The Effect of Tire Deformation on the Critical Speed of the Vehicles on Wet Roads

Abstract

In this research many tyre and environmetal parameters had been studied and their effect on the maximum critical speed was monitored during driving on a wet road. These parameters are tire deformation tire width, tire radius, wheel load, number of grooves, groove depth, groove width and the (Aspect Ratio). And external parameters, such as water layer thickness, and the dynamic viscosity of the water. The region of the tire road contact is considered as a convergence surfaces, therefore the same mathematical model that used in the conventional bearing, had been implemented, hence Reynolds equation have been solved numerically using the finite difference technique and the results afterward are obtained for the pressure value at each point in the contact region.The results show that increasing the tire deformation, tire width, tire radius, the thickness of the water layer on the road surface, and dynamic viscosity of water, have a negative effect on the critical speed of the vehicle (decreasing ). While increasing of the wheel load, numbers of grooves, groove depth, groove width and the aspect ratio, have a positive effect on the critical speed of the vehicle (increasing).Generally speaking, the tyres with small deformation have a better driving performance for the vehicles compared with that of large deformation during driving the vehicle on wet roads.