The mechanism of tractive performance of a 5.88 [kN] weight, two-axle, four-wheel drive vehicle moving up a sloped weak sandy terrain is theoretically analysed. For the given dimensions of the vehicle and the given terrain-wheel system constants, the relations among tractive effort of the vehicle, amount of sinkage of the front and rear wheels and slip ratio were analysed by use of a simulation method. The optimum height of application of force and the eccentricity of the center of gravity of the vehicle to obtain the largest value of maximum effective tractive effort of the vehicle can be explained with the analytical simulation program. Results of this study showed that the optimum eccentricity eopt for the application height H=14 [cm] should be always controlled to be -0.20 and -0.25 for the slope angle β = π/36 [rad] and π/18 [rad] respectively. The optimum height of application of force Hopt of the vehicle should be always controlled to be 14 [cm] for the eccentricity of the center of gravity θ = -0.20, and for the slope angle β = π/36 [rad].
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