Study on the bandwidth analysis of a tunable cantilever plate

¹ College of Mechanical Engineering, Beijing University of Technology - 100124 Beijing, China
² School of Statistics and Mathematics, Central University of Finance and Economics - 100190 Beijing, China

^(a) lihuachenli@yahoo.com

Received: 18 March 2019
Accepted: 3 June 2019

Abstract

Energy harvester can absorb ambient vibration to generate electricity, and it is urgent to introduce a larger working bandwidth in energy harvesting. In this paper, a tunable cantilever plate structure is designed by adding a box at each free edge of the cantilever along the x-direction, and one ball is placed in each box, respectively. The mode function of the tunable cantilever plate is given according to the deflection curve. The Hamilton principle is used to derive the dynamic equation of the system. The natural frequencies and bandwidths are solved according to the dynamic equation. The effects of some structural parameters, such as the thickness of plate, the mass of balls and the length of the box on frequency and bandwidth are analysed to search for a wider bandwidth, which can enable the energy harvester working at a broad range of frequency. A high-performance energy converter with wider bandwidth can be designed according to this tunable cantilever plate.