A method for modeling perforated tube muffler components. II. Applications
A method for modeling perforated tube muffler components. II. Applications
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DOI：
10.1121/1.383680
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发表时间：
1979-09
影响因子：
2.4
通讯作者：
J. W. Sullivan
中科院分区：
文献类型：
--
作者：
J. W. Sullivan
本文是两篇论文中的第二篇，描述了一种用于建模具有穿孔流管的消声器部件的方法，例如在汽车应用中经常发现的那些。在第一篇论文中的理论模型的开发，而在这里的理论是应用到具体的示范模型的效用和潜力。这些应用是理想化的，因为在穿孔管消声器中同时发生的效应被单独处理。这些影响是（1）由于有限振幅声压引起的穿孔的非线性阻抗，以及（2）穿孔的阻抗随平均流的变化。第一种效果是用直通谐振器来证明的，第二种效果是用横流腔来证明的。在这两种情况下传输损耗的预测结果与测量结果进行了比较。成功的建模的关键是一个适当的描述的电阻抗。结果所灌输的信心促使了对国家安全的调查。
This paper is the second of two papers describing a method for modeling muffler components having perforated flow tubes, as for example those found frequently in automotive applications. In the first paper the theoretical model was developed, whereas here the theory is applied to demostrate specifically the utility and potential of the model. The applications are idealized in the sense that effects which occur simultaneously in perforated‐tube mufflers are treated separately. These effects are (1) the nonlinear impedance of the perforation due to finite amplitude sound pressure, and (2) the change in impedance of the perforation with mean flow. The first effect is demonstrated with a straight through resonator, and the second with a cross‐flow chamber. Predicted results for transmission loss in both cases compared quite well with measurements. Crucial to the success of the modeling was a proper description of the perforate impedance. The confidence instilled by the results prompted an inquiry into the nat...