Low-Frequency Broadband Absorption Mechanism of Micro-Perforated Lossy Metasurface

doi:10.7652/xjtuxb201912011

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Low-Frequency Broadband Absorption Mechanism of Micro-Perforated Lossy Metasurface

更新时间：2025-07-09

- Low-Frequency Broadband Absorption Mechanism of Micro-Perforated Lossy Metasurface
- Vol. 53, Issue 12, Pages: 80-86(2019)
- 作者机构：
  
  西安交通大学机械工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201912011
  CLC： O424;TB34
- Online First：10 December 2019，
  
  Published：2019
- 稿件说明：
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Low-Frequency Broadband Absorption Mechanism of Micro-Perforated Lossy Metasurface[J]. 2019, 53(12): 80-86.
DOI：

Low-Frequency Broadband Absorption Mechanism of Micro-Perforated Lossy Metasurface[J]. 2019, 53(12): 80-86. DOI： 10.7652/xjtuxb201912011.

摘要

针对传统材料难以有效吸收低频噪声且带宽较窄的问题

提出了一种微穿孔黏性超表面的低频宽带吸声机理

并设计了多元胞超表面结构

其中每个元胞由微穿孔板和折叠背腔组成。首先利用有限元仿真和理论公式计算单个元胞的吸声性能

并与传统亥姆霍兹共振器结构进行对比

发现该结构具有优异的高阶峰值

而且峰值带宽增加约1倍

基于此提出了实现低频和宽带的机理; 然后分析了典型结构参数对吸声特性的影响规律

如吸声面积比、小孔直径及背腔深度等; 最终通过多单元峰值间严格耦合

设计了由8个元胞组成的宽带吸声超表面。结果表明:吸声超表面厚度仅为6 cm

在频段550～2 500 Hz范围内实现连续优异的吸声带宽

平均吸声系数高达90%以上。该结构具有厚度薄、频带宽且强度好等特点

在消声室、工厂和航空等场合具有广泛的应用前景。

Abstract

Aiming at poor efficiency of the traditional materials in absorption of low-frequency sound and its narrow bandwidth

a low-frequency broadband absorption mechanism of the micro-perforated lossy metasurface is presented

and a multi-cell metasurface is designed

in which each cell is comprised of a micro-perforated panel and a coiled-up cavity. The absorption coefficient of a single cell is firstly calculated by finite element simulation and theoretical formulas. Compared with the traditional Helmholt--resonator structures

the present metasurface structure can gain multiple excellent higher-order peaks besides the first peak

and each peak bandwidth is nearly doubled. Hence the mechanism is proposed to achieve low-frequency and wide-band absorption. The specific effects of the typical parameters on the absorption performance are then investigated

including absorption area ratio

hole diameter

cavity depth

and so on. By strictly coupling the peaks of the cells

an 8-cell metasurface

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Keywords

references

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