Energy harvesting from underwater torsional vibrations of a patterned ionic polymer metal composite

Title
Energy harvesting from underwater torsional vibrations of a patterned ionic polymer metal composite
Authors
차영수Linfeng ShenMaurizio Porfiri
Issue Date
2013-05
Publisher
Smart materials & structures
Citation
VOL 22, NO 5, 055027
Abstract
In this paper, we study underwater energy harvesting from torsional vibrations of an ionic polymer metal composite (IPMC) with patterned electrodes. We focus on harmonic base excitation of a centimeter-size IPMC, which is modeled as a slender beam with thin cross-section vibrating in a viscous fluid. Large-amplitude torsional vibrations are described using a complex hydrodynamic function, which accounts for added mass and nonlinear hydrodynamic damping from the surrounding fluid. A linear black box model is utilized to predict the IPMC electrical response as a function of the total twist angle. Model parameters are identified from in-air transient response, underwater steady-state vibrations, and electrical discharge experiments. The resulting electromechanical model allows for predicting energy harvesting from the IPMC as a function of the shunting resistance and the frequency and amplitude of the base excitation. Model results are validated against experimental findings that demonstrate power harvesting densities on the order of picowatts per millimeter cubed.
URI
http://pubs.kist.re.kr/handle/201004/50986
ISSN
09641726
Appears in Collections:
KIST Publication > Article
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