A low-frequency sound insulation metastructure with relatively high ventilation

IF 1.8 4区物理与天体物理 Q3 PHYSICS, APPLIED

Modern Physics Letters B Pub Date : 2023-11-28 DOI:10.1142/s0217984924501392

Ni Zhen, Lei Shi, Yingjie Zhu

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Abstract

Noise pollution is growing nowadays and there is always a conflict between ventilation and noise insulation. The advances in acoustic metamaterials provide an effective solution for this conflict. In this paper, we propose a metastructure with protruded necks based on Helmholtz resonance. Sound transmission loss (STL) of 13 dB at low-frequency of 488[Formula: see text]Hz is obtained in experiment with the ventilation of 20%, which is in good agreement with the simulation. It is revealed that introduction of protruded neck can reduce the resonant frequency. Sound absorption is the main mechanism for noise insulation at low frequency. Next, the effects of geometric parameters on sound insulation are discussed. A reduction in cross-sectional area of neck, an increase in neck length, and an increase in ventilation all lead to a decrease in both resonant frequencies and STL amplitudes. Finally, a two-layer structure is constructed by the proposed metastructure with different neck length in each unit. Both the amplitude and frequency range of STL are enlarged. These results exhibit a practical application for ventilated metastructure in sound insulation at low frequency.

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具有相对较高通风量的低频隔音结构

如今，噪声污染日益严重，通风和隔音之间总是存在矛盾。声学超材料的发展为这一矛盾提供了有效的解决方案。在本文中，我们提出了一种基于亥姆霍兹共振的带突出颈部的超材料结构。在通风量为 20% 的情况下，实验得到低频 488[计算公式：见正文]赫兹的声音传输损失（STL）为 13 dB，与模拟结果十分吻合。实验结果表明，突出颈部可以降低共振频率。吸音是低频隔音的主要机制。接下来，我们讨论了几何参数对隔音的影响。颈部横截面积的减小、颈部长度的增加和通风量的增加都会导致共振频率和 STL 振幅的降低。最后，利用所提出的元结构构建了双层结构，每个单元的颈部长度各不相同。STL 的振幅和频率范围都扩大了。这些结果表明，通风元结构在低频隔音方面具有实际应用价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Modern Physics Letters B 物理-物理：凝聚态物理

CiteScore

3.70

自引率

10.50%

发文量

235

审稿时长

5.9 months

期刊介绍： MPLB opens a channel for the fast circulation of important and useful research findings in Condensed Matter Physics, Statistical Physics, as well as Atomic, Molecular and Optical Physics. A strong emphasis is placed on topics of current interest, such as cold atoms and molecules, new topological materials and phases, and novel low-dimensional materials. The journal also contains a Brief Reviews section with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.