动态多稳态压电风能俘能结构设计与实验验证

The traditional flutter wind energy harvester is found to be inefficient for variable-speed wind. Aiming at solving this problem, this paper proposes a dynamic multi-stable flutter piezoelectric energy harvester capable of maintaining a high voltage output over a wide range of wind speeds. This structure consists of a cantilever with a rectangular flat plate and a tip magnet, a pair of fixed magnets and a piezoelectric patch. It owns two static and one dynamic equilibrium positions. To prove the harvester's superior performance, a prototype is fabricated. The validation experiments are carried out at different wind speeds. The results show that this harvester exhibits bi-stable characteristics at a low wind speed, and tri-stable characteristics at a high wind speed. For high-speed wind, an additional neutral equilibrium position emerges and becomes stable gradually. The results show that this harvester outperforms the traditional one over a wide range of wind speeds. It can execute snap-through and even coherent resonance at the wind speed varying from 2.0 m/s to 7.5 m/s, thus keeping a large output for the variable-speed wind.