基于内多边形一阶共振效应的压电俘能风力发电OA北大核心

The existing piezoelectric oscillators that utilize transient shock vibration methods can generate large initial kinetic energy,but their structures are complex.Moreover,achieving first-order resonance under continuous transient shocks remains difficult,limiting both optimal am-plitude and output power.In this paper,a method and a device for wind transient shock piezoelec-tric energy harvesting are proposed based on an inner polygon structure.The device continuously ex-periences first-order resonance at a certain wind speed,resulting in high output performance.The proposed approach has the potential to transform the way wireless network node sensors are powered and improve the convenience of using the sensors.The theoretical analysis and numerical simulation results show that the device experiences first-order resonance with a frequency of 131.40 Hz under continuous transient shocks at a wind speed of 17.0 m·s-1.Experimental results show that the op-timal matching load for the device is 20 kΩ,producing a maximum power output of 4.73 mW.At this load,the power density of the piezoelectric ceramic chip in the device reaches 833.68 μW·cm-3.Compared with the non-first-order resonant state,the load power is at least doubled,effectively meeting the energy supply requirements of most wireless network node sensors.