Study driving dynamics of the machine-tractor unit on a virtual stand with obstacles

Abstract

The problems of studying the dynamic stability of machine-tractor units by the methods of multi-body dynamics (MBD) are considered. To create a simulation model, the virtual modeling method in CAD SolidWorks and CAE SolidWorks Motion was used. A 3d model of the MTZ-82.1 tractor was created, equipped with front and rear mounted three-point linkage. The tractor was aggregated with modular implements. To test the machine-tractor unit, a test track was simulated, consisting of four sections with various non-movable obstacles: Single linear; single sequential; group linear; group sequential. In the process of modeling, the following parameters were recorded: Lifting height of the geometric center of the wheels; displacement of the machine-tractor unit center of gravity in the transverse direction; linear speed. An analysis stages movement of the machinetractor unit showed that overcoming a single linear, single sequential and group linear obstacles at a speed of 0.9 m/s occurs without loss of stability. Only when overcoming a group sequential obstacle, significant oscillations in the tractor frame are observed, however, due to the balancing suspension of the front wheels, they do not always lead to the rollover of the tractor. In the future, using the developed virtual stand, it is possible to carry out studies of the dynamic stability of various configurations of a machine-tractor unit. It is also possible to change the geometry of obstacles, the angles of inclination of the support surface, the speeds of motion, the contact parameters of the wheels, etc.