1. Air noise. First, there's wind noise, which is generated by pressure changes due to airflow separation around the vehicle body; second is wind leakage, also called suction noise, which occurs when air is drawn in through gaps in the cabin and body and interacts with surrounding airflow; third are other noises, including cavity resonance.
2. Body structure noise. This is mainly influenced by two factors: the way vibrations are transmitted through the vehicle body structure, and the noise produced by the vibration of metal components on the body due to internal and external forces.
3. Engine noise. In addition to the mechanical sounds from the engine itself, this also includes intake system noise — that is, the strong aerodynamic noise generated as high-speed air flows through the air filter, intake manifold, and valves into the cylinder. Engine noise primarily enters the cabin through the firewall and the front floor panel of the driver's compartment.
4. Tire noise. Typical tire noise consists of three parts: first, air noise caused by the flow of air in the tire tread grooves and the disturbance of surrounding air; second, tire vibration noise resulting from the vibration of the tire body and tread; third, road noise caused by uneven surfaces.
To deal with these noises, we can use two methods:
The first is to fundamentally eliminate or reduce the noise. To eliminate noise at the source, we first need to understand where car noise actually comes from. By identifying the different sources of noise in your car, you can apply the right solution to tackle the “noise,” achieving effective results. For example, if the noise is from the tires, you can opt for tires with lower noise levels to reduce the noise. That’s how you solve the problem at its root.
The second method is to perform full-car soundproofing, which is what most people choose — so we’ll focus on explaining this. Although it may not seem much quieter from the outside, it will be significantly quieter inside the cabin. Car soundproofing is generally suitable for vehicles with lower configurations, average comfort levels, or even more budget models. For high-end cars, the original soundproofing is already quite good, and spending money on additional soundproofing would be redundant. Some car owners have questioned the effectiveness of upgrading their car’s soundproofing, believing that the improvement is minimal or even non-existent, and that it adds extra weight and fuel consumption. This is mainly due to choosing inappropriate brands or low-quality soundproofing materials.
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