受声波黑洞启发的通风隔音超材料

Farid Bikmukhametov, Lana Glazko, Yaroslav Muravev, Dmitrii Pozdeev, Evgeni Vasiliev, Sergey Krasikov, Mariia Krasikova
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引用次数: 0

摘要

声学黑洞代表了一类特殊的代谢结构,它可以根据慢声原理实现高效吸收。波速的降低与声阻抗的空间变化有关,而吸收特性则与结构的局部共振引起的热粘损失有关。声波黑洞领域的大多数研究都是针对一维结构的,而目前的研究则是针对二维结构的。研究表明,维度的改变会导致噪声绝缘机制的改变,这种机制依赖于带隙的打开,而不是热粘损耗。带隙的形成与构成所考虑结构的谐振器之间的强耦合有关。数值和实验结果表明,该结构在传输频谱上具有宽频带的特点,同时仍允许气流传播。特别是,考虑了一个现实的应用场景,其中声学噪声和气流是由嵌入通风管道的风扇产生的。所获得的结果为开发用于高效噪声控制的下一代通风超材料铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ventilated noise-insulating metamaterials inspired by sonic black holes
Acoustic black holes represent a special class of metastructures allowing efficient absorption based on the slow sound principle. The decrease of the wave speed is associated with the spatial variation of acoustic impedance, while the absorption properties are linked to thermoviscous losses induced by the local resonances of the structure. While most of the developments in the field of sonic black holes are dedicated to one-dimensional structures, the current study is concerned with their two-dimensional counterparts. It is shown that the change of the dimensionality results in the change of noise insulation mechanism, which relies on the opening of band-gaps rather then thermoviscous losses. The formation of band-gaps is associated with the strong coupling between the resonators constituting the considered structures. Numerically and experimentally it is shown than the structure is characterized by broad stop-bands in transmission spectra, while the air flow propagation is still allowed. In particular, a realistic application scenario is considered, in which the acoustic noise and the air flow are generated by a fan embedded into a ventilation duct. The obtained results pave the way towards the development of next-level ventilated metamaterials for efficient noise control.
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