【作者】 赵思缘； 胡博； 王思源； 潘琳琳； 莫世奇； 谭鹏；

【Author】 ZHAO Siyuan;HU Bo;WANG Siyuan;PAN Linlin;MO Shiqi;TAN Peng;Harbin Engineering University, College of Hydroacoustic Engineering;Harbin Engineering University, Key Laboratory of Underwater Acoustic Technology;Key Laboratory of Ocean Information Acquisition and Security, Ministry of Industry and Information Technology (Harbin Engineering University),Ministry of Industry and Information Technology;

【机构】 哈尔滨工程大学水声工程学院； 哈尔滨工程大学水声技术重点实验室； 海洋信息获取与安全工信部重点实验室(哈尔滨工程大学)工业和信息化部；

【摘要】 由于水中声波波长是同频率空气声波波长的近5倍,相对于空气声而言同频率的水下声波更难控制。为了解决水下声学超表面尺寸大的问题,根据广义斯奈尔定律以及声边界条件原理,构建了一种厚度为0.3λ的声学超表面,超表面的单元由上下两层阻抗不同的介质组成。通过有限元软件进行仿真,研究周期宽度以及入射角度的改变对声学超表面反射性能的影响。研究结果如下:仿真验证了本文设计的声学超表面可以实现良好的异常反射现象;在固定入射角度的情况下,增加周期宽度会使异常反射角度减小;当入射角度从小于临界角变化到大于临界角时,反射角度会发生突变,并且随着入射角绝对值的增加,反射系数逐渐下降。更多还原

【Abstract】 Since the wavelength of the underwater sound wave is nearly 5 times that of the air sound wave of the same frequency, the underwater sound wave of the same frequency is more difficult to control than the air sound. In order to solve the problem of the large size of the underwater acoustic metasurface, an acoustic metasurface with a thickness of0.3λ was constructed according to the generalized Snell’s law and the principle of acoustic boundary conditions. The unit of the metasurface is composed of upper and lower layers of medium with different impedances. The finite element software is used to simulate the effect of the change of the period width and the incident angle on the reflection performance of the acoustic metasurface. The research results are as follows: simulations verify that the acoustic metasurface designed in this paper can achieve good anomalous reflection phenomenon; in the case of a fixed incident angle, increasing the period width will reduce the anomalous reflection angle; when the incident angle changes from less than the critical angle to greater than When the critical angle is reached, the reflection angle will change abruptly, and with the increase of the absolute value of the incident angle, the reflection coefficient will gradually decrease.更多还原