In this paper, we explore structure-borne elastic wave energy harvesting, both numerically and experimentally, by exploiting a Gradient-Index Phononic Crystal Lens (GRIN-PCL) structure. The proposed GRIN-PCL is formed by an array of blind holes with different diameters on an aluminum plate where the orientation and size of the blind holes are tailored to obtain a hyperbolic secant gradient distribution of refractive index guided by finite-element simulations of the lowest asymmetric mode Lamb wave band diagrams. Under plane wave excitation from a line source, experimentally measured wave field successfully validates the numerical simulation of wave focusing within the GRIN-PCL domain. A piezoelectric energy harvester disk located at the first focus of the GRIN-PCL yields an order of magnitude larger power output as compared to the baseline case of energy harvesting without the GRIN-PCL on the uniform plate counterpart for the same incident plane wave excitation. The power output is further improved by a factor of five using complex electrical load impedance matching through resistive-inductive loading as compared to purely resistive loading case.
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ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 28–30, 2016
Stowe, Vermont, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-5049-7
PROCEEDINGS PAPER
Dramatic Enhancement of Elastic Wave Energy Harvesting Using a Gradient-Index Phononic Crystal Lens Available to Purchase
Serife Tol,
Serife Tol
Georgia Institute of Technology, Atlanta, GA
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F. Levent Degertekin,
F. Levent Degertekin
Georgia Institute of Technology, Atlanta, GA
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Alper Erturk
Alper Erturk
Georgia Institute of Technology, Atlanta, GA
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Serife Tol
Georgia Institute of Technology, Atlanta, GA
F. Levent Degertekin
Georgia Institute of Technology, Atlanta, GA
Alper Erturk
Georgia Institute of Technology, Atlanta, GA
Paper No:
SMASIS2016-9264, V002T07A013; 7 pages
Published Online:
November 29, 2016
Citation
Tol, S, Degertekin, FL, & Erturk, A. "Dramatic Enhancement of Elastic Wave Energy Harvesting Using a Gradient-Index Phononic Crystal Lens." Proceedings of the ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 2: Modeling, Simulation and Control; Bio-Inspired Smart Materials and Systems; Energy Harvesting. Stowe, Vermont, USA. September 28–30, 2016. V002T07A013. ASME. https://doi.org/10.1115/SMASIS2016-9264
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