Modelling of micro vibration energy harvester considering size effect

2017 3rd International Conference on Applied Materials and Manufacturing Technology

Li, Chuangye^1,2 ; Huo, Rui^1,2 ; Wang, Weike^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: Dynamic equations;    Equivalent Young's modulus;    Experimental platform;    Macroscopic model;    Output voltages;    Piezoelectric cantilever beams;    Tip displacement;    Vibration characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/242/1/012066/pdf
DOI  :  10.1088/1757-899X/242/1/012066

来源: IOP

【 摘 要 】

Considering increase of stiffness caused by size effect, equivalent Young's modulus was introduced for futher analysis. Experimental platform was established to test vibration characteristics. Dynamic equation for micro piezoelectric cantilever beam considering size effect was studied with finite element analysis and experiment. Results shows it is accurate. Based on that, dynamic model for micro vibration energy harvester was improved, a T-type micro vibration energy harvester was designed and fabricated. Resonant frequency, tip displacement and output voltage of the harvester were obtained. Comparing with macroscopic model for vibration harvester, improved one reduces errors by 13%, 35% and 22%.