Study on contact patch memory and travelling waves of tyres

In this study, the self-excited vibrations of the caster-wheel system are analysed. A low degree-of-freedom mechanical model is considered, in which the lateral deformation of the tyre is described both in the contact patch and outside it. The simple brush tyre model is implemented in order to obtain analytical results by means of minimum number of relevant parameters. The frequencies of the detected self-excited vibrations are resented against the towing speed. Some intricate shapes of the corresponding tyre deformations are presented based on numerical simulations