In order to improve energy conversion efficiency of wind energy harvester, a piezoelectric wind energy harvester with resonant cavity was proposed. A mathematical model for the piezoelectric wind energy harvester was established considering the relationship among wind fluid, structural vibration and output power. The simulation analysis was performed based on the model to study the effects of structural parameters of the energy harvester and wind speed on its generating capacity. The piezoelectric wind energy harvester prototypes were fabricated and used to conduct tests. The test results showed that the output power of the piezoelectric wind energy harvester with resonant cavity is larger than that of the harvester without resonant cavity within a lower wind speed range of 2m/s - 12m/s.
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