EXPERIMENTAL AND THEORETICAL STUDY ON STRAIGHTNESS IMPROVEMENT IN AGRICULTURAL MACHINERY MOVEMENT

This research was conducted for enhancing the linearity (or straightness) of the movement of a seeding machine-tractor system (SMTS), encompassing both theoretical and experimental studies. The experimental studies were conducted using a SMTS as part of a classic all-wheel drive tractor and a pneumatic trailed seeder. Theoretical research of the SMTS was carried out for three versions of the initial parameters of the mathematical model. In the first version the speed of movement was v = 2.5 m∙s–1, the distance from the point of the seeder trailer to the centre of mass of the seeder was l5 = 2 m, and the pressure in the pneumatic tires of the tractor wheels was Pw = 0.10 МPа. In the second one, the speed of the unit is increased to v = 2.8 m∙s–1, the distance from the point of the seeder trailer to the centre of mass of the seeder is increased to l5 = 3 m, and the pressure in the tractor’s tires is Pw = 0.10 MPa. In the third versions, the pressure in the tractor tires is increased to 0.12 MPa. The difference between values O(1)(T), O(2)(T) of the trajectory of the movement of the centres of mass of the tractor and the seeder, determined during the theoretical research, and determined during the experimental research is 11%, and the discrepancy between the values of the rotation angles of the centres of mass is 9%; therefore, the mathematical model of the dynamics of the SMTS may be considered adequate.