Analysis of design features trailed and semitrailer tanks as part of the machine-tractor unit

Abstract

The aim of the work is to substantiate the choice of a machine-tractor unit with a landing gear and semi-trailer tanks when forming a dynamic model of rectilinear movement over complex terrain due to an integrated approach in the analysis of modern agricultural machinery. As a result of calculating the coefficient of energy saturation of wheeled tractors according to the criteria of the same size of the front and rear tires, as well as the range of engine power change 200 ÷ 500 hp, the world brands of tractors are given: Claas, Case, New Holland, John Deere, KhTZ and others. On the basis of this analysis, the belonging of wheeled tractors with the same tire size to the traction or traction energy concept was established. It was established that the overwhelming majority of tractors belong to the traction and energy concept, that is, modern tractor manufacturers do not exclude operating conditions with parallel operating power take-offs, for example, when performing transport or transport-technological operations. The analysis of global manufacturers of tractor tanks used in the transportation of fluids in agricultural lands was carried out. A possible range of the amount of fluid in the tank depending on the design features of the platform (wreck) has been established. It was noted that the semi-trailer tank platform is more popular; however, for a comprehensive analysis of the redistribution of the center of mass of the liquid in the tank, it is necessary to consider both the semi-trailer and the trailer tank. Suspension system semi-trailer tank and tank trailer is designated. Simplified dynamic models of semi-trailer and tank trailers with the establishment of the control action on the overall system of the machine-tractor unit, external disturbance, the reaction of the tractor and the tank, as well as the effect of the redistribution of fluid mass on the wheel tractor are given. The main approaches to the formation of a dynamic (non-linear) model of a straight-line movement of a machine-tractor unit with semi-trailers and tank trailers are highlighted. The components of the dynamic model, which vary in the vertical and longitudinal planes, as well as during angular displacements, are described.