What is the box behind the exhaust tailpipe?

1 Answers
MacEli
07/30/25 9:51am
The box behind the exhaust pipe is the car muffler. The composition structure and working principle of the car muffler are as follows: Composition structure of the car muffler: According to the noise reduction principle and structure, car mufflers can be divided into three types: reactive mufflers, resistive mufflers, and impedance composite mufflers. Reactive mufflers process sound internally through components such as pipes and baffles to form expansion chambers and resonance chambers; resistive mufflers are designed to absorb sound energy by filling the pipes through which exhaust passes with sound-absorbing materials; impedance composite mufflers are a combination of reactive muffler units and sound-absorbing materials. Working principle of the car muffler: The difference in length between the two pipes of the car muffler is equal to half the wavelength of the sound wave emitted by the car, causing the two sound waves to interfere and cancel each other out when superimposed, thereby reducing the sound intensity and achieving the noise reduction effect.
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