Development of system for stabilizing movement of power unit with rear mounted mower

Abstract

The article is devoted to solving the problems of increasing the stability of motion of a power unit with a rear mounted mower. An analytical review of methods and means of ensuring the stability of the header movement of the power unit is given. Variational principles of mechanics are applied in the study of the dynamics of motion of a power unit. The regularity of the oscillatory angular displacement of the unit relative to the power unit has been established. An automated system is proposed for ensuring the stability of the movement of a power unit with a rear mounted mower. This system can be developed on the basis of the synthesis of mechanical and hydraulic subsystems with the activation of the drive to the field wheel. Equation describing the transmission ratio provides efficient automatic torque control on the field wheel of the implement. A decrease in the coefficient reduces the response of the system to external disturbances from resistance forces and unit deflection, while an increase can lead to an undesirable oscillatory mode of operation. It was found that the trajectories of movement of both serial and experimental units are characterized by the presence of constant components of deviations. According to Student's criteria, the introduction of an active drive to the field wheel reduces the trend value from 7.36 to 5.31. It has been substantiated that the active drive on the field wheel of the unit stabilizes the movement of the power unit. The root mean square deviation of the trajectory of movement decreases from 4.9 cm to 4.4 cm, and the angle of deviation of the trajectory from the straight-line decreases on average by 10°. According to the results of testing the experimental power unit using an active drive on the field wheel of the unit, it increases the productivity by 6% with a decrease in the fuel consumption of about 9%.

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“…The following are known among the solutions aimed at eliminating the above disadvantages: The header having an additional spring-loaded cable that keeps it from turning clockwise. Other researchers have equipped the right support wheel of the trailed header with an active hydraulic drive [6,7]. The speed of its rotation is set such that the header deviation angle from the direction of movement is constantly in the zone close to zero.…”