Conventional sound shielding structures is difficult to meet the requirements of low-to-middle frequency broadband sound insulation and free ventilation. In this paper, we propose a ventilated metamaterial silencer based on Fano-like interference, which can achieve the sound transmission loss (STL) of more than 10 dB in the range of 516–970 Hz with subwavelength thickness (0.11 λ) while remains an opening area ratio of 23%. The designed silencer is composed of a large central orifice and four surrounding coiling channels, making the sound waves passing through the two areas generate Fano-like asymmetric transmission spectrum and form efficient reflection to insulate sound coming from various directions. The parametric studies are also carried out to investigate the tunable acoustic performance. Experiment measurement matches well with the simulation results. In the future, the proposed silencer may have potential applications in practical environments requiring broadband sound insulation and free air flows.

中文翻译：

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基于Fano样干涉的高反射宽带通风超材料消音器

常规的隔声结构难以满足中低频宽带隔声和自由通风的要求。在本文中，我们提出了一种基于 Fano 类干扰的通风超材料消音器，在亚波长厚度（0.11λ)，同时保持 23% 的开口面积率。设计的消音器由一个大的中心孔口和四个环绕的盘绕通道组成，使穿过这两个区域的声波产生类似Fano的非对称透射谱，并形成有效的反射，以隔离来自各个方向的声音。还进行了参数研究以研究可调谐声学性能。实验测量与仿真结果吻合良好。未来，所提出的消音器可能在需要宽带隔音和自由气流的实际环境中具有潜在的应用。