APPROACHES TO PREDICT THE VEHICLE DYNAMICS ON SOFT SOIL

ABSTRACT This paper deals with the dynamic behavior of vehicles, especially on soft ground. Two different ways of simulation are described. One is based on the rigid body simulation program ADAMS, the other approach uses the Finite-Element-Method in conjunction with a dynamic solving algorithm. By the presented simulation results it is pointed out, that on soft soil a self excitation of the wheel exists which is caused by the deformation of the ground. The influence of this effect becomes critical when the second wheel of the vehicle is excited by the left back deformations of the first wheel. Additional measurements, investigating the dynamic influence on the behavior of the soil are used in a third, simple simulation model, based on the rigid wheel approach of BEKKER. The results show that the critical effect of self excitation is reduced by the dynamic damping behavior of the soil.