Download or read book Turbulence d ondes dans les plaques minces en vibration written by Thomas Humbert and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence d'ondes dans les plaques minces en vibration : étude expérimentale et numérique de l'effet de l'amortissement La théorie de turbulence d'ondes a pour but de décrire le comportement à long terme de systèmes faiblement non linéaires hors équilibre. Pour les plaques minces en vibration, ce formalisme permet de prédire un spectre de Kolmogorov-Zakharov (KZ) avec un flux d'énergie transféré des échelles d'injection à celles de dissipation le long d'une fenêtre de transparence. Les études expérimentales antérieures à cette thèse ont mis en lumière des différences notables entre les spectres mesurés et les specres théoriques. La présence, dans un solide, de l'amortissement à toutes les échelles, est ici étudié afin d'expliquer ce désaccord. En contrôlant expérimentalement l'amortissement, il a été montré que la dissipation déterminait la forme des spectres. Par la caractérisation de l'amortissement, il a été trouvé que ce dernier peut être décrit en fonction de la fréquence par une loi de puissance. La dissipation expérimentale a alors pu être introduite directement dans une simulation numérique des équations de Föppl-von Kàrmàn. Cette démarche conduit à passer de la solution théorique KZ obtenue en l'absence de dissipation à des spectres très proches des spectres expérimentaux. Ces observations ne remettent pas en cause l'emploi de la turbulence d'ondes pour décrire la vibration d'une plaque mince sollicitée par un forçage d'une grande amplitude mais encouragent à étendre les outils théoriques à notre disposition en l'absence d'une fenêtre de transparence. En réalisant cette généralisation de façon phénoménologique, une nouvelle solution stationnaire, différente de KZ et valable pour toute loi d'amortissement, a pu être calculée numériquement.
Download or read book Etudes exp rimentales et num riques de la turbulence d ondes de flexion written by Benjamin Miquel and published by . This book was released on 2013 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les spectres expérimentaux des ondes de flexion dans les plaques élastiques minces diffèrent du spectre de Zakharov, prédit par la théorie de la turbulence d'ondes. La validité et le rôle des deux hypothèses de la turbulence d'ondes -- la séparation d'échelles temporelles et l'existence d'une fenêtre de transparence -- ont été étudiées. La caractérisation de l'amortissement des ondes dans notre système a révélé l'absence d'une fenêtre de transparence. Incorporé à une simulation numérique des équations dynamiques d'une plaque mince, cet amortissement permet de reproduire les spectres expérimentaux, plus raides que le spectre de Zakharov, validant ainsi la pertinence de la description de l'expérience à l'aide de ces équations. La solution de Zakharov est cependant retrouvée lorsque nous annulons la dissipation aux échelles intermédiaires. L'existence d'une fenêtre de transparence apparaît donc comme une condition nécessaire à l'observation des prédictions de la turbulence d'ondes. Enfin, l'hypothèse de la séparation d'échelle temporelle a été validée par une mesure du temps non linéaire associé aux échanges d'énergie entre ondes, utilisant une analyse en paquets d'ondes du mouvement. Cependant, pour les très forts forçages expérimentaux, ce temps non linéaire devient de l'ordre de la période des ondes aux grandes échelles, pour lesquelles le spectre change de forme. Ces observations ont été prolongées grâce aux simulations numériques, qui ont permis d'observer l'apparition d'un régime fortement non linéaire dans lequel prédominent aux grandes échelles les d-cones et les plis.
Download or read book Optimization Optimal Control and Partial Differential Equations written by Viorel Barbu and published by Springer Science & Business Media. This book was released on 1992 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Variational methods in mechanics and physical models.- Fluid flows in dielectric porous media.- The impact of a jet with two fluids on a porous wall.- Critical point methods in nonlinear eigenvalue problems with discontinuities.- Maximum principles for elliptic systems.- Exponential dichotomy of evolution operators in Banach spaces.- Asymptotic properties of solutions to evolution equations.- On some nonlinear elastic waves biperiodical or almost periodical in mechanics and extensions hyperbolic nonlinear partial differential equations.- The controllability of infinite dimensional and distributed parameter systems.- Singularities in boundary value problems and exact controllability of hyperbolic systems.- Exact controllability of a shallow shell model.- Inverse problem: Identification of a melting front in the 2D case.- Micro-local approach to the control for the plates equation.- Bounded solutions for controlled hyperbolic systems.- Controllability and turbulence.- The H? control problem.- The H? boundary control with state feedback; the hyperbolic case.- Remarks on the theory of robust control.- The dynamic programming method.- Optimality and characteristics of Hamilton-Jacobi-Bellman equations.- Verification theorems of dynamic programming type in optimal control.- Isaacs' equations for value-functions of differential games.- Optimal control for robot manipulators.- Control theory and environmental problems: Slow fast models for management of renewable ressources.- On the Riccati equations of stochastic control.- Optimal control of nonlinear partial differential equations.- A boundary Pontryagin's principle for the optimal control of state-constrained elliptic systems.- Controllability properties for elliptic systems, the fictitious domain method and optimal shape design problems.- Optimal control for elliptic equation and applications.- Inverse problems for variational inequalities.- The variation of the drag with respect to the domain in Navier-Stokes flow, .- Mathematical programming and nonsmooth optimization.- Scalar minimax properties in vectorial optimization.- Least-norm regularization for weak two-level optimization problems.- Continuity of the value function with respect to the set of constraints.- On integral inequalities involving logconcave functions.- Numerical solution of free boundary problems in solids mechanics.- Authors' index
Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Download or read book Dynamics of Spatio Temporal Cellular Structures written by Innocent Mutabazi and published by Springer Science & Business Media. This book was released on 2005-12-15 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact of Benard's discovery on 20th century physics is crucial to any modern research area such as fluid dynamics, nonlinear dynamics, and non-equilibrium thermodynamics, just to name a few. This centenary review shows the broad scope and development including modern applications, edited and written by experts in the field.
Download or read book Sound Flow Interactions written by Y. Auregan and published by Springer. This book was released on 2007-06-18 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: The coupling between acoustic waves and fluid flow motion is basically nonlinear, with the result that flow and sound modify themselves reciprocally with respect to generation and propagation properties. As a result this problem is investigated by many different communities, such as applied mathematics, acoustics and fluid mechanics. This book is the result of an international school which was held to discuss the foundation of sound--flow interactions, to share expertise and methodologies, and to promote cross-fertilization between the different disciplines involved. It consists essentially of a set of pedagogical lectures and is meant to serve not only as a compact source of reference for the experienced researcher but also as an advanced textbook for postgraduate students, and nonspecialists wishing to familiarize themselves in depth, at a research level, with this fascinating subject.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Body Electric written by Robert Becker and published by Harper Collins. This book was released on 1998-07-22 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Body Electric tells the fascinating story of our bioelectric selves. Robert O. Becker, a pioneer in the filed of regeneration and its relationship to electrical currents in living things, challenges the established mechanistic understanding of the body. He found clues to the healing process in the long-discarded theory that electricity is vital to life. But as exciting as Becker's discoveries are, pointing to the day when human limbs, spinal cords, and organs may be regenerated after they have been damaged, equally fascinating is the story of Becker's struggle to do such original work. The Body Electric explores new pathways in our understanding of evolution, acupuncture, psychic phenomena, and healing.
Download or read book AGARD Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1978 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Poetics of Novels written by M. Axelrod and published by Springer. This book was released on 1999-09-17 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Poetics of Novels deals with the fundamentals of novel-writing and the execution of such, and though it engages specific notions of literary and cultural theory, it privileges the architectonics of the texts themselves as it crosses boundaries of both time and culture. Novels include: Austen's Northanger Abbey , Beckett's Company , Brontë's Wuthering Heights , Cervantes' Don Quixote , Flaubert's Madame Bovary , Hamsun's Hunger , Hardy's Tess of the D'Urbervilles , Lispector's Hour of the Star and Smart's By Grand Central Station I Sat Down and Wept .
Download or read book Dictionary of Civil Engineering written by Jean-Paul Kurtz and published by Springer Science & Business Media. This book was released on 2004-09-14 with total page 1520 pages. Available in PDF, EPUB and Kindle. Book excerpt: I am pleased to present a work which marks a milestone in the history of public works and, more precisely, in that of permanent structures—a comprehensive dictionary of Civil Engineering terms. Since the beginning of time, Man has always tried to find a means to clear the obstacles which nature erected to displace him. With the first tree trunk thrown across a river, man sought to improve the crossing structure. After the invention of the wheel, and to satisfy his thirst for conquest (Roman ways), and comfort (aqueducts), man built bridges that became a preremptory necessity to move quickly. Thus, Man started to build wooden and masonry works. With the passing centuries, the builders became masters in the art of building masonry works. Then came the Industrial Revolution and the advent of the steel (1864), which was closely followed by the invention of the reinforced concrete (1855). The need for railways and improving the road network inspired great works of crossing such as viaducts and tunnels. The boom of the railway network and the development of the car required the construction of an increasing number of new structures. This phenomenon continues today with hundreds of structures built each year throughout the world.
Download or read book Advances in Hydroinformatics written by Philippe Gourbesville and published by Springer. This book was released on 2015-08-21 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of extended papers based on presentations given during the SIMHYDRO 2014 conference, held in Sophia Antipolis in June 2014. It focuses on the modeling and simulation of fast hydraulic transients, on 3D modeling, and on uncertainties and multiphase flows. The book explores both the limitations and performance of current models and presents the latest developments based on new numerical schemes, high-performance computing, multiphysics and multiscale methods, and better interaction with field or scale model data. It addresses the interests of practitioners, stakeholders, researchers and engineers active in this field.
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.
Download or read book Singularities in Boundary Value Problems written by Pierre Grisvard and published by Springer. This book was released on 1992 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book I Will Survive written by Gloria Gaynor and published by Macmillan + ORM. This book was released on 2014-03-11 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: I Will Survive is the story of Gloria Gaynor, America's "Queen of Disco." It is the story of riches and fame, despair, and finally salvation. Her meteoric rise to stardom in the mid-1970s was nothing short of phenomenal, and hits poured forth that pushed her to the top of the charts, including "Honey Bee," "I Got You Under My Skin," "Never Can Say Goodbye," and the song that has immortalized her, "I Will Survive," which became a #1 international gold seller. With that song, Gloria heralded the international rise of disco that became synonymous with a way of life in the fast lane - the sweaty bodies at Studio 54, the lines of cocaine, the indescribable feeling that you could always be at the top of your game and never come down. But down she came after her early stardom, and problems followed in the wake, including the death of her mother, whose love had anchored the young singer, as well as constant battles with weight, drugs, and alcohol. While her fans always imagined her to be rich, her personal finances collapsed due to poor management; and while many envied her, she felt completely empty inside. In the early 1980s, sustained by her marriage to music publisher Linwood Simon, Gloria took three years off and reflected upon her life. She visited churches and revisited her mother's old Bible. Discovering the world of gospel, she made a commitment to Christ that sustains her to this day.
Download or read book A Source Book in Physics written by William Francis Magie and published by . This book was released on 1935 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
