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Thermal effect on the acoustic behavior of an axisymmetric lined duct

机译：热效应对轴对称衬里管道声学性能的影响

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摘要

This paper deals with the effect of the temperature and the frequency on the acoustic behavior of lined duct partially treated with usual material used in acoustic insulation. First, the effect of frequencies and temperature on the acoustic impedance of usual materials used in lined duct such as glass or rock wools in order to reduce acoustic level is investigated. Secondly, the variational formulation of the acoustic duct problem taking into account velocity and temperature effects is established. Then, a numerical model is derived which permits to compute the reflection and the transmission coefficients of such duct for different temperatures and several flow velocities. The acoustic power attenuation is then computed from these coefficients and the effect of the temperature and flow velocities on this energetic quantity is evaluated. The numerical results are obtained for three configurations of a lined duct treated for different temperature ranges and several velocities. Numerical coefficients of transmission and reflection as well as the acoustic power attenuation show the relative influence of temperature.
机译：本文研究了温度和频率对衬里风管的声学性能的影响，衬里风管经过部分隔音处理后用常规材料进行了部分处理。首先，研究了频率和温度对衬里管道中常用材料（例如玻璃或岩棉）的声阻抗的影响，以降低声级。其次，建立了考虑速度和温度影响的声导管问题的变分形式。然后，导出一个数值模型，该数值模型可以计算这种导管在不同温度和几种流速下的反射系数和透射系数。然后根据这些系数计算出声功率衰减，并评估温度和流速对该高能量的影响。对于在不同温度范围和几种速度下处理的衬里管道的三种配置，可以获得数值结果。透射和反射的数值系数以及声功率衰减显示了温度的相对影响。

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  • 来源
    《Applied Acoustics》 |2014年第12期|138-145|共8页
  • 作者

    Mounir Ben Jdidia; Ali Akrout; Mohamed Taktak; Lotfi Hammami; Mohamed Haddar;

  • 作者单位

    Mechanics, Modelling and Production Laboratory, National School of Engineers of Sfax, University of sfax, Sfax, Tunisia;

    Mechanics, Modelling and Production Laboratory, National School of Engineers of Sfax, University of sfax, Sfax, Tunisia;

    Mechanics, Modelling and Production Laboratory, National School of Engineers of Sfax, University of sfax, Sfax, Tunisia;

    Mechanics, Modelling and Production Laboratory, National School of Engineers of Sfax, University of sfax, Sfax, Tunisia;

    Mechanics, Modelling and Production Laboratory, National School of Engineers of Sfax, University of sfax, Sfax, Tunisia;

  • 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

    Lined duct; Acoustic impedance; Temperature effect; Transmission; Reflection; Acoustic attenuation;

    机译：衬管;声阻抗;温度影响;传播;反射;声衰减;

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