内燃机排气消声系统声学特性的数值预测

Numerical Prediction of Acoustical Characteristics of Internal Combustion Engine Exhaust Muffler System

提出了一种有效预测内燃机排气消声系统声学特性的新方法。此方法使用传递矩阵法和边界元法计算整个排气消声系统的四极参数，使用双负载法和特征线法确定发动机的声源阻抗和强度，实现内燃机排气噪声和消声器插入损失预测。文中对一台柴油机排气消声系统进行了研究，其预测结果与实测结果吻合良好。

A new method for effectively predicting acoustic characteristics engine exhaust muffler system has been presented. Four -pole parameters of whole exhaust muffler system have been calculated by transfer matrix method and the boundary element method and the noise souxce impedance and strength of engine have been determined by the two load method and chateristic line method, so as to realize the .prediction of exhaust noise and insertion loss of muffler. An exhaust muffler system of a diesel engine has been used for study and its predicted results aue in good agreement with the measured ones.