RESEARCH INTO MODELS OF CHOICE OF TRACTOR AGGREGATES

The article deals with three different models of the choice of tractor aggregates characterised by different installed conditions of the performed work. Such conditions are: a definite amount of the performed work; fixed agrotechnical terms for completion of the work; possible losses of the yield of crops because of deferred completion of the work in relation to the optimum terms. A method of economico-mathematical simulation is applied. The essence of the method for the choice of tractor aggregates lies in the determination of minimal specific variable losses taking into account the factors indicated above. Using the results of the data calculation, a limit was shown for efficient application of aggregates selected from each of the models. The proposed method allows motivated choice of an economically efficient tractor aggregate depending on the installed conditions of the performed work, as well as prognostication of economic expediency for renovation of the machinery mentioned above. Solver, a superstructure of the MS Excel, was used for the calculation of the mathematical model solving it as a task of optimising non-linear programming. As an example, there is given a choice of sowing tractor aggregates, using various models.