基于人工梯度结构的声传输特性分析

为了使声波产生不同于传统天然声学材料的反常传输特性,使其在声通信、声探测及声波低损耗定向传输等方面提供新思路,采用COMSOL有限元方法模拟了声波在局域共振型人工梯度结构中的传播特性。仿真结果表明:在波平面经过一系列的低传输后,所设计模型吸收了大多数的入射声波,与此同时,在模型的另一侧,声波重新在出射声波处汇聚出了一个全新的焦点。此外,越接近共振频率,声波的传输特性便相对越好,由于人工声学结构具有设计灵活性及可调控性,因此在实际应用中可以根据具体情况进行结构的设计,使其满足传输声波信号所需的共振频率,以此提高声波传输效率,为实际水下声源探测、声波通信等提供新思路。

Analysis of acoustic transmission characteristics based on artificial gradient structure

In order to generate anomalous transmission characteristics different from traditional natural acoustic materials and provide new ideas for acoustic communication, acoustic detection and directional transmission with low loss, COMSOL finite element method was used to simulate the propagation characteristics of acoustic waves in local resonant artificial gradient structures. The simulation results showed that after a series of low transmission in the wave plane, the designed model absorbed most of the incident acoustic waves. At the same time, on the other side of the model, the acoustic waves gathered a new focus at the exit acoustic waves. In addition, the closer the resonant frequency, the transmission properties of acoustic waves was relatively better. Because the artificial acoustic design flexibility and control structure, so can according to the specific situation in the practical application in the design of the structure, make its resonant frequency acoustic signal transmission needs, to improve the efficiency of acoustic wave transmission, such as practical underwater acoustic source detection, acoustic communication provides new train of thought.