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A multiscale theoretical approach for the sound absorption of slit-perforated double porosity materials

机译：狭缝双孔隙材料吸声的多尺度理论方法

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摘要

A multiscale theoretical approach is proposed to design the sound absorption of slit-perforated double porosity materials by employing the double porosity theory. The materials consist of a microporous matrix with periodically perforated narrow slits, in which the micropores of the matrix and the slits are interconnected and together form a multiscale material with double porosity. Considering the different ratios for the characteristic size of the micropores to that of the slits, two contrast cases including low permeability contrast (LPC) case and high permeability contrast (HPC) case are included in the design analysis. Numerical simulations based on COMSOL Multiphysics are conducted to verify the developed theoretical model, with good agreements being achieved. The comparison between the multiscale material and its two constituent elements manifests the superiority of the multiscale material for sound absorption. The analysis on the surface impedance and propagation constant exposes the fact that the multiscale material design improves the acoustic impedance matching between the material and air and leads to an enhancement of sound absorption. Furthermore, the effects of the multiscale parameters on the sound absorption of the double porosity materials are explored in terms of the distribution of the sound pressure and energy dissipation. This work provides a helpful guidance to improve the sound absorption of the microporous materials by employing the multiscale design approach.
机译：提出了一种利用双孔隙率理论设计狭缝双孔隙材料吸声的多尺度理论方法。该材料由具有周期性穿孔窄缝的微孔基质组成，其中基质的微孔和缝相互连接，并共同形成具有双孔隙率的多尺度材料。考虑到微孔的特征尺寸与狭缝的特征尺寸的比率不同，在设计分析中包括两种对比情况，包括低渗透性对比（LPC）情况和高渗透性对比（HPC）情况。进行了基于COMSOL Multiphysics的数值模拟，以验证所开发的理论模型，并取得了良好的一致性。多尺度材料及其两个组成元素之间的比较显示了多尺度材料在吸声方面的优越性。表面阻抗和传播常数的分析揭示了以下事实：多尺度材料设计改善了材料与空气之间的声阻抗匹配，并导致了吸声的增强。此外，从声压分布和能量耗散的角度探讨了多尺度参数对双孔隙材料吸声的影响。这项工作为采用多尺度设计方法改善微孔材料的吸声提供了有益的指导。

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  • 来源
    《Composite Structures》 |2019年第9期|110919.1-110919.12|共12页
  • 作者

    Xin Fengxian; Ma Xiaowen; Liu Xuewei; Zhang Chuanzeng;

  • 作者单位

    Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, MOE Key Lab Multifunct Mat & Struct, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, MOE Key Lab Multifunct Mat & Struct, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, MOE Key Lab Multifunct Mat & Struct, Xian 710049, Shaanxi, Peoples R China;

    Univ Sieger, Dept Civil Engn, D-57068 Siegen, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Multiscale materials; Slit-perforated; Double porosity; Sound absorption;

    机译：多尺度材料;开孔;双重孔隙;吸声;

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