Finite Element Simulation Analysis of the Mechanical-electric Coupling Characteristics of Piezoelectric Energy Harvesters
Using the finite element method,the mechanical-electric characteristics of piezoelectric cantilever beams are numerically simulated,and the mechanical-electric characteristics of piezoelectric cantilever beams with different cross-sectional shapes are studied.We observe that the piezoelectric cantilever beam with a trapezoidal section has higher output voltage and first-order resonance frequency than that with a rectangular section.The effects of the length and position of the piezoelectric sheet and the thickness ratio of the substrate to piezoelectric sheet on the output performance are further analyzed.The results show that when the length of the piezoelectric sheet or the distance of the piezoelectric sheet from the fixed end are reduced,the output performance of the trapezoidal cantilever beam is enhanced,whereas the first-order resonance frequency decreases as the length of the piezoelectric sheet decreases or the distance from the fixed end increases.When the thickness ratio of the substrate to the piezoelectric sheet is 1.6,the electrical output of the trapezoidal cantilever reaches the maximum value,but the first-order resonance frequency increases with increasing thickness ratio.
piezoelectric cantilever beammechanical-electric characteristicsfinite element simulationstructural optimization
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