Design and performance analysis of the low-frequency and broadband piezoelectric energy harvester

2017 3rd International Conference on Applied Materials and Manufacturing Technology

Laizhao, J.^1,2 ; Rui, H.^1,2 ; Weike, W.^1,2

School of Mechanical Engineering, Shandong University, Ji'nan

250061, China^1

Key Lab. of High Efficiency and Clean Mechanical Manufacture, Shandong University, Ministry of Education, Ji'nan

250061, China^2

关键词: Effective frequency bands;    Energy Harvester;    External excitation;    High frequency HF;    ITS applications;    Performance analysis;    Piezoelectric energy harvesters;    Resonance frequencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/242/1/012098/pdf
DOI  :  10.1088/1757-899X/242/1/012098

来源: IOP

【 摘 要 】

A novel type energy harvester composed with n masses and n beams was proposed to solve the problems of high-frequency and narrow band of cantilever energy harvester to improve its energy conversion efficiency, and broaden its application. Firstly, We taken micro beam as the research object, improved its dynamic model with size effect, then verified it by experiments. Secondly, the dynamic model was established based on the improved one, and its response and the output voltage of the external excitation was deduced formula. Finally, the performance was studied when n=2. The results show that resonance frequency was obvious reduced, and there are two frequency points less than 50Hz, 15.25 Hz and 23.08 Hz. Moreover, when the effective output voltage reached 80 mv, the effective frequency band was 20.32 Hz, which can make up for the energy conversion efficiency of single resonant frequency harvester.