As for sports cars, what attracts people is not just their beautiful line design. More noteworthy is the captivating sound. For high-performance cars or sports cars with large displacement and horsepower, the roar emitted through rotation or starting due to the powerful engine function is usually referred to as sound waves. This is very ideal for car enthusiasts, but it may have a noise impact on some people. Some people modify the exhaust of ordinary household cars or even remove the muffler directly in order to increase noise, which is not advisable because it is also an illegal modification. So the question is, what is a car muffler, and what is its function and working principle?
In fact, almost every car today is equipped with an exhaust system because countries around the world have strict requirements for car noise. To reduce noise, it is necessary to install mufflers for each vehicle. Noise pollution is also a serious problem on urban roads. If not controlled, society will appear chaotic. An exhaust muffler is a device that reduces exhaust noise.
The noise reduction of mufflers is mainly divided into sound absorption and reflection, in order to achieve the purpose of noise reduction. Among them, absorbing noise is achieved by using sound-absorbing materials to reduce friction and lower the energy of exhaust gases during the exhaust process. Sound absorbing materials generally include glass fiber, steel fiber, and asbestos. Another type is a reflective muffler, which is connected by multiple series resonant chambers and porous reflection tubes of different lengths, and reduces the energy of exhaust gas by repeatedly reflecting multiple cool colors. Of course, there are also composite noise reduction methods that reduce exhaust noise through absorption and reflection.
According to the principle and structure of mufflers, they can be divided into resistant mufflers, resistive mufflers, and impedance composite mufflers. In fact, it corresponds to the three types of noise reduction methods mentioned above, namely reflection, absorption, reflection, and absorption.
The material of car muffler pipes is also different. Initially, use 304 and 409 stainless steel. The difference between the two is that 304 stainless steel has corrosion resistance and is suitable for warm southern regions. Of course, both have high temperature resistance, up to 650 degrees Celsius. Generally speaking, the temperature at the exhaust port cannot reach this height. 304 stainless steel is more expensive than 409.
The above is a brief introduction about car mufflers. Car mufflers play an irreplaceable role in urban noise reduction. You should know that when a car does not have a muffler, the normal driving noise can reach up to 90 decibels, but after installing a muffler, the noise will be reduced by 20-30 decibels, which can reduce the noise efficiency by up to one-third. As one of the urban pollutants, the existence of car mufflers has made important contributions to shaping civilized and harmonious cities.
