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降低流动管道噪声在工程上是非常有用的。本文应用线性声学理论将无流动时旁通管道反声降噪方法推广到具有流动的情况，进行了数值计算和实验研究。数值工作包括建立相应的声学关系和管道分叉点连接条件；计算了多种噪声源传声损失频率特性，并讨论了主要参数对反声的影响。实验研究是对单段旁通管道有吸声尖劈的情况下进行的，实验时采用不同的噪声源和不同的流速，测量结果与理论计算符合良好。PACS数43．20
Reducing flow pipe noise is very useful in engineering. In this paper, the linear acoustic theory is used to extend the anti-noise method of bypass pipe without flow to the case with flow. Numerical calculations and experimental studies are carried out. The numerical work includes establishing the corresponding acoustic relationship and the connection condition of the pipe bifurcation point. The frequency characteristics of the propagation loss of various noise sources are calculated and the influence of the main parameters on the anti-noise is discussed. The experimental study is carried out on a single section of the bypass pipe with acoustic wedges, the experiment using different sources of noise and different flow rates, the measured results in good agreement with the theoretical calculations. PACS number 43.20