Theoretical modeling and analysis of piezoelectric energy harvester with variable section overhanging beam

Abstract

With the development of integrated circuits, the volume and power consumption of electrical equipment have decreased dramatically. As an excellent energy conversion method, piezoelectric energy harvester can capture the vibration energy of the environment, so as to realize the self-powered supply of micro and small power electronic devices. In this paper, a variable cross-section extended beam structure is considered as the structure form of piezoelectric energy harvester. The influence of structural parameters on the steady-state response of piezoelectric energy harvester is analyzed, which can improve the output voltage and collection efficiency of the energy harvester. The results show that the thickness of the beam has a great influence on the natural frequency of the piezoelectric energy harvester system, but has little influence on the output response. By changing the thickness of the beam, the low-frequency energy can be captured and the energy collection efficiency can be improved. The thickness of the beam piezoelectric layer has a great influence on the natural frequency of the piezoelectric energy harvester system, but has little influence on the output response. By reducing the thickness of piezoelectric layer, the efficiency of energy collection can be improved.