Low Frequency Broadband Sound Absorption Characteristics of Stepped Micro-Slit Metasurface

doi:10.7652/xjtuxb202109008

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Low Frequency Broadband Sound Absorption Characteristics of Stepped Micro-Slit Metasurface

更新时间：2025-07-09

- Low Frequency Broadband Sound Absorption Characteristics of Stepped Micro-Slit Metasurface
- Vol. 55, Issue 9, Pages: 71-79(2021)
- 作者机构：
  
  1. 西安交通大学机械工程学院,西安,710049
  2. 西安交通大学机械结构强度与振动国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202109008
  CLC： TB34;O422.4
- Online First：10 September 2021，
  
  Published：2021
- 稿件说明：
移动端阅览
Low Frequency Broadband Sound Absorption Characteristics of Stepped Micro-Slit Metasurface[J]. 2021, 55(9): 71-79.
DOI：

Low Frequency Broadband Sound Absorption Characteristics of Stepped Micro-Slit Metasurface[J]. 2021, 55(9): 71-79. DOI： 10.7652/xjtuxb202109008.

摘要

针对目前低频宽带吸声及通风吸声效果较差的问题

提出了两种嵌套型阶梯微缝超表面。设计了阶梯型微缝吸声单元

获得了较传统微缝吸声体更优的低频吸声效果; 将通风孔引入到阶梯型微缝单元中构建了通风型吸声单元

在保证吸声性能的同时拥有了新的通风效果; 提出了一种嵌套式并联方式

不仅能有效扩展吸声带宽

还能克服传统并联方式表面积随单元数量线性增加的问题

有效降低并联结构的吸声表面积; 结合阶梯型微缝单元和嵌套式并联方式

设计了两种低频宽带吸声超表面。结果表明:以16个单元嵌套形成的厚度仅为70 mm的超表面能实现600～1 600 Hz的吸声效果; 以8个单元嵌套形成的厚度为39.1 mm的超表面不仅能实现470～657 Hz的吸声效果

还能获得较好的通风性能。这两种超表面具有结构紧凑、吸声带宽大、尺寸小且兼具通风的特点

在实际中具有广泛的应用前景。

Abstract

In order to solve the problem of low frequency broadband sound absorption and ventilation

two kinds of nested stepped micro-slit metasurfaces are proposed. Firstly

a stepped micro-slit sound absorption unit is designed

which can obtain lower frequency sound absorption than traditional micro-slit absorber. Secondly

a ventilation hole is introduced into the stepped micro-slit unit to construct a ventilated unit

and it can achieve ventilation effect while ensuring the sound absorption performance in a certain frequency range. Thirdly

a nested parallel method is proposed

which can not only effectively broaden the sound absorption bandwidth

but also overcome the problem that the surface area of the traditional parallel structure increases linearly with the number of units

thus can make the nested structure has a smaller surface area. Finally

two metasurfaces

sound-absorbing type and ventilated type

are designed using the micro-slit units with the nested parallel method. The results show that the sound-absorbing type metasurface can achieve sound absorption from 600 Hz to 1 600 Hz with a thickness of only 70 mm formed by nesting 16 elements

while the ventilated type metasurface formed by nesting 8 units with a thickness of 39.1 mm can achieve sound absorption from 470 to 657 Hz and possess ventilation performance. These two kinds of micro-slit sound absorption metasurfaces can achieve low frequency broadband sound absorption with small size

and have promising applications in engineering practice.

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references

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