THE INFLUENCE OF VIBRATIONS OF STRUCTURAL ELEMENTS OF A DYNAMIC SOIL TILLING WORKING TOOL ON THE BASIC CHARACTERISTICS OF ITS TRACTION RESISTANCE
Investigation of surface soil tilling process by dynamic (adaptive) working tools, taking into account the relationship between the changes of traction resistance and vibration of their moving (elastic) elements, is an urgent task, as it allows to optimise their structural and technological parameters and operation modes. The study objective was to determine the influence of vibration parameters of structural elements of a dynamic soil-tilling working tool on the basic characteristics of its traction resistance. The study focused on the patterns describing the changes in the traction resistance, its irregularity degree and coefficient of variation, and the horizontal travelling distance of the extreme point of the wing depending upon the travelling speed of the dynamic soil-tilling working tool. The study subjects were the practice of ploughless surface soil tillage and a dynamic soil-tilling working tool. In the study, the methods of mathematical modelling, experimental research, and resulting data analysis and integration were applied. The scientific novelty of the work was manifested in empirical dependencies to determine the average value, the unevenness degree and the variation coefficient and the travelling distance of the wing extreme point in the horizontal plane from the travelling speed of a dynamic soil-tilling working tool. The changes in the travelling speed of a dynamic soil-tilling working tool were found to affect the average value, the degree of unevenness and the coefficient of variation of traction resistance as well as on the travelling distance of the wing extreme point in the horizontal plane. In the range of the travelling speed from 1.944 to 3.611 m/s, the degree of unevenness of the traction resistance of the dynamic working tool varied between 1.41 - 2.08, and the degree of unevenness of the travelling distance of the wing extreme point in the horizontal plane varied within 2. 58-3.19. The established empirical dependencies are acceptable for predicting the average value, the variation coefficient and the unevenness degree of the traction resistance, the variation coefficient and the unevenness degree of the traveling distance of the wing extreme point in the horizontal plane.