期刊
APPLIED PHYSICS LETTERS
卷 109, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4960792
关键词
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资金
- National Science Foundation [CMMI-1333978]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1333978] Funding Source: National Science Foundation
We explore the enhancement of 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 blind hole distribution is tailored to obtain a hyperbolic secant gradient profile 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 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. Published by AIP Publishing.
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