穿孔管式消声器建模与仿真分析

Modeling and Simulation Analysis of Perforated Tube Muffler

摘要: 论文基于流体网络分析方法，建立了穿孔管式消声器各组成部分的等效模型和集中参数传递矩阵，采用传递损失计算法仿真分析了消声器的噪声衰减特性：在发动机运转基频处，传递损失达到20 dB，对气体噪声衰减达到最佳；在发动机运转一次谐波和二次谐波处，消声器对噪声衰减也有一定效果。通过改变消声器的结构参数，能获得不同的噪声衰减效果。因此，消声器的结构设计要综合考虑各参数的影响，通过最优参数组合，就能获得消声器最小结构参数条件下的最佳噪声衰减效果。

Abstract: Based on the fluid network analysis method, the equivalent model and lumped parameter transfer matrix of each component of the perforated pipe muffler are established. The noise attenuation characteristics of the muffler are simulated and analyzed by using the transfer loss calculation method: at the fundamental frequency of engine operation, the transfer loss reaches 20 dB, and the gas noise attenuation effect is the best; At the first and second harmonics of engine running, the muffler also has a certain effect on noise attenuation. By changing the structural parameters of the muffler, different noise attenuation effects can be obtained. Therefore, the structure design of muffler should consider the influence of various parameters comprehensively. Through the optimal parameter combination, the optimal noise attenuation effect can be obtained under the condition of minimum structure parameters of muffler.