基于变换声学的角反射器的设计*

基于超材料的新型声学器件是近年来的研究热点,变换声学为这些新型声学器件的实现带来了可能。该文提出了一种基于变换声学的声反射器模型的设计方法。通过简单的线性映射,该声反射器具有均匀而各向异性的参数。利用Biot流体等效介质理论,通过周期分层结构可以对该反射器进行实现。仿真结果显示,在一定角度范围内,该反射器可以将声波按照入射方向进行反射,同时也验证了该结构的宽频有效性。

The design of acoustical corner reflector based on transformation acoustics

New devices based on metamaterials have attracted much attention in the past few years. The transformation acoustics provide the way to design these devices. In this paper, we propose a design approach of an acoustical retrodirective reflector. Based on the linear mapping rules, the acoustical retrodirective reflector requires homogeneous but anisotropic parameters. By utilizing the Biot fluid theory, this device can be further realized by periodic layered fluids. The simulated results show that the acoustical retrodirective reflector can work in a range of angles. Meanwhile, it also demonstrates that this device has a good performance over a wide operating band.