Permissible ground pressure of wheeled forestry vehicles depending on the ground conditions

Abstract

The aim of the work is to investigate interrelations between wheeled vehicle pressure on the ground and its cross-country ability. To comply with the requirement of ecological compatibility of the mover, which is that the rut depth after the passage of the vehicle should be less than 0.1 m, the pressure of the wheeled mover when working on moderate forest soils should not exceed 0.07 MPa (a forwarder 8x8 with a loaded weight up to 31 tons), on weak forest soils the pressure should not exceed 0.025 MPa (a forwarder 8x8 with a loaded weight up to 11 tons). On moderate soil to ensure cross-country ability, the pressure should be limited to 0.095 MPa (a forwarder 8x8 with a loaded weight up to 42 tons) (slipping ratio reaches 0.2, the depth of the rut is 0.18 m, the operating speed of the machine 1.5 m/s). To ensure the wheeled vehicle cross-country ability, the average pressure when working on weak forest soils should be limited to 0.04 MPa (a forwarder 8x8 with its loaded weight of up to 18 tons) (slipping coefficient reaches 0.136, rut depth of 0.253 m, the operating speed of the machine 2.8 m/s).