Traction-dynamic calculation of a freight road train using graphical-analytical and iterative methods

Abstract

Traction dynamics is one of the primary operational properties for all vehicles, including special-purpose road trains. Having analyzed the history of the emergence and development of the traction-dynamic calculation methodology, the authors came to the conclusion about the relevance of its further improvement. The article lists new tasks facing the traction-dynamic calculation, in particular, accounting for the mass distribution along the axles of a road train when moving uphill, standardization of longitudinal slopes of highways, calculation of the capacity of the road transport network, determination of the increment of longitudinal acceleration when shifting gears, calculation of instantaneous acceleration, calculation of the dynamics of a heavy-duty road train with activation of the trailer wheels. The authors note that the main disadvantages of the traditional methodology lie in the accepted assumptions and the graphical method of constructing curves. To solve these problems, it is proposed to use a new iterative method for constructing an external speed characteristic and an acceleration graph.