Cars are a luxury that people buy for comfortable driving and less tiring journeys. Any disturbance while driving, whether around the city or while on vacation, can be irritating and uncomfortable. Noisy tyres are a major contributor to the disturbances that you could face while driving. In this article, we’ll discuss the noise source of tyres and how to avoid this problem.
Noise is anything that causes auditory disturbance and is unpleasant to listen. Sound sources, like solids, can cause vibration and release them into the air in the form of air vibrations. The more the objects move and vibrate, the more is the noise generated.
While driving in the range of 60 to 120 km/h, tyres are the primary source of noise from cars. Not only is it disturbing and uncomfortable for the driver, but also to the people around and the environment. This can be an issue for the people who live near roads. It is disturbing as well as harmful to them.
Noise can nowadays be reduced using modern surfaces. They are 2.5 times more costly than normal ones, but the comfort and environment friendliness makes it worth it. The noise on the highways and freeways, near inhabited areas, have been controlled by reducing the speed limit of cars.
You can do your part and reduce this noise pollution as well. You can do so in two ways:
Maintain your car exhaust system
Use silent tyres. They can reduce the noise generated by up to three times than standard wheels.
Sources of Tyre Noise
Different tyres have different frequencies that they resonate at and tremble the most. When the frequency absorbed is close to the tyres’ resonating frequency, the tyres instead of reducing it, magnify it. The problem increases when the tyres’ frequency is close to that of the car’s frequency. This is also a reason why people find a set of tyres silent, while some may find the same set noisy for their cars. To compile it, it is basically about what we drive, where we drive, and what tyres we use. Different road conditions, as well as the frequency of the faults in the roads, affect the noise generated. This also explains why the coordination between the road builders and tyre manufacturers is important for the comfort of car drivers.
When a car is moving, the tyres and the road are in constant contact. This contact results in tyre deformation and generates noise. Some of the reasons that create noise are:
• The impact of tread blocks and the road result in vibrations on the steel belts. These steel belts then generate the noise – a wailing and rumbling sound.
• The air in tread grooves compresses and releases. Air resonating in the tread blocks and the air being released from the back of the tyre are two effects that produce noise.
• Vibrations of the tread blocks when they contact the road and when they leave contact as well.
• Tyre pressure is too low.
Need for Tyre Comfort
When talking about tyre comfort, we’re talking directly about tyre noise. Not known by many, tyres are one of the elements in the car that provide comfort while driving. They are responsible for absorbing the vibrations and shocks that the irregularities of the road cause. When tyres are not maintained and are in poor condition, they result in creating noises and providing discomfort while driving, which is precisely the opposite of what is expected from them.
However, we should keep in mind that comfort is something that is not the same for everyone. Comfort levels and requirements can differ from person to person. For some, the excessive noise from summer tyres might not be an issue, whereas others might not approve of it. It depends on a person’s perception, cultural factors, the specific situation, and also any personal weakness. Tyre noise also matters as the disturbance could have psychological discomfort for the driver. Hence, you find that people tend to have specific tyre preferences of their own, and have more idea about their performance capabilities.
Reasons for Uncomfortable Tyres
The discomfort caused by tyre noises is mainly because of the three reasons mentioned below:
Manufacturer’s negligence towards comfort while being more focused on other parameters.
The model created from the design assumptions has this as a characteristic.
Tyres are of low quality and/or have productions errors.
A consequence to the tread patterns, tyre structure and its size on the shoulders of the tyres.
There must be a balance between flexibility and stiffness. While some tyre models are created to meet the speed and the load index, they lose their dampening properties in exchange.
Tyre Noise Index
The bigger tyres you buy for your car, with a larger diameter and width than the recommended size, the less comfortable they are. This is the reason why it is suggested to avoid using/purchasing bigger tyres and tyres with higher load index than what is manufacturer suggested for your vehicle. High profile tyres are considered the most comfortable. These are really good for cushioning and also are comparatively quieter than the other tyres. One big reason known for the dissatisfaction of its users is that they are more susceptible to tilts and rocking.
The reasons for lower noise generation are:
• Absence of closed spaces in directional treads
• Softer rubber mixture
• Asymmetrical and irregular arrangement of tread surfaces of different shapes
• Special grooves are shaped. This is done to avoid coinciding of their entrances and exits with the tread edge.
There is always a comparison between summer and winter tyres, and there is a question regarding which is better. Silent summer tyres have a bit of an upper hand when compared to the almost equally efficient silent winter tyres.
Latest silent winter tyres are known to be very comfortable, while also having a large number of sipes on the tread surface.
Acceptable Tyre Noise Level
It is not difficult for manufacturers to meet the currently approved noise levels. The recorded differences between individual tyres are of an average of 6-8 dB (A). Many models, including the quietest summer tyres, are known to be recorded 4-6 dB (A) below the required limit, whereas a big part of them are also known to be approaching 2dB (A). These restraints are set out in Regulation No. 117 of the United Nations Economic Commission for Europe (UNECE). These are a set of uniform provisions for the approval of tyres with regard to rolling tyre emissions. It also concerns their adhesion on wet surfaces.
Currently, models achieving 67dB (one wave) are being awarded the best noise category. 68DB is a great achievement as well (still one wave).
Effect of Tyre Comfort on Performance
Any mechanical discomfort caused by vibrations in the car is directly related to noise. Low profile tyres are more prominently known to produce more noise. They are less comfortable as they are wider, are of low profile, have greater stiffness on the sides, and because the vibrations are more noticeable.
Comparing tyres before buying them is very important. This also means that the tyre model may have to sacrifice some of its performance abilities to gain the upper hand in other aspects. For example, if the tyre is designed to be quiet, then the tyres might lose their compliance on wet surfaces and their resistance to aquaplaning. Another way to design a quiet tyre is to craft small tread blocks. But, a car owner’s love for tyre visuals should also be kept in mind while doing so, as this could reduce the attractiveness of the tyres.
The importance of comfort and noise rating for tyres Stockport is still debatable, as it can’t be compared with abilities like tyre grip and cornering control. For any assistance related to tyres Stretford, contact our experts at Gilgal Tyres where we assure you 100% satisfaction.