Abstract: A novel multi-direction piezoelectric vibration energy harvester and a Rainbow shape piezoelectric transducer were proposed to harvest multi-direction ambient vibration energy in this paper. With the aim to enhance the output electric energy of the multi-direction vibration energy harvester, the dynamic model of the multi-direction vibration energy harvester and the output electric energy model of the Rainbow shape piezoelectric transducer were established. Furthermore, the maximum output electric energy was taken as the objective function and various factors such as metal flexible intensity, unit of frequency, sizes of the harvester were considered. Finally, the structure parameters of the multi-direction vibration energy harvester were optimized and the sequential quadratic programming method was applied in the optimization design. The results indicate that the output total electric energy of the multi-direction vibration energy harvester reaches 37.146μJ as the excitation direction along Y direction and the output total electric energy of the multi-direction vibration energy harvester reaches 58.715μJ as the excitation direction along the diagonal of the cubic shape metal framework. After optimization, the output total electric energy of the multi-direction piezoelectric vibration energy harvester are increased 30.82% and 29.24% respectively, the efficiency of the multi-direction vibration energy harvester improved excellently. The results provide sufficient basis for design, production and application of the multi-direction vibration energy harvester.
HOU Zhi-wei CHEN Ren-wen LIU Xiang-jian .
Optimization Design of Multi-direction Piezoelectric Vibration Energy Harvester[J]. Journal of Vibration and Shock, 2012, 31(16): 33-37
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