Theoretical study on linkage unit of wide span tractor

Abstract

In order to ensure the stable motion of the wide span tractor, the design of its linkage has to provide for its independent turning on the horizontal plane. That implies the high priority of the issue of substantiating the parameters of the wide nspan tractor linkage unit. The aim of the study was to improve the efficiency of operation and application of wide span tractors through the substantiation of the parameters of their linkage units. The study uses as its basis the fundamental principles of the theoretical mechanics, the theory of tractor, the statistical dynamics and the theory of automatic control of linear dynamic systems responding to statistically random controlling and perturbing input actions. Following the results of the undertaken investigations, it has been established that the most desirable setup of the wide span tractor’s linkage unit in terms of the tractor’s response to the controlling action (angular displacement of steering wheels) and perturbing action (angular displacement of linkage unit on the horizontal plane) is when the instantaneous centre of turn situated at the point of convergence of the centrelines of the lower draught links coincides with the tractor’s centre of mass.