Abstract
Vortex Induced Vibration (VIV) of an oscillating single circular cylinder elastically supported by cantilever plate springs enhances an oscillation to utilize flicking piezoelectric hydro generator for not only steady-uniform flow but also unsteady and pulsating flow field in a small open channel and a seawater exchanger. In this article, vibration characteristics of the cylinder in unsteady flow and pulsating flow are mentioned first. Then, a novel type of energy harvester using flicking motion was developed. The flicking generator in which a vibrating cylinder flicks a bimorph piezoelectric sheet was evaluated in various flow fields. As the result, relatively large amplitude was achieved in steady-uniform flow field and unsteady flow field. In pulsating flow field, resonance amplitude with the lock-in frequency was obtained when the inlet velocity reaches or exceeds a threshold value. Flicking motion provides higher output voltage, and the flicking VIV generator allow further extension of a charging output into a battery has a highly possible to drive wireless environmental monitoring system.
