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Etude Numerique Et Experimentale Du Comportement Dun Film Lubrifiant Soumis A Un Chargement Periodique
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Book Synopsis Etude numérique et expérimentale du comportement d'un film lubrifiant soumis à un chargement périodique by : Khalid Zarbane
Download or read book Etude numérique et expérimentale du comportement d'un film lubrifiant soumis à un chargement périodique written by Khalid Zarbane and published by . This book was released on 2009 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le chargement dynamique des paliers hydrodynamiques et des amortisseurs à film fluide soumet le film lubrifiant à une action d'écrasement périodique. Cette sollicitation conditionne la portance du film lubrifiant et peut engendrer sa rupture, créant ainsi des conditions sévères de fonctionnement. L'étude approfondie, tant expérimentale que numérique du comportement du film soumis à une action d'écrasement périodique, s'avère donc indispensable pour pouvoir maîtriser les performances de ces dispositifs. Pour ce faire, trois codes de calcul numérique sont développés dans le cadre de cette thèse. Ces codes sont basés sur la théorie de JFO. Les équations établies sont discrétisées en différences finies et en éléments finis. Pour un film d’huile écrasé périodiquement, à faibles fréquences, entre deux surfaces conformes, les prédictions numériques de ces trois codes sont très proches. Par ailleurs, les visualisations numériques de la rupture dans les différents types de contacts ont montré l'impact de la fréquence des oscillations sur l'étendue et la durée de la rupture de film. L'étude expérimentale est conduite via un banc d’essai conçu puis réalisé. Deux modes de rupture de film sont identifiés : la rupture par séparation des gaz saturés et la rupture par séparation due à l'introduction de l’air ambiant. La visualisation de chaque mode est conditionnée par la fréquence des oscillations. La forme de la zone de rupture due à l'introduction de l'air ambiant dépend de la fréquence, de la hauteur du bain d'huile et de la géométrie du contact. Pour les surfaces non conformes, les résultats des modèles numériques sont en bon accord avec les résultats expérimentaux. Les différences constatées dans le cas des surfaces conformes sont dues aux imperfections géométriques et à la souplesse des structures qui composent le dispositif expérimental.
Book Synopsis Etude numérique et expérimentale des conditions de lubrification des roulements de boîte de vitesses by : Eric Tinguy
Download or read book Etude numérique et expérimentale des conditions de lubrification des roulements de boîte de vitesses written by Eric Tinguy and published by . This book was released on 2005 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: La durée de vie d'une boîte de vitesses est liée en partie au fonctionnement des paliers. La lubrification des roulements permet de maintenir l'équilibre thermique et de séparer les interfaces en contact. Cette étude repose sur la modélisation théorique et expérimentale du fonctionnement d'un roulement conique. Elle apporte une compréhension prédictive du comportement mécanique d'une part, avec le calcul de la raideur du roulement, et énergétique d'autre part, en réalisant le bilan des puissances dissipées au sein d'un roulement pour des sollicitations rencontrées dans les boîtes de vitesses. Le modèle de calcul prend en compte l'influence de la raideur du logement et de la correction de profil des génératrices des bagues et des rouleaux pour l'obtention de la raideur axiale. L'analyse quasi-statique prend en compte le comportement rhéologique visco - non linéaire du lubrifiant pour le calcul des forces et des moments de frottement agissant sur les surfaces des corps roulants et de la cage. Cette modélisation fournit le taux de glissement de la cage et la cinématique réelle des rouleaux, i.e. une vitesse angulaire propre qui diffère selon le corps roulant considéré. Une bonne corrélation est obtenue avec les résultats expérimentaux, pour le couple résistant du roulement. Ce travail constitue une première étape pour prédire la quantité de lubrifiant optimale à apporter au palier.
Book Synopsis Contribution expérimentale à l'étude de la rupture d'un film lubrifiant en régime de lubrification limite by : Bernard Lamy
Download or read book Contribution expérimentale à l'étude de la rupture d'un film lubrifiant en régime de lubrification limite written by Bernard Lamy and published by . This book was released on 1975 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis CALCULS DES CONTACTS LUBRIFIES A L'AIDE D'UN FLUIDE NON-NEXTONIEN. METHODES NUMERIQUES NOUVELLES by : BRAHIM.. NAJJI
Download or read book CALCULS DES CONTACTS LUBRIFIES A L'AIDE D'UN FLUIDE NON-NEXTONIEN. METHODES NUMERIQUES NOUVELLES written by BRAHIM.. NAJJI and published by . This book was released on 1985 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: CALCUL DU FROTTEMENT DANS UN CONTACT LUBRIFIE BIDIMENSIONNEL. GENERALISATION AUX CONTACTS LUBRIFIES TRIDIMENSIONNELS. SOLUTIONS EXISTANTES POUR LE CALCUL DU FROTTEMENT DANS UN CONTACT ELASTOHYDRODYNAMIQUE. UTILISATION DE LA METHODE DES ELEMENTS FINIS
Book Synopsis Étude numérique et expérimentale du mécanisme de lubrification eX-Poro-HydroDynamique (XPHD) by : Serguei Kunik
Download or read book Étude numérique et expérimentale du mécanisme de lubrification eX-Poro-HydroDynamique (XPHD) written by Serguei Kunik and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La lubrification eX-Poro-HydroDynamique (XPHD) est un mécanisme de lubrification d'inspiration biomimétique. Il s'agit principalement d'un écoulement dans un milieu poreux, dont la phase solide représentée par des fibres, induit des forces élastiques de compression considérées comme négligeables par rapport aux forces hydrodynamiques générées à l'intérieur du milieu poreux. L'idée essentielle de la lubrification XPHD consiste en remplacement du matériau antifriction et du film de fluide mince, traditionnellement utilisé dans les solutions classiques, par une couche poreuse imbibée d'un fluide qui fournit plus grande capacité de charge. Ce type de lubrification représente une solution technologique totalement nouvelle (en rupture avec la solution classique) qui peut permettre de remplacer les lubrifiants pétroliers, de créer des systèmes tribologiques autolubrifiants et donc plus écologiques et moins coûteux. Ce travail de recherche est donc focalisé sur l'évolution des performances de la lubrification XPHD dans le cadre d'un mouvement tangentiel, adapté à l'étude de butées pour faible et moyenne vitesses de rotation. Dans ce contexte scientifique, une étude approfondie d'un matériau poreux présélectionné (mousse en polyuréthane) fut réalisée avec le but de déterminer les caractéristiques physiques et les paramètres cruciaux pour la lubrification XPHD: la porosité et la perméabilité du matériau poreux. Les modèles théorique et numérique de lubrification XPHD proposés se basent sur l'équation de Darcy-Brinkman et les hypothèses de la lubrification classique, ainsi que l'écoulement à l'intérieur du milieu poreux sont prédit avec une nouvelle forme de l'équation de Reynolds. Le banc d'essais spécialement développé permet d'étudier expérimentalement le mécanisme de lubrification XPHD pour des différents types de dislocateur en combinaison avec des liquides newtoniens et nonnewtoniens. Une description détaillée du banc d'essais et de tous les dispositifs expérimentaux utilisés ainsi que la comparaison des résultats de modélisation et des résultats expérimentaux sont présentés.
Book Synopsis Basic Concepts for Simple and Complex Liquids by : Jean-Louis Barrat
Download or read book Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.
Book Synopsis On the Continuity of the Gaseous and Liquid States by : J. D. Van Der Waals
Download or read book On the Continuity of the Gaseous and Liquid States written by J. D. Van Der Waals and published by Courier Corporation. This book was released on 2004-01-01 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This much-cited thesis by J. D. van der Waals, the recipient of the 1910 Nobel Prize in physics, is accompanied by an introductory essay by J. S. Rowlinson and another work by van der Waals on the theory of liquid mixtures. 1988 edition.
Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Book Synopsis Nonlinear Optical Materials by : Jerome V. Moloney
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Book Synopsis The Decline of Transit by : Glenn Yago
Download or read book The Decline of Transit written by Glenn Yago and published by Cambridge University Press. This book was released on 1984-04-27 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: An examination of the social, political and technological forces that shaped our cities and their transportation systems.
Download or read book Car Mania written by Winfried Wolf and published by Pluto Press. This book was released on 1996 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study, covering 200 years, takes a look at transport past and present. It examines current European and American transport structures and policies in the light of sustainability and the environment and the social and economic consequences of the prese
Book Synopsis Shanghai Refuge by : Ernest G. Heppner
Download or read book Shanghai Refuge written by Ernest G. Heppner and published by U of Nebraska Press. This book was released on 1993-01-01 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unlikely refuge of Shanghai, the only city in the world that did not require a visa, was buffeted by the struggle between European imperialism, Japanese aggression, and Chinese nationalism. Ernest G. Heppner's compelling testimony is a brilliant account of this little-known haven. Although Heppner was a member of a privileged middle-class Jewish family, he suffered from the constant anti-Semitic undercurrent in his surroundings. The devastation of "Crystal Night" in November 1938, however, introduced a new level of Nazi horror and ended his comfortable world overnight. Heppner and his mother used the family's resources to escape to Shanghai. Heppner was taken aback by experiences on the ocean liner that transported the refugees to Shanghai: he was embarrassed and confounded when Egyptian Jews offered worn clothing to the Jewish passengers, he resented the edicts against Jewish passengers disembarking in any ports on the way, and he was unprepared for the poverty and cultural dislocation of the great city of Shanghai. Nevertheless, Heppner was self-reliant, energetic, and clever, and his story of finding niches for his skills that enabled him to survive in a precarious fashion is a tribute to human endurance. In 1945, after the liberation of China, Heppner found a responsible position with the American forces there. He and his wife, whom he had met and married in the ghetto, arrived in the United States in 1947 with only eleven dollars but boundless hope and energy. Heppner's account of the Shanghai ghetto is as vivid to him now as it was then. His admiration for his new country and his later success in business do not, however, obscure for him the shameful failure of the Allies to furnish a refuge for Jews before, during, and after the war.
Book Synopsis Secondary Flows in Turbomachines by : Von Karman Institute for Fluid Dynamics
Download or read book Secondary Flows in Turbomachines written by Von Karman Institute for Fluid Dynamics and published by . This book was released on 1975 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Jean Pierre Bardou Publisher :Chapel Hill, N.C. : University of North Carolina Press ISBN 13 : Total Pages :360 pages Book Rating :4.3/5 (555 download)
Book Synopsis The Automobile Revolution by : Jean Pierre Bardou
Download or read book The Automobile Revolution written by Jean Pierre Bardou and published by Chapel Hill, N.C. : University of North Carolina Press. This book was released on 1982 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Deindustrialization by : Mr.Ramana Ramaswamy
Download or read book Deindustrialization written by Mr.Ramana Ramaswamy and published by International Monetary Fund. This book was released on 1997-04-01 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: All advanced economies have experienced a secular decline in the share of manufacturing employment—a phenomenon referred to as deindustrialization. This paper argues that, contrary to popular perceptions, deindustrialization is not a negative phenomenon, but is the natural consequence of the industrial dynamism in an already developed economy, and that North-South trade has had very little to do with deindustrialization. The paper also discusses the implications of deindustrialization for the growth prospects and the nature of labor market arrangements in the advanced economies.
Book Synopsis Collins Atlas of 20th Century History by : Richard Overy
Download or read book Collins Atlas of 20th Century History written by Richard Overy and published by Collins Reference. This book was released on 2006-08-15 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: A single-volume reference to answer all your questions about history's most complex century. The 20th century was a time of massive political upheaval and rapid transition that included the Age of Imperialism, Lenin, the First World War, the rise of Hitler, the Second World War, decolonization, the founding of the United Nations, the collapse of Communism, and the Gulf Wars. The Collins Atlas of 20th Century History provides a new approach to understanding the century's major developments, from the height of the Imperial Age to the challenges of the post-Cold War era. Here is a visual presentation of an incredibly eventful 100 years, a tour through ten decades of conflict, hope, and innovation. Maps and graphics trace the rise and fall of empires and dictatorships, the hope for democracy, and the social and political change around the world. More than 200 full-color maps, diagrams, and timelines Edited by 20th century historian Richard Overy Comprehensive coverage of all areas of the world Examination of key battles and events Internet links for further research For anyone with an interest in the history, society, politics, warfare, and culture of the world, the Collins Atlas of 20th Century History is a perfect companion.
Book Synopsis Blood, Iron, and Gold by : Christian Wolmar
Download or read book Blood, Iron, and Gold written by Christian Wolmar and published by PublicAffairs. This book was released on 2010-03-02 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: The opening of the world's first railroad in Britain and America in 1830 marked the dawn of a new age. Within the course of a decade, tracks were being laid as far afield as Australia and Cuba, and by the outbreak of World War I, the United States alone boasted over a quarter of a million miles. With unrelenting determination, architectural innovation, and under gruesome labor conditions, a global railroad network was built that forever changed the way people lived. From Panama to Punjab, from Tasmania to Turin, Christian Wolmar shows how cultures were enriched, and destroyed, by one of the greatest global transport revolutions of our time, and celebrates the visionaries and laborers responsible for its creation.
