报告题目： Piezoelectric Vibration Energy Harvesters
报 告 人：廖亚斌 教授
工作单位：The Pennsylvania StateUniversity（宾州州立大学）
YabinLiao is an Assistant Professor in Engineering at Pennsylvania State University,The Behrend College. His research lies in energy harvesting, vibration anddamping. Dr. Liao received his Ph.D. in Mechanical Engineering in 2005, andM.S.E. in Electrical Engineering in 2004, both from Arizona State University.Before that he received his B.E. in Automotive Engineering in 1999 fromTsinghua University. He taught in the Department of Mechanical and AerospaceEngineering at Arizona State University from 2006-2017 before he joined PennState Behrend in 2017. Dr. Liao has published 11 articles in journals such asSmart Materials and Structures, Journal of Sound and Vibration, and Journal ofIntelligent Material Systems and Structures. He is a regular reviewer for morethan 9 international journals, and a member of ASME.
报告概况：Energy harvesting is the process of capturingthe ambient surrounding energy and converting it into usable electrical energy.The concept of power harvesting works toward developing self-powered devices thatdo not require replaceable power supplies, for example, wireless sensors forstructural health monitoring, control systems, and wearable medical devices.Piezoelectrics have the ability that generates an electric charge in responseto applied mechanical stress, making it a suitable material for energyharvesting from vibration, which is abundant in environment. This presentationprovides a complete and system-level overview of the modeling and analysis ofpiezoelectric vibration energy harvesters. First it discusses the mechanicalmodeling of energy harvesters, resulting in an equivalentsingle-degree-of-freedom (SDOF) system. Then the equivalent system is linked tothe energy harvesting circuit interface through the equivalent circuit andimpedance technique. Lastly, the behavior of energy harvesters connected todifferent circuit interfaces such as resistive (REH), standard (SEH), andsynchronized switch harvesting on inductor (SSHI) are discussed, mostimportantly, the concept of power limit and the effect of electromechanicalcoupling.