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首页> 外文会议>AIAA/CEAS aeroacoustics conference >Investigation of impedance eduction accuracy on 'interferometer with the flow' test rigs with help of exact solution problem of sound propagation in duct with impedance transition
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Investigation of impedance eduction accuracy on 'interferometer with the flow' test rigs with help of exact solution problem of sound propagation in duct with impedance transition

机译：借助“阻抗干扰过渡”管道中的声音传播的精确解决问题，研究“带流量干涉仪”测试设备上的阻抗发射精度

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The present paper is dedicated to theoretical and experimental investigation of the problem of impedance eduction accuracy on "interferometer with the flow" test rig. The following widespread impedance eduction methods are under consideration: 3-microphone straightforward Prony techniques, method of two sources and multi-microphone techniques, based on the numerical solution of sound propagation in ducts. Exact solution of the impedance transition in a rectangular duct with flow is used for verification of cases under consideration. As a result, it is found that the relative error of, approximate methods for determining the amplitudes of the reflected and transmitted modes at impedance discontinuity can be significant in some cases. It is shown theoretically and experimentally that the case corresponded with anti-resonance is the most disagreeable case, at which the accuracy of impedance eduction is small for all methods based on measuring longitude wave characteristics only.
机译：本文致力于“带流量干涉仪”试验台上阻抗发射精度问题的理论和实验研究。正在考虑以下广泛的阻抗减小方法：基于导管中声音传播的数值解决方案的3麦克风直接Prony技术，两种声源方法和多麦克风技术。矩形管道中带流动的阻抗跃迁的精确解可用于验证所考虑的情况。结果，发现在某些情况下，用于确定在阻抗不连续处的反射模式和透射模式的幅度的近似方法的相对误差可能很大。从理论上和实验上表明，与反谐振相对应的情况是最不适合的情况，在这种情况下，仅基于测量经度波特性的所有方法的阻抗导出精度都很小。

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