报告题目： Piezoelectric Vibration Energy Harvesters
报 告 人：廖亚斌 教授
工作单位：The Pennsylvania State University（宾州州立大学）
Yabin Liao is an Assistant Professor in Engineering at Pennsylvania State University, The Behrend College. His research lies in energy harvesting, vibration and damping. Dr. Liao received his Ph.D. in Mechanical Engineering in 2005, and M.S.E. in Electrical Engineering in 2004, both from Arizona State University. Before that he received his B.E. in Automotive Engineering in 1999 from Tsinghua University. He taught in the Department of Mechanical and Aerospace Engineering at Arizona State University from 2006-2017 before he joined Penn State Behrend in 2017. Dr. Liao has published 11 articles in journals such as Smart Materials and Structures, Journal of Sound and Vibration, and Journal of Intelligent Material Systems and Structures. He is a regular reviewer for more than 9 international journals, and a member of ASME.
报告简介：Energy harvesting is the process of capturing the ambient surrounding energy and converting it into usable electrical energy. The concept of power harvesting works toward developing self-powered devices that do not require replaceable power supplies, for example, wireless sensors for structural health monitoring, control systems, and wearable medical devices. Piezoelectrics have the ability that generates an electric charge in response to applied mechanical stress, making it a suitable material for energy harvesting from vibration, which is abundant in environment. This presentation provides a complete and system-level overview of the modeling and analysis of piezoelectric vibration energy harvesters. First it discusses the mechanical modeling of energy harvesters, resulting in an equivalent single-degree-of-freedom (SDOF) system. Then the equivalent system is linked to the energy harvesting circuit interface through the equivalent circuit and impedance technique. Lastly, the behavior of energy harvesters connected to different circuit interfaces such as resistive (REH), standard (SEH), and synchronized switch harvesting on inductor (SSHI) are discussed, most importantly, the concept of power limit and the effect of electromechanical coupling.