IUTAM Symposium on Dynamics and Control of Nonlinear Systems with Uncertainty: Proceedings of the IUTAM Symposium held in Nanjing, China, September 18-22, 2006 (IUTAM Bookseries Book 2)

The concept of dynamics and control implies the combination of dynamic analysis and control synthesis. It is essential to gain an insight into the dynamics of a nonlinear system with uncertainty if any new control strategy is designed to utilize nonlinearity. However, the new control strategy to be proposed must be robust enough so that any unexpected small disturbances will not alter the desired target of control. Such a concept is calling more attention to the modelling and simplification of dynamic systems subject to uncertain environment, the fine analysis and robust design of controlled dynamic systems based on either good understanding of nonlinear phenomena or artificial intelligence, the combination of passive control, active control and semi-active control, as well as the interaction among sensors, controllers and actuators. The last decade has witnessed an increasing interest towards the dynamics and control of nonlinear engineering systems from the scientists engaged in nonlinear dynamics and the control engineers. Both groups of people have recognized the importance of interaction between nonlinear dynamics and robust control during their efforts to improve the dynamic performance of engineering systems with uncertainty, which comes from either the random excitations, such as wind and earthquake, or the modelling errors of real systems including their sensors, controllers and actuators. The dynamics and control of nonlinear systems with uncertainty, therefore, is a vital interdisciplinary topic related to both stochastic systems and deterministic systems. This volume contains the papers presented at the IUTAM Symposium on Dynamics and Control of Nonlinear Systems with Uncertainty, which was sponsored by the International Union of Theoretical and Applied Mechanics (IUTAM) and held at Nanjing University of Aeronautics and Astronautics, China, 18-22 September, 2006. The aim of the symposium was to bringing together the scientists to discuss the advances in dynamics and control of nonlinear systems, especially those with uncertainties in either system modeling or excitation. The scientific committee, appointed by the Bureau of IUTAM, includes the following members: F. L. Chernousko, Moscow, Russia E. Kreuzer, Hamburg, Germany (Co-Chairman) H. Y. Hu, Nanjing, China (Chairman) A. H. Nayfeh, Blacksburg, USA G. Rega, Rome, Italy W. Schiehlen, Stuttgart, Germany (IUTAM representative) K. Sobczyk, Warsaw, Poland G. Stepan, Budapest, Hungary H. Troger, Wien, Austria ix x Preface

the Investigation Of Multiscale Problems In Multibody System Contacts Is A Most Interesting And Timely Topic Which Has Been The Subject Of Intensive Research For More Than One Decade. While Many Questions Have Been Answered And The Mechanically Sound Description And Simulation Is Increasingly Applied In Practical Engineering Problems, This Iutam Symposium Facilitated Discussions Between Researchers Active In The Field And Enabled Us To Review The State-of-the-art And To Identify For The Years To Come The Hot Topics Which Require Further Efforts.

it Was Especially Useful To Bring Together Scientists From Closely Related But Traditionally Distinct Fields Such As Multibody System Contact, Molecular Dynamics, Finite Element Contact, Collision Detection Or The Mathematics Of Unilateral Contact. It Is Observed That The Once Clear Boundaries Between These Fields Are Blurring And An Exchange Of Ideas Will Accelerate The Development With Mutual Benefits.

multiscale Problems Occur Very Naturally In Contact Mechanics. Typically The Contact Forces And Stresses Are Very High And They Are Transmitted Within A Very Short Period Of Time. This Leads To Questions, E.g. How The Slow Rigid Body Motion And The Fast Motion Changes Can Be Considered Simultaneously Or How Interface Effects Couple To Wave Propagation And The Large-scale Motion.

the Purpose Of The Symposium Was Be To Provide A Basis For Discussion And Exchange Of New Concepts And Ideas To Scientists From All Over Europe And The World. This Proceedings Volume Summarizes Contributions Of Many Authors Active In The Field And Gives Insight In Very Different Areas Of This Fascinating Research.

The investigations of multiscale problems in multibody system contacts is a most interesting and timely topic which is the subject of intensive research for more than a decade. Many questions have already been answered and the mechanically sound description and simulation is increasingly being applied to practical engineering problems. The IUTAM Symposium on "Multiscale Problems in Multibody System Contacts" in Stuttgart, Germany which was held February 20-23, 2006 facilitated discussions between researchers active in the?eld and enabled us to review the current state of the subject, and to identify the important topics which require further e?ort. Multiscale problems occur very naturally in contact mechanics. Typically thecontactforcesandstressesareveryhighandthey aretransmittedwithina veryshortperiodoftime. This leadstoquestions, e.g.howtheslowrigidbody motion and the fast motion changes can be considered simultaneously or how interface e?ects couple with wave propagation and the large-scale motion. The purpose of the symposium was to provide a basis for discussion and exchange of new concepts and ideas between scientists from all over Europe and the world. Emphasis was placed also on sharing algorithms and concepts with young researchers who only recently entered the?eld of mechanical c- tacts The investigation of multiscale problems in multibody system contacts is an interesting and timely topic which has been the subject of intensive research. This proceedings volume summarizes contributions of many authors active in the field and gives insight in very different areas of this fascinating research. The concept of dynamics and control implies the combination of dynamic analysis and control synthesis. This book provides an insight into the dynamics of a nonlinear system with uncertainty and proposes a framework for a better control strategy