Machinery & Energetics

During the operation of machine-tractor units, the contact between the wheel and the ground occurs. When interaction is observed deformation and compaction of soil, which negatively affects the change in its structure. In order to reduce the negative impact on the soil, it is necessary to determine the optimal structural parameters of the wheel propulsion of machine-tractor aggregates. The article deals with the interaction with the wheel of the wheel propulsion and the existing models of interaction of the wheel with the bearing surface, depending on the parameters of the modern agrotechnological bus. An analysis of the existing models of the interaction of the wheel with the support surface was performed to determine the dependence of the contact area of the wheel on its geometric and structural parameters, such as geometric deflection, radius, diameter and pressure in the tire. The experimental analysis of the contact points of the modern agrotechnological tire was performed. On the basis of analysis of the prints of the modern agrotechnological tire and existing models of interaction of the wheel with the bearing surface, perfection of the mathematical model of interaction of the wheel with the soil was performed. An improved mathematical model allows determining the area of the contact spot depending on the properties of the agrotechnological bus, the pressure in it, and allows you to determine the distributed load on the elemental part of the bearing surface. The obtained results allow to carry out mathematical modeling of the distribution of normal stresses in the soil, depending on the mass indices of the machine-tractor unit, the structural and technological properties of the tire, is used. Application of the obtained mathematical model in combination with the model of crush and destruction of the fertile soil layer will allow us to select the type of tires and the required working pressure to minimize the harmful effects on the soil.

wheel propulsion, machine-tractor unit, normal voltages, contact spot, bearing surface, tire pressure