11 April 2017 3D-printed lens for structure-borne wave focusing and energy harvesting
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In this paper, we explore 3D-printed Gradient-Index Phononic Crystal Lens (GRIN-PCL) for structure-borne focusing both numerically and experimentally. The proposed lens consists of an array of nylon stubs with different heights which is fabricated by 3D printing the PA2200 nylon. The orientation and height of the stubs are determined according to the hyperbolic secant gradient distribution of refractive index which is guided by finite-element simulations of the lowest asymmetric mode Lamb wave band diagrams. The fabricated lens is then bonded to an aluminum plate to focus the wave energy in the structure. The wave focusing performance is simulated in COMSOL Multiphysics® under plane wave excitation from a line source indicating that the focal points are consistent with the analytical beam trajectory results. Experiments are conducted with a scanning laser vibrometer and experimentally measured wave field successfully validates the numerical simulation of wave focusing within the 3D-printed GRIN-PCL domain. With a piezoelectric energy harvester disk located at the focal region of the GRIN-PCL larger power output is obtained 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.
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S. Tol, S. Tol, F. L. Degertekin, F. L. Degertekin, A. Erturk, A. Erturk, } "3D-printed lens for structure-borne wave focusing and energy harvesting", Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101641M (11 April 2017); doi: 10.1117/12.2260348; https://doi.org/10.1117/12.2260348

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