Modeling of a micro vibration energy harvester considering size effect

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (12) : 148-152.

LI Chuangye1,2,HUO Rui1,2,WANG Weike1,2,ZHAO Chen3

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Abstract

Young’s modulus changes in micro world with size effect.Considering this, a micro piezoelectric cantilever beam was analyzed by ANSYS.A vibration characteristics experimental platform was established.Considering size effect, the dynamic equation of the micro beam was studied.Results show that it is accurate.The dynamic model of micro vibration energy harvester was improved based on that.A T-type micro vibration energy harvester was designed and fabricated.Resonant frequency, tip displacement and output voltage of the harvester were obtained.Comparing with the macroscopic model of vibration harvester, the improved model reduces errors by 13%，35%, and 22%.

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Size effect / Energy harvester / Modelling / Piezoelectric cantilever beam

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LI Chuangye1,2,HUO Rui1,2,WANG Weike1,2,ZHAO Chen3. Modeling of a micro vibration energy harvester considering size effect[J]. Journal of Vibration and Shock, 2019, 38(12): 148-152

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