Abstract
This paper presents the results of an investigation into the effect of terrain conditions on vehicle velocity at each given vehicle speed selection in wet clay and sand terrain beds. Wheeled vehicles face mobility challenges when traversing in deformable terrain resulting in reduced velocity. This experimental modelling-based investigation was carried out using a modified and instrumented wheeled mobility scooter named MOBILITY SF-3713. This vehicle was run on non-deformable pavement in order to obtain reference results. It was then run on wet sand and clay terrain test beds under controlled laboratory conditions. Results from this experiment indicated that terrain type, applied load and tyre inflation pressure all have significant effects on velocity, influenced by tyre rutting in deformable terrain. The results suggest that reliable prediction of this relationship can assist earth moving and deformable haulage road engineers in making economic operational decisions that affect the velocity of wheeled plant.
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