AN EXPERIMENTAL ESTIMATION OF THE SMOOTHNESS OF MOVEMENT OF A SELF-PROPELLED FORAGE HARVESTER

Modern forage harvesters (FH) refer to the most loaded types of self-propelled vehicles, which is due to their layout peculiar features and the operating conditions. In this connection, the development of technical solutions to increase the FH smoothness of movement is an actual task of modern manufacture of combine harvesters, while the basis for creating such means is to determine the level of the existing loads on the frame of the vehicles under consideration in the process of their motion. The paper presents the results of experimental studies of the dynamic loads assessment and smoothness of movement parameters of a self-propelled FH when it moves along ground and asphalt-concrete coated roads at various speeds. The measurement procedure has been described including the motion conditions and the used measuring equipment. The implementation of effort and vibration acceleration in various parts of the combine was presented, their analysis was carried out, and the conditions for the emergence of critical loads on the frame of the self-propelled combine were identified, resulting in the detachment of the wheels from the supporting surface and significant acceleration of the skid and adapter of the self-propelled vehicle. The results of spectral analysis based on the obtained experimental data were presented. The main harmonics and characteristic spectra were identified on the basis of amplitude-frequency characteristics of vibration acceleration in such parts of a FH as the bridge of the driven wheels, the bridge of driving wheels and the adapter. It was shown that the spectra were concentrated in the low-frequency region, the boundaries of which were limited by the frequency of the body’s own oscillations on the pneumatic tires and the adapter on the suspension through the source of power. On the basis of the experimental data obtained, the relationship between the layout and the peculiar oscillations features of the FH was determined as well as the directions for further scientific research to improve the smooth running and reduce the dynamic loads on the self-propelled agricultural machinery.

forage harvester, oscillations, smoothness of movement, vibration acceleration, reaction of supporting surface, layout features

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