The resistive car muffler is mainly composed of porous tubes and sound-absorbing fibers (absorbent cotton). The sound absorption coefficient of the latter material varies with physical properties such as density and diameter, that is, the higher the fiber density, the smaller the diameter, and the higher the sound absorption coefficient. At the same time, the impact on the noise reduction effect is also related to the overall noise reduction effect. Of course, various factors such as cross-sectional circumference, effective length, and cross-sectional area also affect the noise reduction effect. The larger the circumference and effective length, the better the noise reduction effect.

At the moment of secondary ignition and starting of internal combustion engine vehicles, various structures begin to wear out. Car muffler manufacturers tell you that various components and consumables, including oil, need to be replaced after each mileage of driving. What about electric cars? Due to its different structure from diesel locomotives, there is not much difference in some places.

The main vibration mode of a vehicle is its exhaust system. In daily operation, the engine has a certain excitation effect on the exhaust system of the car, and the unstable road surface can also cause vibration to the exhaust system of the car. The exhaust system of the car will generate a certain excitation force during use.

As we all know, when a vehicle is driving, the high-pressure combustion air in the engine cylinder is discharged outward, which will produce 120dB of environmental noise. In order to meet the relevant requirements of automobile exhaust environmental noise, exhaust pipe muffler is a device used to reduce exhaust environmental noise.

A vehicle muffler is an effective external transmission device for controlling aerodynamic noise. Through internal structural acoustic treatment, the generation and propagation of noise can be greatly reduced without affecting the passage of airflow. After the muffler is assembled, the noise reduction should reach 20-40dB (A), with a subjective decrease of 50-90%.

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