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

Youngsu Cha, Linfeng Shen, Maurizio Porfiri

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Article number055027
JournalSmart Materials and Structures
Volume22
Issue number5
DOIs
StatePublished - May 2013

Fingerprint

torsional vibration
Energy harvesting
Vibrations (mechanical)
Polymers
Metals
composite materials
Composite materials
polymers
metals
Hydrodynamics
hydrodynamics
Fluids
energy
transient response
viscous fluids
Transient analysis
excitation
boxes
radiant flux density
Damping

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Civil and Structural Engineering
  • Condensed Matter Physics
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Energy harvesting from underwater torsional vibrations of a patterned ionic polymer metal composite. / Cha, Youngsu; Shen, Linfeng; Porfiri, Maurizio.

In: Smart Materials and Structures, Vol. 22, No. 5, 055027, 05.2013.

Research output: Contribution to journalArticle

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