Abstract:

The transmission loss is one of the important characteristics to appraises the muffler performance. But in the experiment, it should been pay attention to the acoustic source stability and sound wave reflection questions.In this article summarized some differences which the insertion loses and transmits loses, Simultaneously pointed out the merits of application transmission loss test noise elimination performance，And for avoided the sound reflection proposed one new transmission loss test way. Discussed the transmission loss value change situation when the muffler be inputed different intensity sound pressure, which through the massive experiments.

Key words: acoustics, muffler, transmission loss, sound reflection, noise

摘要：

传递损失试验是评价车用消声器消声性能的一种重要方法，但在试验中应注意声源的稳定性、声波的反射等问题。总结插入损失和传递损失的一些区别，指出应用传递损失测试消声性能的优点，结合大量的试验研究结果和经验，提出了在消声器传递损失测试中避免声波反射的一种新的测试方法，并着重讨论了消声器入口不同声学边界情况下传递损失的变化情况。

关键词: 声学, 消声器, 传递损失, 声波反射, 噪声