Fatigue life prediction of piezoelectric cantilever beam based on electromechanical response

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 314-322.

FENG Yiting, LIU Wenguang, WU Xingyi

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Abstract

Aiming at the fatigue problem of piezoelectric vibration energy harvester, the vibration fatigue life prediction method of piezoelectric cantilever beam based on electromechanical response is studied. Based on the residual stiffness theory and the "two-stage" fatigue life analysis model, a fatigue life prediction method of piezoelectric cantilever based on resonant frequency is proposed; The relationship model between the change of resonant frequency and the change of load power in the process of vibration fatigue is further analyzed, and a fatigue life prediction method of piezoelectric cantilever beam based on load power is proposed. The results show that the average error of the piezoelectric cantilever fatigue life prediction method based on resonant frequency is between 10%~ 20%, and the error range is controlled within 1.5 times the error line; The average error of the piezoelectric cantilever fatigue life prediction method based on load power is about 25%, and the error range is controlled within twice the error line, which belongs to the prediction effect of partial safety.

Key words

Piezoelectric cantilever beam / Vibration fatigue / Electromechanical response / Life prediction

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FENG Yiting, LIU Wenguang, WU Xingyi. Fatigue life prediction of piezoelectric cantilever beam based on electromechanical response[J]. Journal of Vibration and Shock, 2023, 42(17): 314-322

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