Sound generation and sound radiation from tyres

Paper in proceeding, 2013

The tyre/road interaction model developed by Chalmers during the last years is utilised to exam both sound generation mechanisms and sound radiation properties of rolling tyres. The model is based on a very advanced tyre model, a fully non-linear contact model, and a radiation model including the surface of the road. The model is successfully validated. The two main mechanisms, tyre vibrations and air-flow related mechanisms – often called air-pumping – are analysed from measurements and from simulation results. The results indicate the strong influence of air-flow related mechanisms. Different tyre/road combinations influence this result. The so gained insight is essential for the optimisation of tyres and road surfaces. The simulations show that the lateral structure of the surface roughness can have strong influence on the generated sound at higher frequencies. The analysis of pass-by measurements also underlines the findings that at these frequencies, low order modes with respect to the cross section determine the sound radiation. Finally the influence of the road surface is investigated and the horn effect for a rolling tyre is calculated.