In the United Kingdom approximately 92% of the population is exposed to traffic noise, 28% of the population 'object' to noise nuisance from road traffic whilst at home, with 72% claiming to be 'angered' by it. At moderate to high speeds (i.e. above 50km/h for cars and 60km/h for trucks running on dry roads) the sound generated by the tyres rolling over the road is the dominant noise source. Our work aims to provide a better understanding of the mechanisms governing tyre/road noise generation, so that quiet tyres can be designed.
A mathematically-based model is being developed to predict the exterior noise generated at the tyre-to-road interface under various conditions of traffic operation. A combination of analytical and numerical techniques are being used to obtain an acoustic wave propagation model, describing the influence of the overall tyre/road geometry on the generation and propagation of acoustic waves. Appropriate mechanical models will be developed for tyre vibration in and around the contact patch. The coupling of the acoustic and vibration models will lead to a noise prediction scheme capable of identifying the effects of speed and tyre/road surface characteristics. This model will be validated against experimental data on a rolling road and on real road surfaces.
Collaborators and Support
Dunlop Tyres Ltd, Rover Cars, Transport Research Laboratory, EPSRC and Cambridge European Trust.