Comparison of the traffic performance of a two-axle four wheel drive (4WD), rear wheel drive (RWD), and front wheel drive (FWD) vehicle on loose sandy sloped terrain
Comparison of the traffic performance of a two-axle four wheel drive (4WD), rear wheel drive (RWD), and front wheel drive (FWD) vehicle on loose sandy sloped terrain
The traffic performances during driving and braking of a 5.88kN weight wheeled vehicle with two-axle four wheel drive, rear wheel drive, and front wheel drive running up and down a loose sandy sloped terrain were compared by means of a simulation. For the given dimensions of the vehicle and the given terrain-wheel system constants, the relationship between the effective tractive and braking effort of the vehicle, the amount of sinkage of the front and rear wheels, the total amount of sinkage of the vehicle, and the slip ratio were calculated to estimate the optimum height of of force application and the optimum eccentricity of the center of gravity of the vehicle. It was observed that, during driving acton, the maximum effective tractive effort of the four wheel drive vehicle (4WD) was larger than that of the rear wheel drive vehicle (RWD), which in turn was greater than that of the front wheel drive vehicle (FWD). During the braking action, the effective braking effort at skid -20 % of the four wheel vehicle (4WB) was larger than that of the front wheel brake vehicle (FWB), in turn greater than that of the rear wheel brake vehicle (RWB), when the two-axle four wheel vehicle is moving up or down the loose sandy sloped terrain. The maximum terrain slope angle up which the two-axle wheeled is able to move during driving action was found to be about 0.067 pi rad for the 4WD vehicle, about 0.031 pi rad for the RWD vehicle, and about 0.017 pi rad for the FWD vehicle. The effective braking effort at skid -20 % of 4WB, FWB and RWB was found to decrease with slope angle.
Dokumentinformationen
Comparison of the traffic performance of a two-axle four wheel drive (4WD), rear wheel drive (RWD), and front wheel drive (FWD) vehicle on loose sandy sloped terrain
Journal of Terramechanics ; 34 , 1 ; 37-55
1997
19 Seiten, 18 Bilder, 1 Tabelle, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
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