Noise Meter - Analysis of Automobile Noise Sources and How to Suppress the Main Noise Source
The noise of cars is mainly divided into self noise and external noise. Self noise is comparable to the noise generated by external road friction and air friction. However, in terms of self noise, engine operation is the main source of noise. As long as we understand the causes of noise, whether it is self or external, whether it is primary or secondary, we will manage and suppress it with a targeted approach.
When we drive, we all hope to have a quiet driving environment inside the car, either listening to the radio or listening to music. Sometimes, it goes against our wishes. There are various types of noise in our car, why is there so much noise in our car? Where do they all come from?
Firstly, due to its own noise, a car is mechanical, which requires various systems such as an engine, transmission system, braking system, etc. to form a complete vehicle, including the commonly used air conditioning system in summer. These systems will produce mechanical noise to some extent during operation, which is proportional to speed. Most of the parts of a car, including the frame and sheet metal, are made of metal, which has a strong ability to transmit noise. Therefore, the noise from the car itself cannot be ignored.
Secondly, the noise from the outside of the vehicle, which is the friction between the ground and the tires, is called tire noise. Poor road conditions are the main reason for increasing tire noise, and vehicle speed is also a factor. The noise generated by the friction between air and vehicles is called aerodynamic noise. The aerodynamic noise is also divided into wind noise and cavity resonance, which are related to the manufacturing process of the vehicle, door sealing, and vehicle speed.
We understand the source of noise inside the car, and we can aim to eliminate such noise as much as possible. For example, when driving, especially at high speeds, we should try not to open the windows to reduce the generation of wind noise. The air conditioning in the car should not be too large, and the speed should be moderate or not too high, which can reduce the noise. In addition, before buying a car, do some understanding of the assembly process. Generally, imported cars have better precision than domestic cars, and large brands are better than small brands. The higher the price, the better the quietness inside the car.
