Abstract
A mathematical model of multi-axle wheeled vehicle motion over the bearing surface is presented in the article. An equation system describing the vehicle motion over the snow road bed is given. The formation of resistance to motion force is considered. Dependences to calculate the basic components of external resistance are given: resistance force due to the snow road bed vertical deformation; resistance force due to excavation-bulldozer effects and dependence for the drag force calculation. Field tests allowed to analyze dependence of pressure distribution in extra-low-pressure tire flat spot with snow and to compose a stress distribution equation. Consideration of real pressure distribution in the flat spot when calculation drag force for snow-and-swamp-going-vehicles of «Кержак» (Kerzhak) family having 4x4 and 6x6 wheel-arrangement allowed to get an error of theoretical and experimental data of not more than 15%.
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