汽車排氣管發出異樣的聲音是怎么回事？要是排氣管聲音是突然變大，那就可以確定是你的排氣管消音器穿孔了，會有破聲。如果想進一步的了解原由，那應該了解一下消音器的結構。
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.
汽車消音器的結構是，發動機在做功后，緊接著是排氣沖程。排氣是將氣缸內的廢氣排出。由于這時的廢氣是高溫高壓，由排氣管直接排出，將是很大的噪音。消聲器的是一個多級分流分壓的組合體。
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.
消聲器的消聲原理就是利用腔與管的適當組合，來達到兩種作用來消聲的：
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變(即聲抗的變化)使沿管道傳播的聲波向聲源方向反射回去，從而使聲能反射回原處；
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.
二是利用幾個界面的反射，使原來*一個向前傳播的聲波又回到原點，并再次折回向前傳播，該點與尚未被反射的第二個向前傳播的聲波匯合，而且兩者在振幅上相等，在相位上差180度的奇數倍，從而互相干涉而抵消。
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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