中文摘要：

提出了一种利用声波反相抵消降低柴油机排气噪声的主要成分、利用气流反相对冲降低气流速度从而降低气流再生噪声的新型消声方法。以CG25型单缸柴油机为样机,对新型原理消声器的声学特性进行了模拟和试验分析。研究结果表明：反相对冲新型排气消声器在110Hz左右和300~500Hz的低频段消声效果显著,且在柴油机的标定转速下（2200r/min）,反相对冲排气消声器的插入损失近乎原装消声器的两倍。

英文摘要：

A new noise control method was proposed to reduce the dominant components of exhaust noise by using out-of-phase acoustic cancellation and to reduce the regeneration noise from diesel muffler by using split-stream rushing.To this end,a single-cylinder diesel engine CG25 was chosen for the simulation and experimental analysis of the acoustic characteristics for a new muffler.The results show that the noise reduction of the new out-of-phase and split-stream-rushing muffler is noticeable around the frequency as low as 110 Hz and between 300～500Hz.In addition,the insertion loss of the new muffler is almost twice as that of the original muffler at the rated speed of 2200r/min,this proves the correctness of the new noise reduction method and the simulation analysis.