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The role of car mufflers

(Summary description)The principle of the car muffler is that its exhaust pipe is composed of two pipes of different lengths, which are separated first and then meet.

The role of car mufflers

(Summary description)The principle of the car muffler is that its exhaust pipe is composed of two pipes of different lengths, which are separated first and then meet.

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The principle of the car muffler is that its exhaust pipe is composed of two pipes of different lengths, which are separated first and then meet. Since the difference in length between the two pipes is equal to half of the wavelength of the sound wave emitted by the car, the two lines of sound waves cancel each other when they interfere with each other when superimposed, thereby reducing the sound intensity and reducing the sound, thereby achieving the effect of noise reduction.​​
Muffler Resistant Muffler is a combination of tubes and chambers with abrupt interface, as if it is an acoustic filter, similar to an electrical filter, each cell with tubes is a mesh of the filter, the air mass in the tubes Equivalent to electrical inductance and resistance, called sound quality and sound resistance. The volume of air in the chamber is equivalent to an electrical capacitance, which is called sound compliance. Similar to an electrical filter, each tubed cell has its own natural frequency. When sound waves containing various frequency components enter the first short pipe, only sound waves of certain frequencies near the natural frequency of the first mesh can pass through the mesh to reach the second short pipe, while other frequencies Sound waves cannot pass through the mesh. It can only be reflected back and forth in the small room, so we call this structure with filtering function for sound waves as acoustic filter. Select the appropriate tube and chamber to combine. The noise of certain frequency components can be filtered out, so as to achieve the purpose of noise reduction. Resistive mufflers are suitable for eliminating medium and low frequency noise.

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