Increase output of vibration energy harvester by a different piezoelectric mode and branch structure design

Weiyang Qin, Qi Liu, Yuansheng Wang, Zhongliang Xie, Zhiyong Zhou

科研成果: 期刊稿件文章同行评审

2 引用 (Scopus)

摘要

In this study, we improve the performance of vibration energy harvesting by adopting a different working mode of piezoelectric material. We propose a harvester that is composed of an inverted beam and a branch structure. The branch can produce an amplified inertial force under vibration and passes it to a lead zirconate titanate (PZT) sheet. The resultant force acts on the PZT sheet as a dynamic normal force, not as a dynamic flexural one in the classical harvester. This change can increase the output significantly. First, the theoretical model is established and solved. The results show that the design can induce a super-harmonic vibration and produce a large output. Then, the validation experiments are carried out. The experimental results prove the occurrence of super-harmonic vibration and show that under weak stochastic excitation the branch structure can promote the electric output significantly. For a stochastic excitation of PSD = 0.06 g2 Hz−1, the average power of the novel harvester can reach 0.344 mW by a small PZT sheet with the dimensions of 24 × 6 × 0.2 m m 3 . This study may provide a novel scheme in improving the vibration energy harvesting efficiency.

源语言英语
文章编号034001
期刊Journal of Physics D: Applied Physics
56
3
DOI
出版状态已出版 - 29 12月 2022

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