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Keynote Speakers (partial list)

Prof. Marco Amabili

Canada Research Chair, Department of Mechanical Engineering,
McGill University, Montreal, Canada

http://people.mcgill.ca/marco.amabili/

Title: Nonlinear Vibrations of Shells and Plates in Traditional, Soft and Advanced Materials

Abstract: The seminar will cover nonlinear vibrations and shell theories to model traditional and advanced materials, and soft tissues. While thin shells can be modeled with classical shell theories, structures in laminated and sandwich composite materials usually requires shell theories with shear deformation and rotary inertia. Biological soft tissues are usually subjected to significant static and dynamic loadings, potentially yielding large deflections and deformations that requires the introduction of hyperelastic models. For soft tissues the thickness deformation may also be very significant, and this requires the introduction of advanced shell theories that retain thickness deformation.

Static deflection as well as free and forced nonlinear vibrations of thin plates made of hyperelastic soft biological (or rubber) materials will be discussed. The material nonlinearities are described through Neo-Hookean, Mooney-Rivlin, and Ogden hyperelastic laws. Dynamic local models are first built in the vicinity of a static configuration of interest that has been previously calculated. Numerical results are compared and validated in the static case via a commercial FE software package: they are found to be accurate for deflections reaching 100 times the thickness of the plate. The natural frequency shift during large-amplitude vibrations weakens with an increased initial deflection. An advanced nonlinear plate and shell theory is also presented in the seminar. The effect of retaining nonlinearities in rotations and thickness deformation will be discussed.

About the Speaker
Marco Amabili is a Full Professor and holds the prestigious Canada Research Chair (Tier 1) on Vibrations and Fluid-Structure Interaction at McGill University, Montreal, Canada. He is the author of the well-received book “Nonlinear vibrations and stability of shells and plates” published by Cambridge University Press in 2008. Professor Amabili is distinctly known for his research on nonlinear vibrations of shells and plates and fluid-structure interaction.

He serves as Contributing Editor of International Journal of Non-linear Mechanics (Elsevier), Associate Editor of Journal of Fluids and Structures, ASME Journal of Vibration and Acoustics, Mechanics Based Design of Structures and Machines and is member of the Editorial Board of Journal of Sound and Vibration and International Journal of Structural Stability and Dynamics. He also served as Associate Editor of the ASME Applied Mechanics Reviews and as guest editor of a special issue of Computers and Structures. He is the author of 162 Journal papers and over 160 conference papers. Professor Amabili received about 2600 citations and has H-Index 28, quickly growing. Marco Amabili has given many invited lectures in several countries, including USA, Canada, Italy, Ukraine, France, Poland, Greece, Switzerland and Iran. He organized many symposia, he has been the chair of the 4th Canadian Conference on Nonlinear Solid Mechanics (2013), co-chair of the Euromech Colloquium 483 “Geometrically non-linear vibrations of structures” and served in the Scientific Committee of many conferences worldwide.

 

Dr. Bernard Brogliato

INRIA Grenoble-Rhone-Alpes, Bipop team-project, 655 avenue de l'Europe, 38334 Saint-Ismier, France

http://www.inrialpes.fr/bipop/people/brogliato/

Title: Discrete-time sliding mode control: Do it implicitly!

Abstract: Sliding-mode control is a well-known robust feedback control method, which was invented more than sixty years ago, and has since then witnessed an impressive amount of research and applications. Of particular interest is the implementation of such discontinuous, multivalued controllers in discrete-time. The classical discretization of the set-valued input (the sign function) is done in an explicit way. This has been proved to yield numerical chattering (spurious oscillations due to the discretization), both in the output and the input signals. In particular the discontinuous input behaves like a very high frequency bang-bang controller, which is highly undesirable in practice. Recently a new type of discretization, named the implicit method, has been introduced. It is inspired from numerical schemes for the simulation of mechanical systems with friction and impacts. In this talk we will describe the basics of the implicit discrete-time sliding mode control, and then show with extensive experimental results obtained on an electro-pneumatic and a mechanical systems, that it allows to suppress the chattering in both the output (tracking control) and the input. Both the equivalent-control based, and the twisting algorithms are tested. The new discrete-time controllers are easily implemented with few lines of MatLab code.

 

Dr. Michael Z.Q. Chen

Department of Mechanical Engineering; Faculty of Engineering; University of Hong Kong, China

http://web.hku.hk/~mzqchen/

Title: Passive mechanical synthesis and applications with the inerter

Abstract: This talk will discuss some recent work on the synthesis of general passive mechanical impedances and its application to problems of mechanical control. The need for a new modelling element (the inerter) will be explained and its mechanical construction discussed. The recent deployment of the inerter in Formula One racing cars will be described. Recent results on restricted complexity synthesis and inerter's applications to suspension control and vibration systems will be presented.

 

Prof. Daniel J. Inman

Department of Aerospace Engineering
University of Michigan, Ann Arbor, Michigan USA

http://www.engin.umich.edu/college/about/people/profiles/f-to-j/daniel-inman

Title: Smart Structures and Metastructures in Vibration Problems

Abstract: The field of adaptive structures or smart structures has grown and expanded from the early days of smart materials to today’s research in multifunctional structures, adaptive composites and more recently metastructures. This talk touches on each of these topics but does so from the point of view of applications consisting of structural monitoring, energy harvesting for small electronics, vibration suppression and gust alleviation in unmanned air vehicles.

Smart materials consist of transducer materials such as shape memory alloys, piezoelectric materials and electroactive polymers. Most the applications presented here use the piezoelectric effect. Metastructure refers to the use of periodic inserts placed in a structure to give it enhanced abilities such as high damping.

 

Guang Meng

Vice President of Shanghai Academy of Spaceflight Technology
Professor in Shanghai Jiao Tong University

http://me.sjtu.edu.cn/sz_minglu/showDetail.aspx?cid=4&id=55

Title: Spacecraft Micro-Vibration and Control

Abstract: Spacecraft micro-vibration is mainly caused by operation of the inside moving parts and mechanical effect of the outside space environment and is usually presented as low-amplitude oscillation or reciprocating motion.The essence of spacecraft micro-vibration can be generalized as on-orbit vibration problem. The problem brought by micro-vibration has not received enough attention at the early stage due to the low precision and performance requirement of the micro-vibration insensitive payload. However, with the swift and violent development of the high-resolution satellites, deep space exploration and outer space experiment projects in recent years, the systematic research on micro-vibration is being developed rapidly in China to make the spacecraft meet the 'mg' environment requirement of the payload. A brief introduction about the characteristics of micro-vibration and it's effect on different kinds of payloads as well as the payloads requirements on the type and magnitude of the micro-vibration is presented first. A research summary is given then at the aspects of micro-vibration suppression technique and micro-vibration measurement and experiment technique. Combining the requirements of the current and the follow-up spacecraft model with the fundamental and engineering problem, the direction and suggestion for the development of the micro-vibration research are proposed at last to provide positive reference in micro-vibration research field.

 

Prof. K. W. Wang

Stephen P. Timoshenko Professor and Tim Manganello/BorgWarner Chair
Department of Mechanical Engineering
University of Michigan
Ann Arbor, MI, USA.

https://me-web2.engin.umich.edu/pub/directory/bio?uniqname=kwwang

Title: On the Tailoring of Adaptive Structures for Structural Dynamics Enhancement

Abstract: During the past couple of decades, due to the advances in materials, electronics, and system integration technologies, structural dynamics and controls researchers in various engineering disciplines have been investigating the feasibility of creating adaptive structures. The ultimate vision is to develop a multifunctional structural system that has various distributed and built-in autonomous abilities, such as vibration and stability controls, shape configuration and morphing, materials and mechanical property variations, energy harvesting, and health monitoring. From a structural system point of view, one of the major challenges is on how to best synthesize the cross-field and local-global coupling characteristics of the various adaptive materials and elements to optimize the overall structure performance. In recent years, interesting phenomena have been explored and promising results have been illustrated. It is recognized that to achieve significant new advances in adaptive structural systems, researchers have to conduct even more cross talks with various disciplines. This presentation will review and discuss some of the recent research efforts in adaptive structure dynamics enhancement via multi-field and localglobal tailoring.

About the Speaker
Kon-Well Wang is the Stephen P. Timoshenko Collegiate Professor and Tim Manganello/BorgWarner Department Chair of Mechanical Engineering at the University of Michigan. He received his Ph.D. degree from the University of California at Berkeley in 1985, worked at the General Motors Research Labs as a Senior Research Engineer, and started his academic career as a faculty at the Pennsylvania State University in 1988. During his Penn State years, Professor Wang has served as the William E. Diefenderfer Chaired Professor in Mechanical Engineering, Director of the Structural Dynamics and Controls Lab, Associate Director of the Vertical Lift Research Center of Excellence, and Group Leader for the Center for Acoustics and Vibration. Dr. Wang joined the University of Michigan in 2008. Professor Wang’s main technical interests are in adaptive structural systems and structural dynamics & controls. He has received various recognitions for his accomplishments; such as the SPIE Smart Structures and Materials Lifetime Achievement Award, the ASME Adaptive Structures and Materials Systems Prize, the ASME N.O. Myklestad Award, the ASME Adaptive Structures and Material Systems Best Paper Award, the ASME Rudolf Kalman Best Paper Award, the NASA Tech Brief Award, and the SAE Ralph Teetor Award. He is a Fellow of the ASME, AAAS, and IOP. Professor Wang has been the Chief Editor for the ASME Journal of Vibration and Acoustics. He is currently an Associate Editor for the Journal of Intelligent Material Systems and Structures and an Editorial Advisory Board Member for the Journal of Sound and Vibration.

 

Prof. Gabor Stepan

Department of Applied Mechanics
Budapest Unviersity of Technology and Economics

http://www.mm.bme.hu/~stepan/

Title: Delayed oscillators and shimmy: where the rubber meets the road

Abstract: We give a short introduction to the linear stability and basic bifurcation phenomena of delayed mechanical oscillators including the time-periodc ones leading to the delayed Mathieu equation paradigm. The engineering examples range from human control of mechanical systems, like balancing or car driving, to dynamic contact problems like wheel shimmy. We conclude to the common underlying dynamical effects of the time delays.

 

Prof. J.W. Zu

Department of Mechanical & Industrial Engineering
Department of Mechanical & Industrial Engineering, Faculty of Applied Science & Engineering, University of Toronto

http://www.mie.utoronto.ca/faculty/zu

Title: Nonlinear Vibration-based Piezoelectric Energy Harvesting

Abstract: Vibration-based piezoelectric energy harvesting opens up a promising avenue for power generation from ambient vibrations. The goal of piezoelectric energy harvesters is to replace batteries to supply power to small electronic devices. A conventional piezoelectric energy harvester uses a cantilever beam with piezoelectric layers attached. While simple and compact, conventional piezoelectric energy harvester can only scavenge vibrations effectively in a small range of frequency and in a single direction. Since ambient vibration sources vary in frequencies and directions,it is important to expand working bandwidth and multi-directionality of piezoelectric energy harvesters. This talk focuses on design and development of different nonlinear vibration-based piezoelectric energy harvesters. Geometric nonlinear configurations and magnet-induced structures are presented to improve functionality of piezoelectric energy harvesters. Theoretical and experimental results demonstrate that both geometric nonlinearities and magnetic force can effectively expand the bandwidth and harvest vibration energy multi-directionally.

 

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