A Double Bi-stable Energy Harvester for Enhanced Ability of Bi-stable Energy Harvesting from Random Vibration

Jinshan  Wang; Zengcai Wang

doi:10.6180/jase.2017.20.3.13

A Double Bi-stable Energy Harvester for Enhanced Ability of Bi-stable Energy Harvesting from Random Vibration

Jinshan Wang^1,2 and Zengcai Wang This email address is being protected from spambots. You need JavaScript enabled to view it.^1,2

¹School of Mechanical Engineering, Shandong University, Jinan 250061, P.R. China
²Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Jinan 250061, P.R. China

Received: March 1, 2017
Accepted: May 8, 2017
Publication Date: September 1, 2017

Download Citation: ||https://doi.org/10.6180/jase.2017.20.3.13

ABSTRACT

In order to improve the efficiency of the bi-stable piezoelectric energy harvester (BEH), a double bi-stable energy harvester (DBEH) is proposed. The four piezoelectric cantilever beams which have a magnet in free end are put together. So each magnet is subjected to three force of magnetic repulsion. It can pull down the potential barrier and can make it easier to jump between potential wells. The double bi-stable energy harvester can realize snap-through at lower excitation than bi-stable energy harvester. The potential energy and the electro-mechanical equation of the DBEH are derived. Simulations and validation experiments are designed and carried out. The simulation results show that double bi-stable energy harvester can harvest more energy than bi-stable piezoelectric energy harvester at different levels of excitations. The experimental results are in agreement with the simulations, which prove that the double bi-stable energy harvester is preferable to bi-stable piezoelectric energy harvester in harvesting energy from random vibration.

Keywords: Double Bi-stable Energy Harvester, Dynamic Response, Output Voltage

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