Abstract

The authors have carried out a systematic study of the accuracy in the impedance eduction of liners in “interferometer with flow” rigs in the absence of grazing flow. A method is proposed for determining the confidence interval of sound pressure measurements for such a rig. The analytical model of sound propagation in a rectangular duct in the presence of impedance transitions, previously proposed by the authors and described with the Wiener–Hopf method, is experimentally confirmed. A method is developed and implemented for impedance eduction of liners in the absence of flow, based on an analytical method that takes into account the passage of sound modes through the impedance transition.

中文翻译：

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阻抗过渡存在下矩形管道内声传播解析模型的实验验证及基于该方法的阻抗推导方法的发展

摘要

作者已经对“无流量干涉仪”装置中衬管阻抗减小的准确性进行了系统的研究。提出了一种用于确定这种钻机的声压测量的置信区间的方法。实验上证实了作者先前提出并用Wiener-Hopf方法描述的存在阻抗跃迁的矩形管道中声音传播的解析模型。基于一种分析方法，开发和实现了一种在不存在流动的情况下用于衬管阻抗减小的方法，该方法考虑了声模通过阻抗过渡的过程。