发动机排气消声器传声特性的计算研究

Study on the Calculation of the Acoustical Transfer Property of Exhaust Muffler

采用有限元法对排气消声器的波动方程进行求解。采用适当的人工边界条件来描述排气口外部的半无限空间 ,通过进气口端正弦扫频激励 ,可求得出口端的响应 ,从而获得该排气消声器系统的传递函数和传声损失。

The wave equation of exhaust muffler has been solved by using finite element method with the artificial boundary conditions describing the semi-infinite space outside the outlet of muffler.The acoustical transfer function and transfer loss of exhaust muffler can be obtained by using chirp signal as excitation at the inlet of exhaust muffler.