceux qui ont un circuit magnétique déformable. Chaque famille se subdivise selon le type de source de champ magnétique utilisé: aimant permanent ou bobine, bipolaire ou multipolaire. Tous les capteurs existants entrent dans les catégories ainsi crées mais laissent des catégories vides, qui sont remplies à l'aide de capteurs de conception originale. Certaines idées nouvelles ont été approfondies et leur étude a conduit à la construction de prototypes qui valident les principes. Ainsi, un prototype de capteur absolu illustre la famille «à circuit magnétique fixe et source bipolaire d'aimant». Un prototype capteur de couple est à circuit déformable et source bipolaire d'aimant: il mesure en fait un angle relatif. Un prototype de capteur absolu est à circuit déformable avec une bobine à la fois source et détecteur de champ: l'électronique mesure une phase. Ces trois prototypes ont permis de démontrer la nécessité de concevoir l'électronique de traitement et la géométrie l'une pour l'autre. Ils prouvent aussi qu'ils sont utilisables pour des applications industrielles
Author: Sven Boermeester
Publisher:
ISBN: 9781949677072
Category :
Languages : en
Pages :
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Book Description
Innovate Bristol highlights and celebrates those companies and individuals that are actively working at building a better tomorrow for all. Innovation Ecosystems thrive through the involvement and support of companies and individuals from all industries, which is why the Innovate series not only focuses on the innovators but also those people whom the Innovation Ecosystem, would not be able to thrive without.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: Don Montague
Publisher: Taylor & Francis
ISBN: 9780419199106
Category : Architecture
Languages : en
Pages : 472
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Book Description
This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Author: A. J. Trewavas
Publisher:
ISBN: 0199539545
Category : Intellect
Languages : en
Pages : 305
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Book Description
This book provides a convincing argument for the view that whole cells and whole plants growing in competitive wild conditions show aspects of plant behaviour that can be accurately described as 'intelligent'. Trewavas argues that behaviour, like intelligence, must be assessed within the constraints of the anatomical and physiological framework of the organism in question. The fact that plants do not have centralized nervous systems for example, does not exclude intelligent behaviour. Outside the human dimension, culture is thought largely absent and fitness is the biological property of value. Thus, solving environmental problems that threaten to reduce fitness is another way of viewing intelligent behaviour and has a similar meaning to adaptively variable behaviour. The capacity to solve these problems might be considered to vary in different organisms, but variation does not mean absence. By extending these ideas into a book that allows a critical and amplified discussion, the author hopes to raise an awareness of the concept of purposive behaviour in plants.
Author: Bruno Voituriez
Publisher: UNESCO
ISBN:
Category : Science
Languages : en
Pages : 132
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Book Description
El Nino, caprice of the heavens, scapegoat for every calamity? The general public cannot really understand what is behind the El Nino phenomenon. The book offers a tour of the Earth's climate to understand one of its normal but extreme components.
Author: Jacques Lafontaine
Publisher: Springer
ISBN: 3319207350
Category : Mathematics
Languages : en
Pages : 408
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Book Description
This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Author: P. M. Banks
Publisher: Elsevier
ISBN: 1483260666
Category : Science
Languages : en
Pages : 445
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Book Description
Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.
Author: Ira Helsloot
Publisher: Charles C Thomas Publisher
ISBN: 0398086834
Category : Business & Economics
Languages : en
Pages : 389
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Book Description
We live in turbulent times with continents and nations facing ever-heightening risks such as natural disasters, intense and protracted conflicts, terrorism, corporate crises, cyber threats to infrastructures and mega-events. We are witnessing the rise of mega-crises and a new class of adversity with many unknowns. The prospect of mega-crises presents professionals and students in the field of crisis management with four major tasks. First, they should engage in “deep thinking” about the causes of the increasing occurrence of mega-crises. Second, they should identify and work through the dominant trends which complicate contemporary crisis management. Third, they should upgrade institutional crisis management capacity. Fourth, they should improve societal resilience since no institutional complex can mitigate or manage these mega-crisis on its own. This book is divided into four primary parts, each of which looks at one facet of mega-crises. Part I focuses on the concept of a mega-crisis and mega-crisis management; Part II examines crisis management of mega-natural disasters; Part III evaluates crisis management of man-made mega-crises; and Part IV identifies mega-threats and vulnerabilities. Additional major topics include Hurricane Katrina; Hurricane Gustav; the London Bombings; the Mumbai Terrorist Attacks of July 7, 2005; corporate meltdowns; the subprime crisis; the Olympic Games; electricity grids; global climate change; the Dutch Delta; risks to food security; and mega-crises and the Internet. This comprehensive text will provide practitioners and academics with the results of an across-the-board research effort in the prospects, nature, characteristics, and the effects of mega-crises.
