Abstract
This paper investigated the acoustic pressure characteristics analysis in cavity of the two-dimensional phononic crystal. Present phononic crystal is composed of PMMA cylindrical with square array embedded in air background. In order to obtain the band structures and acoustic pressure characteristics of the phononic crystal system, the plane wave expansion method and supercell are adopted and utilized. In addition, the effects of sizes and filling fractions are also investigated. Finally, the acoustic wave propagation and pressure characteristics in the PCs with point defect are simulated by the COMSOL Multiphysics software.
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