PECULIARITIES OF TRACTION CALCULATION OF A TRACTOR SELFPROPELLED CHASSIS WHEN COMBINED WITH ATTACHMENTS AND IMPLEMENTS

Abstract

A mathematical model describing the features of traction calculation of self-propelled chassis in a hinged unit isconsidered. The peculiarities of applying a typical traction calculation to self-propelled chassis are analysed, in particular,taking into account the distribution of forces and moments in the longitudinal-vertical plane, which affect the couplingand traction capacities of the chassis. The paper considers aggregation, in which the self-propelled chassis is loaded withthe weight of the machine, which in turn affects the vertical component of the soil reaction on the working bodies. Thecalculation of traction resistance takes into account the part of the rolling resistance force caused by the normal loading ofthe self-propelled chassis from the forceful impact of the mounted machinesThus, the traction resistance of a mounted machine in a machine generally consists of the horizontal component ofthe soil reaction on the working members and the rolling resistance force caused by the tractor or self-propelled chassisloading during operation. The ratio of these components in the balance of traction resistance is determined by the adoptedmethod of aggregation and the design parameters of the machine. The ratio of these components is also influenced by theoperating conditions of the machine: with an increase in soil density, the resistance to the working bodies increases andthe rolling resistance decreases; a decrease in density, an increase in humidity and other factors increase the rollingresistance while simultaneously reducing the magnitude of the soil reaction on the working bodies.