The working principle of exhaust muffler
Time of issue:
2025-03-12
Resistive noise reduction: the use of porous sound-absorbing materials (such as glass fiber, steel fiber, asbestos, etc.) to absorb sound energy.
Resistive noise reduction: the use of porous sound-absorbing materials (such as glass fiber, steel fiber, asbestos, etc.) to absorb sound energy. When the exhaust gas passes through the porous material, the sound waves are converted into heat energy in the pores and dissipated, thereby reducing noise. The resistive muffler has a good effect on medium and high frequency noise.
Resistant silencing: By changing the flow path and speed of the exhaust gas, the sound wave reflection and interference principle are used to silencing. Resistant mufflers usually include partitions, expansion chambers and other structures to reflect and interfere with exhaust gas in the chamber and reduce sound intensity. Resistant muffler has a significant effect on medium and low frequency noise.
Impedance compound muffler: It combines the characteristics of resistive and reactive muffler, balances the characteristics of the two, and has a wide muffler range.
Active noise reduction: the use of electronic equipment to generate sound waves equal to the original sound pressure but opposite in phase, within a certain range, the original sound field cancels each other out to achieve the noise reduction effect. Active silencers require components such as microphones, amplifiers, phase-shifting devices, and speakers to work together.
Other principles: such as the use of micro-perforated plate sound absorption structure, small hole noise reduction and other principles made of muffler, but also has their own muffler characteristics and advantages.
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