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Proceedings Paper

Optimal piezoelectric energy harvesting using elastoacoustic mirrors by frequency-wavenumber domain investigation
Author(s): Matteo Carrara; Jason A. Kulpe; Stephen M. Leadenham; Michael J. Leamy; Alper Erturk
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Paper Abstract

Recent work has demonstrated efficient transformation of structure-borne propagating waves into low-power electricity using metamaterial-inspired mirror configurations. Elastoacoustic waves (i) originating from a point source and (ii) arriving as plane waves have been successfully focused on a piezoelectric energy harvester using elliptical and parabolic mirror concepts, respectively. Our present work investigates the spatial optimization of a piezoelectric energy harvester domain weakly coupled to a thin plate housing an elastoacoustic mirror (or lens). Mirrors considered include elliptical arrangements of periodic stubs, and an elliptical arrangement of continuous material. Spatial and temporal transformation of the wave propagation field into the frequency- wavenumber domain is performed in order to identify the wavenumber content inside the mirror. A frequency- domain root-mean-square (RMS) evaluation is then applied to the transformed field in order to extract the preferred propagation directions. Computational modeling and experimental testing are employed to quantify performance enhancement of the presented approach. Specifically, dramatic enhancement of the harvested power output is reported by patterned electroding of a rectangular PVDF harvester in the elliptical mirror domain.

Paper Details

Date Published: 9 March 2014
PDF: 10 pages
Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 905705 (9 March 2014); doi: 10.1117/12.2044960
Show Author Affiliations
Matteo Carrara, Georgia Institute of Technology (United States)
Jason A. Kulpe, Georgia Institute of Technology (United States)
Stephen M. Leadenham, Georgia Institute of Technology (United States)
Michael J. Leamy, Georgia Institute of Technology (United States)
Alper Erturk, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 9057:
Active and Passive Smart Structures and Integrated Systems 2014
Wei-Hsin Liao, Editor(s)

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