THE INFLUENCE OF BELT DYNAMICS ON CORNERING AND BRAKING PROPERTIES OFTIRES

The dynamic tyre behaviour is studied by means of experiments and a dy namic tyre model. To represent the tyre dynamics up to approximately 6 0 Hz a rigid ring model is used. The tyre-road interface is modelled u sing a steady state tyre model in conjunction with the relaxation leng th concept to describe the longitudinal and lateral force and the alig ning moment generation properties of the tyre. Residual compliances ar e introduced to account for the large carcass deformations near the ty re contact patch. The measured frequency response functions of forces and moments with respect to the applied steering angle or brake torque are used to estimate the tyre parameters. From the experiments the to tal tyre relaxation length is determined as function of the level of s lip and the normal load. The influence of the velocity on the natural frequencies of the belt is shown as well.