Abstract
The property of piezoelectric material was one of the keys to optimize energy harvester based on piezoelectric effect. In this paper, the relation between the parameters of piezoelectric material and the performance of circular diaphragm energy harvester was studied. Theoretical analysis and idiographic experiment were combined to estimate the dependence of output power on the material parameters: piezoelectric coefficient d33 and dielectric constant e. The results show piezoelectric material with high-d33 and low-e was good for increasing the output power of energy harvester, and the influence of piezoelectric coefficient is more obvious than that of dielectric constant. Among soft PZT, material PZT-51 could best fit energy harvesting. By optimizing PZT material, the energy harvester using single piezoelectric circular diaphragm could generate a maximum power of 9.08 mW for a matching load about 45 kΩ and a tip mass of 30 gat its resonant frequency of 178 Hz.
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