BRAKING PERFORMANCES OF A TOWED RIGID WHEEL ON A SOFT GROUND BASED ON THE ANALYSIS OF SOIL-COMPACTION

抄録

To predict the braking performances of a towed rigid wheel on a soft ground, a new analytical method based on the soil-compaction has been presented. The contact pressure distribution around the peripherical contact part of the rigid wheel, especially the resultant stress between the normal stress and the shear resistance should be calculated by use of the dynamic pressure sinkage curve, considering the rolling locus of the wheel in the direction of the external resultant force between the effective braking force and the axial load. From the plate loading and unloading test, and the plate traction and slip sinkage test, the fundamental terrain-wheel system constants should be determined precisely. And then, the effective braking force could be calculated as the summation of the braking force i.e. the integration of shear resistance developed on the peripherical interface and the locomotion resistance calculated from the total amount of sinkage. As the results, the analytical relations between the braking force, the effective braking force and the slip ratio, the compaction resistance and the slip ratio, the amount of sinkage and the slip ratio, the amount of eccentricity of resultant force and the slip ratio, and the entry angle, the exit angle and the slip ratio could be verified experimentally.