Abstract： 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.
2019, Vol. 40 
