动态多稳态压电风能俘能结构设计与实验验证

传统的线性颤振式风能俘能结构在变风速环境下转换效率不高。针对此问题，本文提出了一种动态多稳态颤振式压电俘能结构，可在较宽的风速范围内保持较高的电压输出。该结构由矩形平板、压电悬臂梁与3块永磁体组成，并通过磁吸力实现结构的多稳态。通过在不同风速下开展的能量转换特性实验研究，发现当风速较小时，该结构具有双稳态特性；而当风速较大时，会出现新的稳定位置，结构变为三稳态系统。这样的动态稳定位置，可以保证结构在很宽的风速范围内出现阱间跳跃，进而保持大的电能输出。实验结果表明，这种动态多稳态结构，风速在2.0m/s—7.5m/s区间变化时，能够激发并保持阱间跳跃，甚至相干共振，产生较大的电能输出。

Design and experimental verification of dynamic multi-stable piezoelectric wind energy harvester

Aiming to overcome the inefficiency of flutter energy harvester for altering speed wind, a dynamic multi-stable flutter piezoelectric wind-energy-harvester was proposed in this paper. This harvester consists of a cantilever with a rectangular plate, three magnets and a piezoelectric patch. To prove the harvester’s superior performance in scavenging wind energy, a prototype was fabricated, and the validation experiment was carried out with the wind speed altering. The results show that the wind energy harvester exhibits the bi-stable characteristic for low wind speed; whereas it exhibits the tri-stable characteristic for high wind speed, in which case a neutral equilibrium position emerges and becomes stable gradually. The dynamic multi-stable harvester could execute snap-through and even coherent resonance for the wind speed ranging from v=2.0 m/s to v=7.5 m/s, thus it could generate a high output over the wide range of wind speed.