A Review of Current Techniques for Measuring Muffler Transmission Loss
A Review of Current Techniques for Measuring Muffler Transmission Loss
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DOI：
10.4271/2003-01-1653
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发表时间：
2003-05
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影响因子：
--
通讯作者：
Z. Tao;A. Seybert
中科院分区：
文献类型：
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作者：
Z. Tao;A. Seybert
测量消声器传递损失的最常用方法是通过分解理论确定入射功率，并通过假设消声终止的平面波近似确定传递功率。不幸的是，很难构造完全消声的终端。因此，两种替代的测量方法被认为是，这不需要一个消声终止：两个负载的方法和两个源的方法。这两种方法在两种类型的消声器上进行了演示：（1）简单的膨胀室和（2）带有内部连接管的双膨胀室。对于这两种情况下，测得的传输损耗进行了比较，从边界元法获得的。两种情况下测得的传输损耗比较良好，表明传输损耗可以在没有消声终端的情况下可靠地确定。应该注意的是，双负载法更容易用于测量传输损耗。而双声源法既可测量消声器的传递损失，又可测量消声器的四极参数。
The most common approach for measuring the transmission loss of a muffler is to determine the incident power by decomposition theory and the transmitted power by the plane wave approximation assuming an anechoic termination. Unfortunately, it is difficult to construct a fully anechoic termination. Thus, two alternative measurement approaches are considered, which do not require an anechoic termination: the two load method and the two-source method. Both methods are demonstrated on two muffler types: (1) a simple expansion chamber and (2) a double expansion chamber with an internal connecting tube. For both cases, the measured transmission losses were compared to those obtained from the boundary element method. The measured transmission losses compared well for both cases demonstrating that transmission losses can be determined reliably without an anechoic termination. It should be noted that the two-load method is the easier to employ for measuring transmission loss. However, the two-source method can be used to measure both transmission loss and the four-pole parameters of a muffler.