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Underwater Energy Harvesting From Base Excitation of Ionic Polymer Metal Composites Undergoing Torsional Vibrations

[+] Author Affiliations
Youngsu Cha, Linfeng Shen, Maurizio Porfiri

Polytechnic Institute of New York University, Brooklyn, NY

Paper No. SMASIS2013-3125, pp. V002T07A012; 6 pages
  • ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • Volume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting
  • Snowbird, Utah, USA, September 16–18, 2013
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-5604-8
  • Copyright © 2013 by ASME


In this study, we investigate underwater energy harvesting from torsional vibration of a patterned ionic polymer metal composite (IPMC). The IPMC design consists of a rectangular polymer strip with patterned electrodes to split the top and bottom surfaces in two equal pairs. We focus on harmonic base excitation of an IPMC, which is modeled as a slender beam with thin cross section vibrating in a viscous fluid. Torsional vibrations with large–amplitude are described using a complex hydrodynamic function considering nonlinear hydrodynamic damping from the surrounding fluid. Along with the theoretical beam model, an electromechanical model is utilized to predict the IPMC electrical response from the torsional deformation of the beam. The integration of both models allows to predict the output voltage of the IPMC from the knowledge of the frequency and amplitude of base excitation. The theoretical predictions are validated against experiments.

Copyright © 2013 by ASME



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