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24th Conference on Mechanical Vibration and Noise (VIB) Steven W. Shaw University Distinguished Professor Department of Mechanical Engineering Michigan State University Keynote Speaker Coupled and Nonlinear MEMS Resonators for Sensing and Signal Processing Abstract The fabrication of mechanical structures with features at the micron scale is a mature technology. Sensors that utilize resonant mechanical elements at this scale have reached the marketplace, for example, in accelerometers and rate gyros, and the development of new applications continues. Most existing micro-electro-mechanical-system (MEMS) resonant devices rely on relatively simple linear response behavior, due to its predictability and robustness. However, these resonators can be designed to provide more subtle linear and nonlinear dynamics that offer advantages for some applications. These designs must account for effects not commonly encountered at the macro-scale, some of which, like electrostatic forces, offer design flexibility, while others, like thermal noise, typically degrade performance. In this presentation I will focus on the modeling, analysis, design, fabrication, and testing of MEMS resonators that make constructive use of parametric resonance, localized vibration modes, and nonlinear internal resonances. Applications to mass sensing, inertial sensing, frequency synthesis, and frequency conversion will be described. The work presented is the result of ongoing collaborations with Kimberly Turner at UCSB and Mark Dykman at MSU. Current and former MSU and UCSB graduate students Jeff Rhoads, Barry DeMartini, Nick Miller, Chris Burgner, Scott Strachan, Zi Yie, and Pavel Polunin have contributed significantly to this research. Support from the NSF Dynamical Systems program, the NSF Sensors and Sensor Systems program, and DARPA-MTO, is gratefully acknowledged. Biography Steve Shaw is a University Distinguished Professor in the Department of Mechanical Engineering at Michigan State University. He received an AB in Physics (1978) and an MSE in Applied Mechanics (1979) from the University of Michigan and a PhD in Theoretical and Applied Mechanics (1983) from Cornell University. He has held visiting appointments at Cornell University, the University of Michigan, Caltech, the University of Minnesota, the University of California-Santa Barbara, and McGill University. His research interests are in dynamical systems and mechanical vibrations, including mirco/nano-scale resonators with sensing and signal processing applications, and nonlinear vibration absorbers with automotive applications. Steve currently serves in editorial capacities for the SIAM Journal on Applied Dynamical Systems, Nonlinear Dynamics, and the ASME Journal of Vibration and Acoustics. He is a Fellow of ASME and recipient of several honors, including the SAE Arch T. Colwell Merit Award, the Henry Ford Customer Satisfaction Award, and the ASME Henry Hess Award. Alexander F. Vakakis W. Grafton & Lillian B. Wilkins Professor Department of Mechanical Science & Engineering University of Illinois at Urbana-Champaign Keynote Speaker Passive Nonlinear Targeted Energy Transfers: From Mechanical Oscillators to Multi-scale Interactions in Fluids Abstract By nonlinear targeted energy transfer – TET -- we denote passive, nearly one-way transfer of vibration or shock energy from an excited or self-excited primary system to a set of local, dissipative, essentially nonlinear (non-linearizable) attachments where energy is spatially confined and locally dissipated without 'spreading back' to the primary system. These attachments then act, in essence, as passive, broadband and adaptive boundary controllers or nonlinear energy sinks. After presenting the basic theoretical foundation for TET and the associated phenomenon of nonlinear resonance capture, we discuss applications of TET-based passive designs to diverse fields such as suppression of aeroelastic instabilities in subsonic and transonic flow regimes, blast and seismic mitigation designs for infrastructure, control of vortexinduced vibrations, vibration energy harvesting, and energy redirection in adaptive granular acoustic metamaterials. Moreover, recent results indicate that nonlinear TET may play an important role in multi-scale energy transfers governing turbulent flows. In particular, internal instabilities caused by essential nonlinearities in 'fluid oscillators' can lead to strong, irreversible, energy transfers between stable and unstable fluid modes, which are also equivalent to the existence of low-dimensional manifolds that attract the long-term dynamics. Hence, it may be that interesting links can be established between TET phenomena in mechanical oscillators and turbulent flows. Biography Alexander F. Vakakis received a PhD in Applied Mechanics from the California Institute of Technology (1990) under the supervision of Prof. T.K. Caughey (late), an MSc from Imperial College, London (1985) and a Diploma in Mechanical Engineering from the University of Patras, Greece (1984). He has published over 170 archival journal publications and three research monographs, and has edited two books in the fields of nonlinear dynamics and vibrations. Currently he serves as Associate Editor of the ASME Journal of Applied Mechanics and of Meccanica, and is Member of the Editorial Board of the Journal of Multi-body Dynamics (Part K of the Proceedings of the Institution of Mechanical Engineers) and the Journal of Mechanical Science and Technology. His current research work focuses on employing strongly nonlinear methodologies in mechanical design, vibration engineering and structural acoustics. Together with Larry Bergman he co-directs the Linear and Nonlinear Dynamics and Vibrations Laboratory at the University of Illinois at Urbana-Champaign. K. W. Wang Stephen P. Timoshenko Collegiate Professor and Department Chair Department of Mechanical Engineering University of Michigan Keynote Speaker Structural Dynamics Enhancement via Cross-Field Tailoring of Adaptive Structural Systems 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 built-in autonomous abilities, such as vibration and stability controls, shape configuration and morphing, materials and mechanical property variations, and health monitoring. From a structural system point of view, one of the major challenges is on how to best synthesize the cross-field 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 some of the recent interdisciplinary research efforts in adaptive structure dynamics and controls enhancement via multi-field tailoring. Biography Dr. Kon-Well Wang is the Stephen P. Timoshenko Collegiate Professor and 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. He joined the University of Michigan as Department Chair in 2008. Professor Wang's main technical interests are in adaptive structural systems and structural dynamics & controls. His work has cross-linked multiple fields, developed methodologies in synthesizing novel adaptive structures with piezoelectric circuitry networks, bio-inspired composites, nano-scale materials, or nonlinear devices for structural dynamics and controls enhancement. Professor Wang is a Fellow of the American Society of Mechanical Engineers, the Institute of Physics, and the American Association for the Advancement of Science. He has received various recognitions; 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. Professor Wang has been the 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.