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Modeling and Analysis of Piezoelectric Vibration Energy Harvesters
Date: 2018/7/23             Browse: 33

Speaker:     Prof. Yabin Liao

Time:          10:00—11:00, July 23

Location:    Room 1A-200, SIST Building

Host:          Prof. Junrui Liang

Abstract:

In the past few decades, research and development in renewable energy have exploded. 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. Vibration energy harvesting can be achieved by using electro-mechanical transducers such as electromagnetics, electrostatics or piezoelectrics. 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. Recent advances in microelectronics technologies have led to a reduction in power consumption of microelectromechanical (MEMS) wireless sensor systems, to the low mW level or even μW level, making piezoelectric energy harvesting a viable solution to self-powered wireless sensors today.

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 techniques. 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.

Bio: 

Yabin Liao is an Assistant Professor in Engineering at Pennsylvania State University-Erie, 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 Erie in 2017. Dr. Liao has published 10 articles in journals such as Journal of Sound and Vibration, Smart Materials and Structures, and Journal of Intelligent Material Systems and Structures. He is a regular reviewer for more than 9 international journals, and a member of ASME.

SIST-Seminar 18054