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Acoustic characterization of ducts lined with poroelastic materials based on wave finite element method

机译：基于波有限元法的多孔弹性材料衬里管道的声学表征

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摘要

A wave finite element (FE) approach is presented for investigating acoustic characteristics of an axisymmetric duct lined with poroelastic materials. A short segment of the poroelastic lined duct is modelled using commercial FE software package, and an eigenvalue problem is established by applying periodic conditions, which greatly reduces the complexity associated with the formulation of eigenvalue problem especially when the intricate two-phase interaction within the poroelastic material is of significance. The predicted wavenumbers agree with those by forced response simulation with full FE simulations. The acoustic characteristics of poroelastic lined duct is analyzed based on the numerical model, which is verified by a full FE model, with emphasis on the effect of skeleton elasticity. For the structure-borne modes, a strong coupling between the fluid phase and solid phase is observed; while for the fluid-borne modes, such coupling is found to be negligible. For a poroelastic lined duct silencer, it is found that the structure borne mode accounts for the spectral peaks in transmission loss spectrum through enhanced absorption and reflection effects. Meanwhile, the boundary condition of poroelastic material has significant effect on the structure-borne mode. In the simulated case, the change of boundary condition from fixed to rolling causes the first structure-borne mode to change from an evanescent higher-order-like mode to a propagating plane-wave-like mode in low frequency range, which affects the acoustic characteristics of the poroelastic lined silencers noticeably. (C) 2018 Elsevier Ltd. All rights reserved.
机译：提出了一种波有限元（FE）方法，以研究衬有多孔弹性材料的轴对称导管的声学特性。使用商业有限元软件对一小段多孔弹性衬里管道进行建模，并通过应用周期性条件来建立特征值问题，这极大地降低了与特征值问题的公式化相关的复杂性，尤其是当多孔弹性体内复杂的两相相互作用时材料很重要。预测的波数与带有完整有限元模拟的强制响应模拟的波数一致。基于数值模型分析了多孔弹性衬里管道的声学特性，并通过完整的有限元模型进行了验证，重点是骨架弹性的影响。对于固相模式，观察到液相和固相之间的强耦合；对于流体传播模式，这种耦合被认为是微不足道的。对于多孔衬里的管道消声器，发现结构传播模式通过增强的吸收和反射效应来解释传输损耗谱中的谱峰。同时，多孔弹性材料的边界条件对结构传递模式有重要影响。在模拟情况下，边界条件从固定变为滚动，导致第一结构传播模式在低频范围内从from逝的高阶模态转变为传播的平面波模态，从而影响声学多孔弹性衬里消音器的特性明显。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Applied Acoustics》 |2019年第2期|362-373|共12页
  • 作者

    Jiang Changyong; Wang Chunqi; Huang Lixi;

  • 作者单位

    Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China|Univ Hong Kong, Lab Aerodynam & Acoust, Zhejiang Inst Res & Innovat, Hong Kong, Peoples R China;

    Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China|Univ Hong Kong, Lab Aerodynam & Acoust, Zhejiang Inst Res & Innovat, Hong Kong, Peoples R China;

    Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China|Univ Hong Kong, Lab Aerodynam & Acoust, Zhejiang Inst Res & Innovat, Hong Kong, Peoples R China;

  • 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

    Poroelastic material; Duct silencer; Modal analyses; Wave finite element; Mode matching method;

    机译：多孔弹性材料;管道消声器;模态分析;波浪有限元;模式匹配法;

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