汽车排气管发出异样的声音是怎么回事？要是排气管声音是突然变大，那就可以确定是你的排气管消音器穿孔了，会有破声。如果想进一步的了解原由，那应该了解一下消音器的结构。
What is the unusual sound of a car exhaust pipe? If the exhaust sound is suddenly changed, then you can determine your exhaust muffler is perforated, there will be a horse. If you want to get a better understanding of the reason, you should know the structure of the muffler.
汽车消音器的结构是，发动机在做功后，紧接着是排气冲程。排气是将气缸内的废气排出。由于这时的废气是高温高压，由排气管直接排出，将是很大的噪音。消声器的是一个多级分流分压的组合体。
The structure of the car muffler is that after the engine is doing work, it is followed by the exhaust stroke. Exhaust is the exhaust of the exhaust gas in the cylinder. Because the exhaust gas is high temperature and high pressure, the exhaust pipe is discharged directly, it will be a lot of noise. The muffler is a multistage split pressure combination.
消声器的消声原理就是利用腔与管的适当组合，来达到两种作用来消声的：
The noise elimination principle of the muffler is to make use of the proper combination of the cavity and tube to achieve two kinds of action to eliminate the sound.
一是利用管道截面突变(即声抗的变化)使沿管道传播的声波向声源方向反射回去，从而使声能反射回原处；
The first is to make use of the mutation of the pipe cross section (that is the change of acoustic resistance) to reflect the sound waves propagating along the pipeline back to the sound source, so that the sound energy is reflected back to the original place.
二是利用几个界面的反射，使原来*一个向前传播的声波又回到原点，并再次折回向前传播，该点与尚未被反射的第二个向前传播的声波汇合，而且两者在振幅上相等，在相位上差180度的奇数倍，从而互相干涉而抵消。
Two is the use of the interface reflection, the first wave propagates back to the origin, and again back propagating the point and has not yet been second forward propagating acoustic wave convergence of reflection, and both are equal in amplitude difference, odd times 180 degrees in phase, so as to interfere with each other and offset.
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