Theoretical model and simulations of piezoelectric cantilever generators

WANG Hao-jin， WU Dan-yan， XIAO Jin， WANG Guang-qing
（College of Information and Electronics Engineering， Zhejiang Gongshang University, Hangzhou 310018，China）

Abstract：In order to solve the problems of improving the piezoelectric cantilever power generation capacity，the piezoelectric power generation technology was investigated. After the analysis of piezoelectric vibration theory，the expressions between piezoelectric material’s thickness ，length and cantilever’s material ，length had on the generating ability of the device was established. A method was presented to mathematical modeling. The capacity of cantilever piezoelectric power generation device was evaluated on the theory，the Matlab simulations were tested. The experimental result shows that，for piezoelectric cantilever generators，there is a best thickness ratio for the cantilever material，and the best thickness decreases as the Young modulus increases when the material is different，and when the output impedance equals to materials’ input impedance，the output power is at its maximum.
Key words： piezoelectric； cantilever； simulation