基于微缝折叠空间结构的宽带吸声超材料设计

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (3) : 171-178.

论文

陈应航1,2,3，徐驰1,3，黄唯纯2，解龙翔2，张建翔1,3，汪双君1,3，孙薇薇1,3

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Design of broadband sound-absorbing metamaterial based on micro-slit folded space structure

CHEN Yinghang1,2,3, XU Chi1,3, HUANG Weichun2, XIE Longxiang2, ZHANG Jianxiang1,3,WANG Shuangjun1,3, SUN Weiwei1,3

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文章历史 +

摘要

如何实现低频宽带吸声，设计具有亚波长厚度的吸声超材料一直是一项具有挑战性的任务。提出了一种微缝折叠空间超材料结构，建立结构的理论解析模型与数值仿真模型，深入研究其声学特性和吸声机理，分析了典型结构参数对吸声特性的影响规律，基于此探究实现低频宽带吸声的可能性。研究表明，通过调整折叠空间厚度及折叠通道数目，可以在较大的频带范围内调节结构的峰值频率，同时不改变其近完美的吸声性能。最后，提出了一种宽带吸声超材料，在500Hz ~ 2000Hz频率范围内获得平均吸声系数达0.931的连续高效吸声带宽。结构厚度为5.68cm，仅为最低共振频率对应波长的1/12，实验结果良好。研究成果可为实现宽带吸声提供借鉴。

Abstract

How to achieve low-frequency broadband sound absorption and design sound-absorbing metamaterials with sub-wavelength thickness has always been a challenging task. A micro-slit folded space metamaterial structure was proposed. The theoretical analytical model and numerical simulation model of the structure were established. The acoustic characteristics and sound absorption mechanism were deeply studied. The influence of typical structural parameters on sound absorption characteristics was analyzed. Based on these, the possibility of realizing low-frequency broadband sound absorption was explored. The results show that by adjusting the thickness of the folded space and the number of folded channels, the peak frequency of the structure can be adjusted in a large frequency band without changing its near-perfect sound absorption performance. Finally, a broadband sound absorption metamaterial was proposed to obtain a continuous and efficient sound absorption bandwidth with an average sound absorption coefficient of 0.931 in the frequency range of 500 Hz ~ 2000 Hz. The thickness of the structure was 5.68 cm, which was only 1/12 of the wavelength corresponding to the lowest resonance frequency. The experimental results were good. The research results can provide reference for realizing broadband sound absorption.

导出引用

陈应航1,2,3，徐驰1,3，黄唯纯2，解龙翔2，张建翔1,3，汪双君1,3，孙薇薇1,3. 基于微缝折叠空间结构的宽带吸声超材料设计[J]. 振动与冲击, 2024, 43(3): 171-178

CHEN Yinghang1,2,3, XU Chi1,3, HUANG Weichun2, XIE Longxiang2, ZHANG Jianxiang1,3,WANG Shuangjun1,3, SUN Weiwei1,3. Design of broadband sound-absorbing metamaterial based on micro-slit folded space structure[J]. Journal of Vibration and Shock, 2024, 43(3): 171-178

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