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Prediction of the spatial characteristics of higher mode sound transmission through a periodic slit screen

机译：通过周期性缝隙屏幕的高模声音传输的空间特性预测

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摘要

Periodic slit screens are often installed in rectangular apertures either to mask the opening or to reduce transmitted noise. This investigation considers the higher-order scattered and transmitted sound from a point source through a periodic screen mounted in a rigid baffle. In particular, this paper considers the spatial characteristics, or directivity, of the scattered field for a particular higher order mode. Uncoupled higher-order mode analysis is used to estimate the scattered and transmitted sound fields for the selected mode of the aperture without the presence of the screen. Transmission coefficients for the screens are then calculated using the well established equivalent mass layer effect and applied to the calculated higher-order mode scattered and transmitted sound pressures. Using an anechoic chamber, measurements were made over a small arc of the scattered sound field through a range of screens of different aspect ratios but the same porosity. The screens consisted of equally spaced open slits and solid laths and the number of slits was reduced to change the aspect ratio. In each case the point source was positioned on the impinging side of the aperture so as to drive one particular scattered higher-order aperture mode at or near cut-on. Comparison of the measured and predicted sound pressures indicate that good estimates of the sound field can be obtained through the approach of applying simple corrections for the presence of the screens to the estimates for the open aperture established using uncoupled calculations for the higher-order modes. It is also shown that the results for a specific mode excited at one particular frequency are applicable at other excitation frequencies provided that the correct non-dimensionalisation is applied.
机译：定期的缝隙滤网通常安装在矩形孔中，以掩盖开口或减少传输的噪声。这项研究考虑了通过安装在刚性挡板中的周期性屏幕从点声源发出的高阶散射声和传播声。特别是，本文考虑了特定高阶模式的散射场的空间特性或方向性。未耦合的高阶模式分析用于估计没有屏幕的情况下所选光圈模式的散射声场和透射声场。然后，使用已建立的等效质量层效应来计算屏幕的透射系数，并将其应用于计算出的高阶模态散射声压和透射声压。使用消声室，通过一系列纵横比不同但孔隙率相同的屏幕，在散射声场的一小段弧线上进行测量。筛网由等间距的开口缝和实心板条组成，减少了缝的数量以改变纵横比。在每种情况下，点源都位于光阑的入射侧，以便在切近或切近时驱动一种特定的散射高阶光阑模式。测得的声压和预测的声压的比较表明，可以通过对屏幕的存在进行简单的校正，对使用高阶模式的未耦合计算建立的开孔的估计值进行简单校正，从而获得良好的声场估计值。还显示出，只要应用正确的无量纲化，以一个特定频率激发的特定模式的结果就可以应用于其他激发频率。

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  • 来源
    《Applied Acoustics》 |2014年第9期|47-56|共10页
  • 作者

    J.L. Horner; S.J. Walsh;

  • 作者单位

    Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough LE11 3TU, United Kingdom;

    Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough LE11 3TU, United Kingdom;

  • 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

    Aperture; Higher-mode; Slit screen; Sound transmission;

    机译：光圈;更高模式分屏;声音传输;

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