Mathematical Modelling of the Process of Renewal of the Fleet of Combine Harvesters

The new optimization task within the integrated model of the renewal of the fleet of harvesters has been considered in this paper. The aim of the study is generation of the mathematical model for the renewal of the combine harvester fleet on the basis of integral equations with an unknown lower limit of integration. The integro-functional equations for main trajectories have been obtained, and the qualitative behaviour of main trajectories depending on the rates of scientific and technological advancement has been studied.