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基于等效介质理论,提出了具有共焦层状结构的椭圆柱形声隐身衣设计方法.理论分析与有限元数值模拟表明,所设计隐身衣依然具有完美隐身衣典型特征,可使刚性圆柱体散射场明显减小,并且在隐身衣区域表现出波阵面弯曲的特性,同时在隐身衣外部波阵面保持不变.增加隐身衣离散层数可以拓宽其有效工作频带,改善隐身效果.由于是一种线变换隐身衣,隐身效果受到了入射波方向的影响,只有当入射波方向与椭圆长轴平行时效果最佳.另外当椭圆柱焦距非常小的时候,可近似认为是圆柱形隐身衣.仿真实验结果证明了方法的正确性.该研究为实现复杂形状声隐身衣提供了一种有效途径.
Based on the theory of equivalent medium, a design method of elliptic cylindrical invisible cloak with confocal layered structure is proposed.Theoretical analysis and finite element numerical simulation show that the designed stealthy underwear still possesses the typical features of perfect invisible clothes, which can make the rigid cylindrical body scatter Field significantly reduced, and in the cloak area performance wavefront bending characteristics, while the cloak outer wave front remained unchanged.Improving the number of discrete layers of stealth clothing can broaden its effective working frequency band to improve the stealth effect.Because yes A line transformation stealth coat, stealth effect by the incident wave direction, only when the incident wave direction parallel to the long axis of the ellipse when the best effect.In addition when the elliptic cylinder focal length is very small, it can be approximated as a cylindrical stealth clothing The result of simulation experiment proves the correctness of the method.The research provides an effective way to realize complex shape invisible cloak.