What are the main usage factors affecting vehicle exterior noise?

[DeAllison]

Here are the main usage factors affecting vehicle exterior noise: 1. Engine noise: In addition to the mechanical sounds emitted by the engine block, it also includes intake system noise, which occurs when high-speed gases pass through the air filter, intake pipe, and valves into the cylinders, generating strong aerodynamic noise during the flow process. Engine noise mainly enters the cabin through the firewall and the front floor area of the driver's compartment. 2. Tire noise: Generally, tire noise consists of three main components: first, air noise caused by airflow between tire tread gaps and air disturbance around the tire; second, tire vibration noise caused by the vibration of the tire body and tread patterns; third, road noise caused by uneven road surfaces. 3. Air noise: First, wind noise, which is generated by pressure changes due to airflow separation around the vehicle body; second, wind leakage or suction noise, caused by the interaction between air entering through gaps in the driver's compartment and body and the surrounding airflow; third, other noises, including cavity resonance. 4. Body structure noise: This is mainly influenced by two factors: first, the vibration transmission method of the body structure, and second, noise generated by the vibration of metal components in the body due to internal and external forces.