Abstract
This paper presents a 2-DOF piezoelectric energy harvester for vortex-induced vibrations. This 2-DOF structure is composed of an outer beam, an inner beam, a cylinder and tip masses attached to the beams. The inner beam is attached to the free end of the outer beam to make the first two resonant frequencies of the structure close. This 2-DOF harvester is meant to improve the harvesting range and scavenge wind energy even when the wind speed is beyond the lock-in range. A prototype is fabricated and experimentally tested in a wind tunnel. A 1-DOF piezoelectric energy harvester is also built for comparison. The experimental results show that the 2-DOF design achieves higher voltage than the 1-DOF counterpart at both low speed and high speed. A parametric study of the tip masses is also conducted to understand their impact on the harvesting voltage.
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