Abstract
As an analogue of the binary acoustic metasurfaces (BAMs), the sparse binary elastic metasurfaces (SBEMs) which consist of two different coding units with sparse arrangement is designed. A systematic design method based on topology optimization (TO) is developed to search the coding units. With the remarkable ability in regulating flexural waves, splitting and focusing of the flexural waves are achieved by using SBEMs. Furthermore, a piezoelectric disc is attached to the focus spot as a simple energy harvester. The output voltages are measured and the performance of the SBEM energy harvester is evaluated. Compared to a bare plate, the average power output on the SBEM is amplified significantly. The numerical simulation and experimental measurement are in good agreements. The good results prove the effectiveness of the SBEMs, and the design strategy provides a new routine for tailoring flexural waves.
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