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Sound Propagation in a Duct with Wall Corrugations Having Square-Wave Profiles

机译:具有方波形壁波纹的管道中的声音传播

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摘要

Acoustic wave propagation in ducts with rigid walls having square-wave wall corrugations is considered in the context of a perturbation formulation. Using the ratio of wall corrugation amplitude to the mean duct half width, a small parameter is defined and a two levels of approximations are obtained. The first-order solution produces an analytical description of the pressure field inside the duct. The second-order solution yields an analytical estimate of the phase speed of waves transmitting through the duct. The effect of wall corrugation density on acoustic impedance and wave speeds is highlighted. The analysis reveals that waves propagating in a duct with square-wave wall corrugation are slower than waves propagating in a duct with sinusoidal wave corrugation having the same corrugation wavelength.
机译:在扰动公式中考虑了在具有方波壁波纹的刚性壁的管道中的声波传播。使用壁波纹振幅与平均导管半宽度的比值,可以定义一个小的参数,并获得两个近似值。一阶解产生了对管道内部压力场的分析描述。二次解可得出通过管道传输的波的相速度的解析估计。突出了壁波纹密度对声阻抗和波速的影响。分析表明,在方波壁波纹管中传播的波比在具有相同波纹波长的正弦波波纹管中传播的波要慢。

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  • 来源
    《Mathematical Problems in Engineering》 |2015年第12期|516982.1-516982.8|共8页
  • 作者

    Hawwa Muhammad A.;

  • 作者单位

    King Fahd Univ Petr & Minerals, Dept Mech Engn, Dhahran 31261, Saudi Arabia.;

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  • 正文语种 eng
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