What is the internal structure of a motorcycle muffler?

[DiAngelina]

Motorcycle mufflers contain a silencing core inside a conical metal housing, characterized by the inward curling of the housing's rear end, parallel to the housing wall. The silencing core is composed of welded metal tubes of varying diameters, inserted into holes in the baffles installed within the housing. The advantages include effective noise reduction and long service life. Here is the relevant introduction: Noise Reduction: Motorcycle exhaust pipes primarily use porous sound-absorbing materials to reduce noise. By fixing the sound-absorbing materials to the inner walls of the airflow channel or arranging them in a specific pattern within the pipe, a resistive muffler is formed. When sound waves enter the resistive muffler, part of the sound energy is converted into heat and dissipated through friction in the pores of the porous material, thereby weakening the sound waves passing through the muffler. Resistive Muffler: A resistive muffler functions similarly to a pure resistance circuit in electronics, with the sound-absorbing materials acting like resistors. Hence, this type of muffler is called a resistive muffler. Resistive mufflers are effective at reducing mid-to-high-frequency noise but less effective for low-frequency noise.