coecient of rolling resistance

Abstract: This paper deals with the rolling resistance of heavy vehicle tyres measured on a large drum under dynamically varying vertical load. The aim is to simulate in the laboratory the dynamic loading conditions arising from interaction of the vehicle with a randomly rough road. A dynamically varying vertical force is generated using a hydraulic actuator. A comprehensive set of experimental data for two dierent truck tyres is presented, and the inuence of dynamic load on the mean rolling resistance is quantied and discussed. The measurements indicate that there is no signicant eect of dynamic vertical load on the mean rolling resistance of the two tyres tested