中文摘要：

研究了二维声子晶体点缺陷的声能俘获系统,这种声子晶体是由水圆柱体散射体插在水银中组成的.数值结果表明声波局域在点缺陷处,通过放入压电片可俘获声能.采用一种新颖的优化方法,即在点缺陷中引入第三组元,计算寻找高质点速度场,预知压电片最优的位置和结构,获得了最优的声能俘获系统.结果还发现低密度的缺陷圆柱体在高密度流体基体下更利于声波局域和声能俘获.

英文摘要：

In this paper, the authors investigate the optimization of acoustic energy harvesting based on two-dimensional phononic crystal consisting of water cylinders in mercury background with a point defect . The numerical results show that the acoustic waves are localized and energy can be harvested by using pi-ezoelectric film.The position of the highest particle velocity predicts the optimum position and structure of the piezoelectric film.By introducing the third component in the point defect, the optimum acoustic ener-gy harvesting is obtained.It is found that the low density of the defect cylinder is of great advantage to a-coustic localization and energy harvesting.