In order to complete the conversion of environmental energy to electric energy,an energy conversion device using piezoelectric element to convert environmental energy is designed. The device uses a wind-driven cantilever-arm type pressure-generating component to rotate while the piezoelectric plate is vibrated to generate electrical energy.Based on the basic theory of piezoelectric materials, the output model of the device is established,and the evolutionary algorithm based on the state space model is used to optimize the design of the device.T...