According to the different principles and structures of noise reduction, universal elliptical bodies can be divided into three categories: resistant silencers, resistive silencers, and impedance composite silencers.
1. A resistant muffler refers to various sound-absorbing units composed of pipes, partitions, and other components inside, such as expansion chambers and resonance chambers. During the propagation of sound waves, reflection and interference occur, thereby reducing sound energy and achieving the purpose of soundproofing. The noise reduction frequency of anti silencers is limited, and they generally have good noise reduction effects on low and medium frequency bands, but poor noise reduction effects on high frequencies. Trucks often use anti silencers.
2. A resistive muffler e is a muffler that is filled with sound-absorbing material around the piping of the internal exhaust system to absorb sound energy and achieve the purpose of noise reduction. The medium to high frequency has good noise reduction effect and is rarely used as a car exhaust muffler. It is usually combined with a resistant muffler.
3. Impedance composite muffler is a muffler composed of resistant silencing units and sound-absorbing materials, which has the common characteristics of resistant and resistive mufflers. Has a good noise reduction effect on low, medium, and high frequency noise.
