Research on Spiral Piezoelectric Harvester with Variable Section

摘要

This paper presents an analytical model derived for obtaining the dynamic performance of a thin curved laminated piezoelectric beam with variable curvatures and transverse sections for the MEMS piezoelectric vibration energy harvester. The curved beam theory with rectangular section is employed to explore the bending and twisting coupling vibration characteristics. In order to satisfy the most available environmental frequencies, the effects of the tip proof mass on the spiral laminated beam with PZT-5A bonded on the surface is analyzed to provide a method of how to design low resonance beams while keeping the compacting structural assembly. The adoption of ANSYS software to carry out the MEMS piezoelectric vibration energy harvester's numerical simulation can improve the efficiency of the harvester designing and manufacturing consumedly. The results show that increases of the proof mass tend to shift the resonant frequencies down. The trend is consistent with the frequency expression of the simple mechanical structure in which the frequency is proportional to 1/m~(1/2). The simulation data will provide a theory analysis foundation for the engineering, design and application of harvester.