基于传递矩阵方法的排气消声器计算机辅助设计

为实现消声器选型的程序化,在建立消声系统数学模型的基础上,通过对常见的抗性排气消声器的结构分析,将基本的消声元件分为7种,在考虑均匀流和线性温度梯度的前提下,推导了它们的传递矩阵;并且在此基础上建立消声系统消声量预测模型和压力损失计算模型.利用VC 和Matlab联合编制了排气消声器性能预测的通用CAD软件,将软件的计算结果与试验结果进行比较,吻合较好.该软件具有一定的实用价值及应用前景.

Computer Assisted Design of Exhaust Muffler Based on Transfer Matrix

A mathematical model is set up for the exhaust system where transfer matrises for seven kinds of silencing elements are considered, aimed at the even flow and linear temperature gradient by analyzing the structure of the exhaust muffler. On this basis the performance forecasting model is developed by the transfer matrix method. According to the model, a CAD system to the silencer is designed through VC and Matlab jointly. It has two functions, i.e. that of acoustic performance forecasting and of aerodynamic performance forecasting. Experiments showed fine agreement between test and calculation results. The software appears to be useful for the design and further study on mufflers.