Tyre/road noise: myths and realities

Download

At this conference, the subject of tyre/road noise is on the agenda to a greater extent than ever before. This paper aims at giving an insight into the past, present and future of tyre/road noise emission in the society as well as its control. This is made by means of exploring some myths and realities related to the subject. The following myths are explored:

1. Tyre/road noise has become a concern only during the last decades, say from the 1970's. It is shown that already long ago tyre/road noise was an important issue.

2. Tyre/road noise is an important part of vehicle noise at speeds above 50 km/h (70 for trucks). The truth is that nowadays tyre/road noise dominates during almost all types of driving for cars and down to about 40 km/h for trucks (vehicles meeting EU requirements).

3. Manufacturers have done a lot to reduce vehicle and tyre/road noise. Yes, in some respects; but yet it seems that vehicle noise sometimes has increased rather than decreased.

4. The speed influence is large but not very interesting. It is shown that there are unexpected relations between speed-related factors and that these can be useful in data presentation.

5. Different road surfaces may give a large variation in noise levels. True, the variation is very large, albeit the most common and useful surfaces are close together on the noise scale.

6. Tyres do not differ very much in noise emission. This is not true, the variation is large if sufficiently many tyre types are included in the data set.

7. Winter tyres are much more noisy than summer tyres. This is a myth based on the past. Currently, winter tyres may be the "quiet" tyres.

8. The width of the tyre is a very influential factor. Essentially true: A noise-width relation covering the range from "tiny" bicycle tyres to large truck tyres is presented.

9. Tyre/road noise from a heavy truck is far above that of a typical car. Not true, one may find heavy trucks that emit lower tyre/road noise than some cars.

10. Tyre/road noise is very broadband nowadays. True and not true - current tyres emit noise very much concentrated within the 1 kHz octave. Tone correction may be considered.

11. Quiet tyres are possible only if sacrificing safety. Recent results show that there is no tradeoff between low noise emission and high safety; neither with rolling resistance.

12. We cannot afford to reduce tyre/road noise. Calculation exercises are presented that suggest that low-noise tyres as well as low-noise road surfaces may be very cost efficient.

13. Tyre/road noise will be substantially reduced by the introduction of noise emission limits. Not true; the new EU emission tyre noise limits will be almost totally ineffective.

MEET US


5-6
Dec

Vision Zero for Sustainable Road Safety in the Baltic Sea Region

The conference Vision Zero for Sustainable Road Safety in the Baltic Sea Region is held i Vilnius, Lithuania. VTI is part of the organisation committé and also one of the speakers.

LATEST NEWS


2018-10-18

ADAS&ME is tackling the interaction between people and technology

ADAS&ME is a major EU project focused on automation, the human condition and the human environment. The budget is EUR 9.6 million and VTI is the coordinator.


2018-10-05

Users contribute to the development of train simulators

Apart from advanced driving simulators, VTI has developed several variations of train simulators which are used for training, education and research. In recent years, interest has increased drastically among major actors in the railway sector, and VTI has...


2018-10-03

VR study to contribute to a better working environment for bus drivers

A study where bus drivers test autonomous driving in a VR environment may contribute to a better working environment with reduced stress on the driver and safer driving.


2018-10-02

Non-native plant species spread via transport systems

Researchers at VTI have compiled a report on non-native invasive plant species in Sweden and how they spread via transport systems.


2018-09-20

EU-project VIRTUAL: improving road safety with virtual crash tests

Crash tests are used to improve safety on roads. Therefore the EU now funds a research project to develop virtual methods of crash testing. VTI coordinates the project, called VIRTUAL. The project now invites experts interested in Human Body Modeling to join...


2018-08-28

EU project protects cyclists and pedestrians

According to the World Health Organisation, more than one quarter of road traffic fatalities in 2010 were pedestrians and cyclists. Every year, about 335,000 unprotected road users die because of traffic accidents, which shows the scale of the problem. The EU...