Mufflers are the cause of noise emitted by cars. The car muffler is divided into multi-stage separation and partial pressure combination, and the principle of noise reduction is to use the reasonable combination of cavity and tube to achieve two functions. One method is to use sudden changes in the cross-section of the pipeline to reflect sound waves along the pipeline towards the direction of the sound source, causing the sound energy to be reflected back to its original location; Secondly, by utilizing the reflections of several interfaces, the initially scattered sound waves are returned to their original points, then folded back and propagated forward. This point merges with the second forward propagating sound wave without reflection, with equal amplitude and an odd multiple of 180 degrees in phase difference, thus interfering and canceling each other out.
Due to poor ignition, there is a large amount of carbon buildup on the spark plug or intake port, and the exhaust pipe must be disassembled. During the homework process, it is necessary to dismantle the exhaust pipe (if there is an external hole, it is easy to repair and does not need to be dismantled). Is there any rupture or hole in the exhaust pipe. For very small holes, they can be fixed with tin foil stickers. If there are large holes and cracks, you can ask a welding master to help weld and repair the material.
If the above repairs are not carried out, please check if the muffler inside the exhaust pipe needs to be replaced. If the economic situation allows, a new exhaust pipe can be purchased, or if the damage is severe, a new exhaust pipe must be purchased. If suddenly enlarged, it can be confirmed that the exhaust pipe muffler is perforated and there will be a sound of rupture.
The muffler structure of a sedan follows the engine's exhaust stroke. Exhaust is the discharge of exhaust gas from the cylinder. Due to the high temperature and pressure of the exhaust gas at this time, it will be very noisy to discharge it directly from the exhaust pipe. The muffler is divided into multi-stage separation and pressure division. The principle of its muffler is to use the appropriate combination of the cavity and the pipeline to achieve two types of noise reduction functions: first, to use the reflection of multiple interfaces to make the originally propagating sound waves return to the origin, and then turn back and spread. This point merges with the second forward propagating sound wave that is not reflected, with equal amplitude, equal phase, and an odd multiple of 180 degrees apart, interfering and canceling each other out; By utilizing sudden changes in the cross-section of the pipeline (i.e. changes in acoustic impedance), sound waves along the pipeline are reflected back onto the sound source, causing the sound energy to return to its original location.
