ABSTRACT

The present study presents the application of a structural optimization scheme for a Double Split Hollow Sphere (DSHS) based acoustic cloaking structure for irregular surfaces. For acoustic wave cloaking, many scientific devices utilizing phase differences have been developed. Considering the irregular surfaces of objects to be concealed, acoustic wave reflections become complex with random phase differences and determinations of the involved geometric parameters of cloaking structures become impractical. To determine the geometric parameters of acoustic cloaking devices with DSHS systematically, the present study applies a structural optimization scheme. The present scheme computes and minimizes the differences between the acoustic pressures reflected from irregular surfaces and the reference acoustic pressures without irregular surfaces by optimizing the location and geometric parameters of the DSHS. To show the validity of the present scheme, structural optimization problems are solved for several three-dimensional problems with complex and irregular surfaces.

摘要

本研究提出了一种结构优化方案在基于双分裂空心球 (DSHS) 的不规则表面声学隐形结构中的应用。对于声波隐形，已经开发了许多利用相位差的科学设备。考虑到要隐藏的物体的不规则表面，声波反射变得复杂，具有随机相位差，确定隐身结构所涉及的几何参数变得不切实际。为了系统地确定DSHS声学隐形装置的几何参数，本研究采用了结构优化方案。本方案通过优化DSHS的位置和几何参数来计算并最小化从不规则表面反射的声压与没有不规则表面的参考声压之间的差异。为了证明本方案的有效性，解决了几个具有复杂和不规则表面的三维问题的结构优化问题。