Abstract: The research shows that the noise of exhaust system accounts for a large proportion of the vehicle noise. Therefore, reducing exhaust noise is of great significance to improve vehicle performance. To control this part of noise, one is to make technical improvement from the source, improve the working mode of the engine and replace it with other new energy sources, the orther is to install the exhaust muffler. This paper designs a perforated pipe muffler with continuous multi-gun. Through the Virtual Lab simulation software, the diameter of perforated tube, the length of muffler perforated pipe and box, and the structural parameters of its diameter on the silencing performance of muffler are studied.

Key words: Multi-cavity combined; Muffler; Finite lelment analysis; Transmission loss; Key parameters; Virtual Lab

摘要： 研究表明，在车辆噪声中，排气系统的噪声占很大比重，因此，降低排气噪声对改善 汽车性能有着重大的意义。对这部分噪声的控制，一是从源头上进行技术改进，改进发动机 的工作方式，换用其他新能源；二是安装排气消音器。文章所设计的是一种连续多腔的穿孔 管消音器，通过 Virtual Lab 声学仿真软件，研究穿孔管的直径、消音器穿孔管及腔体的长度、 腔体直径大小等结构参数对消音器消音性能的影响。

关键词: 多腔组合；消音器；有限元分析；传递损失；关键参数；Virtual Lab