Hamersma, Herman AdendorffBotha, Theunis R.Els, Pieter Schalk2017-05-242017-05-242016Hamersma, H.A., Botha, T.R. & Els, P.S. 2016, 'The dynamic rolling radius of a pneumatic tyre on hard terrains', International Journal of Vehicle Systems Modelling and Testing, vol. 11, no. 3, pp. 234-251.1745-6444 (online)1745-6436 (print)10.1504/IJVSMT.2016.080879http://hdl.handle.net/2263/60630Extensive research was done on the rolling radius of a tyre from the 1960s to the 1980s, specifically looking at the tractive performance of tractors and agricultural vehicles. The research was limited to investigating slip conditions at low vehicle speed where it was safe to assume that the rolling radius is static or quasi-static. This paper revisits some of these investigations, and looks at the validity of the static or quasi-static rolling radius assumption on hard, high friction and uneven surfaces at higher speeds. The aim is to establish whether the rolling radius defined under static conditions can be used to estimate tyre contact patch velocity, a state needed to determine longitudinal tyre slip. Longitudinal tyre slip plays a crucial role in the performance of advanced driver assist systems. It is known that these systems' performance decreases on rough roads when the static rolling radius assumption may become inaccurate.English© 2016 Inderscience Enterprises Ltd.Kinematic rolling radiusKinetic rolling radiusContact patch velocityDigital image correlationWheel force transducer measurementTyre modellingRoughnessTerrainTiresTurning radiusPneumatic tiresRough terrainDesignHighwaysVehicles and equipmentEngineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-11SDG-11: Sustainable cities and communitiesEngineering, built environment and information technology articles SDG-12SDG-12: Responsible consumption and productionPostprint Article