Low-Frequency Ultra-Wideband Underwater Acoustic Diffusion Stealth Based on Locally Resonant Encoded Metasurface
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edited-by
(Contributed by WANG Yanfeng, M.AMM Youth Editorial Board)-
摘要: 水声隐身对提升水下设备的生存与工作能力意义重大. 该文提出了一种基于局域共振编码超表面的水下低频超宽带声扩散隐身方法. 首先，建立了局域共振超表面单元的声振耦合等效模型，揭示了倒“T”分形结构调制水下反射声波相位的力学机理，并基于遗传算法对宽频编码单元进行了协同优化设计. 进一步，依据编码调控理论，优化了宽频范围内具有良好扩散性能的超表面编码序列. 最后，针对该超表面开展了数值模拟和试验测试. 结果表明：具有倒“T”分形结构的超表面编码单元，在深亚波长尺度展现出良好的超宽频调相性能；编码超表面可在300~1 500 Hz的低宽频范围内实现水下扩散隐身；试验与仿真结果基本一致. 该工作为水下低频超宽带的声学隐身提供了新的途径.Abstract: Underwater acoustic stealth is of great significance for improving the survival and working capabilities of underwater devices. A method for underwater low-frequency ultra-wideband acoustic diffusion stealth based on the locally resonant coded metasurface was proposed. Firstly, an equivalent model of acoustic-vibration coupling for locally resonant metasurface elements was established, revealing the mechanical mechanism of an inverted T-shaped fractal structure in modulating the phases of underwater reflected acoustic waves. Then, a collaborative optimization design of the broadband coded elements was carried out based on the genetic algorithm. Furthermore, based on the coding theory, the coding sequence of the metasurface with superior diffusion performance within the broadband range was optimized. Finally, numerical simulations and experimental tests were conducted for this metasurface. The results show that, the metasurface coding element with an inverted T-shaped fractal structure can exhibit excellent ultra-wideband phase modulation performance at the deep sub-wavelength scale. The coded metasurface can achieve underwater diffusion stealth in the low broadband frequency range of 300~1 500 Hz. The experimental results are basically consistent with the simulation results. The research provides a new approach for underwater low-frequency ultra-wideband acoustic stealth.
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Key words:
- acoustic diffusion stealth /
- low-frequency broadband /
- underwater acoustic metasurface /
- acoustic-vibration coupling /
- inverse design
edited-byedited-by1) (我刊青年编委王艳锋来稿) -
图 1 局域共振单元的几何构型及其声振耦合等效模型
Figure 1. The geometric configuration of local resonance elements and the acoustic-vibration coupling equivalent model
图 2 2-bit编码单元的优化
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.
Figure 2. 2 Optimization of the 2-bit encoding element
图 3 超表面单元和编码序列设计
Figure 3. The element and encoding sequence design of the metasurface
图 4 垂直入射编码超表面的模拟结果
Figure 4. Simulation results of the encoded metasurface under normal incidence
图 7 参考平板、超表面样品的试验和模拟结果
Figure 7. The experimental and simulated results of the reference plate and the metasurface sample
表 1 2-bit宽频单元表面的零阶法向位移D1，反射相位半解析解φana和模拟解φsim
Table 1. Zero-order normal displacements of the surface of the 2-bit broadband element, semi-analytical solutions of the reflection phase, and simulated solutions
frequency/Hz coding element “00” “01” “10” “11” 300 D1/(10－10 m) 0.318+7.036i -3.392+2.565i -1.498+0.334i 2.343+6.159i φana/(2π) 0 0.309 0.445 0.898 φsim/(2π) 0 0.308 0.445 0.899 600 D1/(10－10 m) 1.413+2.816i -0.848+3.307i -1.507+0.848i 1.370+0.654i φana/(2π) 0 0.229 0.486 0.790 φsim/(2π) 0 0.228 0.485 0.790 900 D1/(10－10 m) 0.983+0.531i 0.741+2.087i -0.946+1.872i -0.866+0.381i φana/(2π) 0 0.234 0.492 0.711 φsim/(2π) 0 0.234 0.491 0.710 1 200 D1/(10－10 m) -0.133+0.010i 0.872+0.755i 0.165+1.747i -0.830+1.177i φana/(2π) 0 0.251 0.494 0.720 φsim/(2π) 0 0.251 0.494 0.720 1 500 D1/(10－10 m) -0.669+0.482i 0.221+0.035i 0.670+0.925i -0.388+1.293i φana/(2π) 0 0.249 0.498 0.791 φsim/(2π) 0 0.249 0.499 0.792 
下载: 导出CSV
表 2 水声扩散超表面厚度和频率等参数
Table 2. Parameters such as the thickness and frequency of the underwater acoustic diffusion metasurface
下载: 导出CSV
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