Abstract:Piezoelectric cantilever beam is widely used in the design of vibration energy harvesters. However, long-term bearing vibration load can easily lead to fatigue damage and failure to piezoelectric body. The purpose of this article is to investigate a life prediction method of a piezoelectric cantilever beam based on voltage, and realize the life prediction of a piezoelectric cantilever beam. Firstly, a vibration test system was designed to test the resonance frequency, generating voltage and numbers of cyclic loading of piezoelectric cantilevers. Thereafter, the damage was defined by the measured resonance frequency. And the relationship of the voltage change and damage was established. Finally, the remaining life prediction model of a piezoelectric cantilever was established by the ratio of voltage change as the damage indicator, and the accuracy of the prediction model was verified by the testing results. Results indicate that the model can predict the remaining life of piezoelectric cantilever beams under the excitation of resonance frequency band, and the prediction error is smaller than 15% as the damage rate D is in the range of 0.4 ~ 0.8, and the error is smaller than 5% as the damage rate D is in the range of 0.8 ~ 1, but the error is large as D is less than 0.4.
吴兴意,刘文光,胡剑波,方孟翔,高铭阳. 基于电压的压电悬臂梁剩余寿命预测[J]. 振动与冲击, 2022, 41(7): 223-227.
WU Xingyi, LIU Wenguang, HU Jianbo, FANG Mengxiang, GAO Mingyang. Residual life prediction of piezoelectric cantilever beam based on voltage. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(7): 223-227.
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