The general concept of block-modular construction of forest tillage tools

2020

J. Phys.: Conf. Ser.

The problems of studying the static lateral 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. At the same time, all the basic structural elements and their geometric and mass-inertial parameters were preserved. The tractor was aggregated with front and rear mounted modular implements. To study the lateral stability, the tractor is mounted on a virtual stand consisting of a fixed base and a platform that changes the angle of inclination. Using a virtual stand, the lateral stability angles of three typical configurations of a machine-tractor unit and a tractor without attachments were obtained. For a tractor without attachments, the rollover angle was 34°, it was equipped with a single-beam rear mounted implement 36° (scheme 0 + 1), with a double-beam rear mounted implement 25° (scheme 0 + 2), with a front mounted implement and a double-beam rear mounted implement 36° (scheme 1 + 2). Verification of simulation data was carried out by comparing with experimental data obtained at a stationary stand. The difference in the values of the critical angles of lateral stability of the tractor, obtained by the results of virtual modeling and using the method of rollover the tractor on a stationary stand, is 3 … 5°.

A study of the static lateral stability of a tillage machine-tractor unit on a virtual stand

2020

J. Phys.: Conf. Ser.

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

2020

J. Phys.: Conf. Ser.

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.

Study of driving dynamics of modular forestry tillage machine-tractor units in CAE SolidWorks Motion

IOP Conf. Ser.: Earth Environ. Sci.

2020

The issues of simulation studies driving dynamics of wheeled forestry machine-tractor units on the surface with obstacles are considered. The method of simulation modeling in CAD SolidWorks and CAE SolidWorks Motion is used. A simplified 3d-model of the MTZ-82.1 agricultural wheeled tractor was created, preserving all the main geometric and mass-inertia parameters of the moving elements. The tractor model was equipped with front and rear mounted modular forest tillage implements in the transport position. The research was performed on a virtual track with four different types of obstacles similar to those found in forest conditions. In a computer experiment, three different schemes of units were studied and the following parameters were obtained: wheel lift height, lateral displacement of the center of gravity, and linear speed fluctuations. Analysis of the results showed that the 0+1 scheme (rear-mounted single-row harrow) was the most stable. The heaviest scheme 1+2 (front-mounted drum chopper and rear-mounted two-row harrow) also had satisfactory stability. The least stable was a tractor equipped according to the 0+2 scheme (rear-mounted two-row harrow). The virtual experiment allowed us to study the dynamic stability of various forestry units in the transport position and establish the most stable configurations.