Three Dimension FEA Simulation Of The Vehicle's Tire Running On The Sludge Road

When a vehicle is running on a sludge road, the contact force between its tires and ground will decline as car velocity increases because of the dust, water and the liquid material getting into the tire's pattern, which might cause control and safety problems. Using MSC.Dytran software, this thesis presents a finite element simulation of car steering process on the sludge road. Straight grooves and V-shape groove, Complex geometry of tread pattern, are included in the proposed procedure. At the same time the tire's pressure carry out with the low 200KPa and the high 300KPa. The cement, soft and sludge roads are used to analyse comparatively. The gravity load is included in the whole analysis. Moving reference frame fixed on the traveling vehicle is adopted, instead of tire moves on the fixed road, the transverse velocity is applied to the road and tire rotated at the fixed position. A general solid-liquid coupling algorithm is used to treat the interaction of tire and sludge.After FEA simulating we get the results, such as the max contact force, the skidding velocity and the contact force's changing curve according to the changing velocity. The max contact force of two styles of tire running on the sludge road with 200KPa pressure will decline 50.3% and 48.8% respectively compared with running on the cement road. The max velocity will also decline 54.1% and 51.8%. Moreover the tire's pressure is 300KPa, the max contact force will decline 49.4% and 47.5% with the max velocity declining 59% and 55.8% too. Analyse the results we can know the contact force change little when vehicle run on the cement road. But that decline largely on the sludge road. The contact force received from the sludge road have passed there phases successively. First slowly decline with the velocity of vehicle from 0 to 30km/h, second speedy decline with the velocity of vehicle from 30km/h to 70km/h and third smoothly indeclinable state with the velocity of vehicle from 70 to 100km/h. Following the tire will skid if the velocity is enhanced because the more contact force can't be given to drive the tire.The simulating results will benefit for the tire's design to make the tire suit to different roads. On the other hand the inertia of whole vehicle hadn't been considered on the research. In continuous studying future people can build the whole vehicle FEA model based this thesis and do the research on various roads deeply.