Optimal piezoelectric energy harvesting using elastoacoustic mirrors by frequency-wavenumber domain investigation

Matteo Carrara; Jason A. Kulpe; Stephen M. Leadenham; Michael J. Leamy; Alper Erturk

doi:10.1117/12.2044960

9 March 2014 Optimal piezoelectric energy harvesting using elastoacoustic mirrors by frequency-wavenumber domain investigation

Matteo Carrara, Jason A. Kulpe, Stephen M. Leadenham, Michael J. Leamy, Alper Erturk

Author Affiliations +

Proceedings Volume 9057, Active and Passive Smart Structures and Integrated Systems 2014; 905705 (2014) https://doi.org/10.1117/12.2044960
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

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.

Citation Download Citation

Matteo Carrara, Jason A. Kulpe, Stephen M. Leadenham, Michael J. Leamy, and Alper Erturk "Optimal piezoelectric energy harvesting using elastoacoustic mirrors by frequency-wavenumber domain investigation", Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 905705 (9 March 2014); https://doi.org/10.1117/12.2044960

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