CAJ | 학술논문

传递损失是评价消声器声学性能的一个重要指标。提出了一种方法-管道声模态法代替传统方法估算传递损失。对进出口截面积较小的消声器进行计算和检验，与传统方法比较，结果基本吻合，且过程简单，提高传递损失的计算效率。对进出口截面积较大的消声器，中高频段由于大量高次波的出现，传统方法失效；但低频段管中声波以平面波为主，其结果与传统法一致。因此可以采用管道声模态法快速估算传递损失。
전체손실시평개소성기성학성능적일개중요지표。제출료일충방법-관도성모태법대체전통방법고산전체손실。대진출구절면적교소적소성기진행계산화검험，여전통방법비교，결과기본문합，차과정간단，제고전체손실적계산효솔。대진출구절면적교대적소성기，중고빈단유우대량고차파적출현，전통방법실효；단저빈단관중성파이평면파위주，기결과여전통법일치。인차가이채용관도성모태법쾌속고산전체손실。
Transmission loss is an important index in evaluating muffler’s acoustic performance. A new method called acoustic mode of pipeline was proposed in this paper to estimate the transmission loss. This method was applied to the transmission-loss estimation in the muffler with narrow inlet and outlet. The result checks well with that of the traditional method, and the process is very simple. For the muffler with larger sectional areas of the inlet and outlet, the traditional method fails since large amount of high-order secondary wave appears in the medium-high frequency range. But in the low frequency range the result is consistent with that of the traditional method since the plane wave becomes the main acoustic wave in the pipeline. In this case, the method of acoustic mode in pipeline can estimate the transmission loss effectively.