A direction adaptive hybrid piezo-electromagnetic energy harvester based on vortex-induced vibration

Abstract

This paper presents a direction adaptive energy harvester to scavenge multiple wind directions. A pair of rotatable hinges were fixed on a rotation axis to realize the orientation adaptive. The transverse bending vibration of piezoelectric beam induced by vortex shedding was converted into electricity while the change of relative position between magnets and coils output electricity too. The prototype of the energy harvester was fabricated and experiments were carried out. The harvester exhibited that the optimal power of piezoelectric and electromagnetic generation are, respectively, 5.19 mW and 0.32 mW in the wind speed range of 3.8 m/s to 6.4 m/s.