What is the acceptable level of tyre noise? In many cases the high level of noise of a tyre is also the result of errors, imperfections or conscious decisions made by the manufacturer (for example, in order to improve other important performance parameters such as grip). In other words, the tyre, the vehicle, and the road surface (roughness, frequency of lateral bumps, etc.) are all significant factors. This may be the reason why some car tyres are regarded as quiet by some drivers, and by others as noisy. A greater problem occurs when this frequency is also close to one of the natural frequencies of the vehicle. Then, instead of absorbing noise and vibrations, the tyre amplifies them. Problems arise when this frequency is close to the frequency of the stimulation (which results from, for example, the roughness of the road). Tyre comfort and noise are tested by various methods (photo: Vredestein).Įvery tyre has a natural frequency – the frequency at which it vibrates most strongly. This air vibrates when the tyre is moving in contact with the road and can be heard within the car. ![]() The most prominent interior noise we hear is tyre cavity resonance which is caused by the air that fills the space between the tyre wall and the wheel itself.When the tread blocks come into contact with the surface of the road, the vibrations of the tyre belts cause wailing and booming sounds from the tread.The main sources of noise can be listed as follows: When a vehicle is in motion, there is a constant interaction between the tyres and the road. In principle, the more the source (tyre) vibrates, the greater the potential noise is generated. The source of the vibrations may be a solid body (a tyre in this case) which stimulates the air to vibrate, creating pressure waves all around it. ![]() Sound consists of vibrations travelling through the air in the form of sound waves. Tyre noise is understood as the level of sound that is unpleasant or even causes discomfort to the driver, passengers and bystanders. noise) as well as the overall driving comfort (tyre vibration, resonance effects, shock absorption, etc.). It basically covers acoustic comfort (i.e. In the context of tyres, comfort is a broader concept than noise.
0 Comments
Leave a Reply. |