控制排气噪声最有效的方法就是加装排气消声器，实际情况往往是降噪效果不很理想，分析原因主要是消声器结构设计不甚合理以及加工工艺存在问题，后一个问题可以通过提高工艺水平加以改善；前一个问题设计消声器的设计思路，通常消声器设计主要凭经验，一些设计计算程序是在一些理想假设条件下进行的。
The most effective way to control exhaust noise is to install a muffler.But noise reduction effect is not well. The main reasons are the unreasonable structure and the problematic processing technology. The technology problem can be improved by improving the process.For the design idea of the muffler,mainly based on experience, and some design calculation are under ideal assumptions.
而在这些假设中实际影响最大的是忽略气流再生噪声，其次是这种气流会冲击消声器的管路、壳体、隔板等声学原件，进而激发震动辐射噪声，当消声器结构参数选择不当，或结构不合理，或加工工艺存在问题时，都会导致消声器性能的下降，同时气流速度过高也会加大消声器的压力损失也会造成消声性能下降。
Among these assumptions, the biggest impact is the ignoring of air flow regeneration noise,this air will impact the muffler’s pipes, shells, partitions and other components, and then stimulate vibration radiation noise. when the muffler structure parameters are not properly, or the structure is unreasonable, or there are problems in the processing technology, it will cause the performance of the muffler to decrease. At the same time, too high air velocity will increase the pressure loss of the muffler and cause the decrease of the muffler performance.
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