Rebrov O. Scientific substantiation of increasing of wheeled agricultural tractor’s propulsors efficiency on energy intensive technological operations of soil tillage

The dissertation is devoted to the decision of a scientific and applied problem of increase of efficiency and ecological friendliness of wheeled tractor propulsors at performance of a complex of agricultural operations at the expense of a scientifically proved choice of standard sizes of tires and rational modes of their functioning. The factors influencing the efficiency of interaction of the tractor with the soil environment, as well as possibilities of increasing the efficiency of wheeled tractors are analyzed. Modern innovative tire designs, systems, devices and design measures aimed at increasing the efficiency of wheeled tractors are considered. The principles of identification of the mathematical model of tractor tires are given, the analysis of tire doubling and methods of ballasting the tractor, including filling the tires with liquid, is presented. The methodology of a new approach to determining the main design parameters of wheeled tractors has been formed. A method is given for determining the potential traction characteristics and technical and economic indicators of tractors, taking into account the operating modes of the internal combustion engine, the parameters of pneumatic tires and their interaction with the soil. The prospects of a traction-dynamic model of the functioning of wheeled tractors on typical agricultural operations using PowerMix field cycles, which are generally recognized cycles of the traction-dynamic test procedure, are shown. The main scientific provisions, developments and recommendations offered in the dissertation are implemented in engineering and industrial enterprises.