Discrepancy between galloping theory and experiment on a MEMS piezoelectric wind energy harvester

This paper reports a detailed experimental investigation of a galloping-based MEMS piezoelectric wind energy harvester (WEH) for the first time. As the galloping theory predicts, the harvester experiences a stable self-oscillation with large amplitude when the wind speed is equal to or higher than the onset speed of galloping. But the behavior deviates from the theory when wind speed is a little lower than the galloping speed. Inspired by the deviation, a method is proposed to improve the scavenging efficiency of wind by utilizing the coupling of the vortex-induced vibration and galloping. The current galloping theory needs to be expanded to include the effects of vortex shedding and/or turbulence for developing efficient MEMS WEHs.

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