Abstract: Since onedimensional and twodimensional commercial codes may not be used to accurately analyze the acoustical performance for resistance mufflers in the case of different arrangement of crosssections, threedimensional software is employed to analyze this problem. It is found that different arrangements of crosssections can induce different transmission loss in a large frequency range. According to the exhaust noise spectrum and the computation results, the design of the mufflers can be optimized further.

Key words: acoustics, transmission loss, finite element, arrangement of crosssections, muffler

摘要： 用三维声学软件来分析不同截面布置对消声器声学性能的影响，发现：(1)当截面布置只改变排列位置或者位置变动比较小时，虽然大体趋势一样，但是部分频段变化较大。(2)当截面布置不同时，消声器的传递损失在比较大的频率范围内有明显区别。根据计算结果，按照具体排气噪声频谱，就可以在一定程度上对消声器进行进一步的优化设计。

关键词: 声学, 传递损失, 有限元, 截面布置, 消声器