Introduction to muffler in car
The muffler in car is a part used to reduce the noise generated by the engine of a motor vehicle. Because the length difference between the two pipes is equal to half the wavelength of the sound wave emitted by the car, the two rows of sound waves interfere with each other when they are superimposed. Attenuate the sound intensity, so that the sound is reduced, so as to achieve the effect of silencer.
Reduce engine exhaust noise, and enable high-temperature exhaust gas to be discharged safely and effectively. As a part of the exhaust pipe, the muffler in car should ensure smooth exhaust, low resistance and sufficient strength. The muffler in car must withstand 500℃~700℃ high temperature exhaust to ensure that it will not be damaged or lose its muffling effect within the specified mileage of the car.
Automobile noise mainly comes from automobile exhaust noise. Without the muffler, the noise can reach more than 100 decibels at a certain speed. The second is engine noise and tire noise. The engine noise can reach more than 90 decibels when the car is running normally, and the tire noise can reach about 95 decibels when the vehicle speed is above 90 km/h. Therefore, adding a muffler in car to the exhaust system can reduce vehicle exhaust noise by 20-30 decibels. In terms of engines, replacing diesel engines with gasoline engines can reduce engine noise by 6-8 decibels.
