The aim of the study was to determine whether the "Magic Formula" tyre model parameters could be varied to approximate the effects of a changing road surface. It appears that if laboratory tyre force and moment data are used then the model cannot simulate vehicle performance under actual road conditions accurately. Using the "Magic Formula" tyre model and two coefficients it was possible to correct lateral force data from laboratory machines or other sources for a specific road surface. These correction coefficients can either be obtained directly from road force and moment testing or be derived from test data from actual vehicles. They represent a powerful and simple method of improving performance of vehicle simulations over a wide variety of road surfaces.
Abstract