报告题目: Exploiting the advantages of the centrifugal softening effect in rotational impact energy harvesting

报告人：Dr. Shitong Fang，The Chinese University of Hong Kong

邀请人：黄冬梅

报告时间：2021年10月15日9:00-10:00

腾讯会议ID：835 657 678

报告人简介：Dr. Shitong Fang received her B.S. degree from the Sun Yat-sun University in 2017 and Ph.D. degree from the Chinese University of Hong Kong in 2021. She is now the postdoctoral researcher at the Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong. Dr. Fang published more than 10 papers in international journals including Journal of Sound and Vibration, Applied Physics Letters, Mechanical Systems and Signal Processing, Nonlinear Dynamics, and Smart Materials and Structures, and one featured article selected by Applied Physics Letters and reported by the famous science highlight AIP Scilight by AIP Publishing. She is currently the reviewer for Journal of Intelligent Material Systems and Structures and Mechanical Systems and Signal Processing. Her research interests include energy harvesting technique, plucking and impact frequency-up conversion, bistability/multistability, centrifugal-softening and -stiffening effects and other nonlinear dynamics.

Abstract：A rotational impact energy harvester is presented by utilizing the centrifugal softening effect of an inverted driving beam in improving the energy harvesting performance of two piezoelectric beams at low rotational frequencies. By the proposed structure, the static divergence of the inverted driving beam in the deflected mode can not only be avoided but also be utilized. Numerical and experimental results show that the centrifugal softening effect can amplify the relative motion between the driving and generating beams and increase the impact force, which in turn improves the output power significantly. The maximum output power of the harvester is increased by 212.5%, 258.7%, and 682.8% for the impact gaps of 1.07 mm, 1.43 mm, and 2.14 mm, respectively. Moreover, the inverted driving beam can be prevented from continuously deflecting by introducing large impact stiffness at the contact instant.