With the advancement of the economy, more and more people are buying cars. However, how much do you know about car mufflers? Car mufflers can be classified into three types based on their noise reduction principles and structures: reactive mufflers, resistive mufflers, and reactive-resistive composite mufflers.
1. Reactive Muffler: A reactive muffler reduces noise by creating various noise reduction units such as expansion chambers and resonance chambers through pipes and partitions inside. When sound waves propagate, they undergo reflection and interference, reducing sound energy to achieve noise reduction. Reactive mufflers have a limited noise reduction frequency range and are usually effective for low and medium frequencies but less effective for high frequencies. They are commonly used in trucks.
2. Resistive Muffler: A resistive muffler reduces noise by filling the pipes through which exhaust gases pass with sound-absorbing materials to absorb sound energy. It is effective for medium and high frequencies. However, it is rarely used alone as a car muffler and is usually combined with reactive mufflers.
Reactive-resistive composite muffler: This type of muffler is composed of reactive noise reduction units and sound-absorbing materials. It combines the characteristics of reactive and resistive mufflers and is effective for reducing noise at low, medium, and high frequencies.
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