RESULTS OF MULTIVARIATE EXPERIMENT TO DETERMINE DEPENDENCE OF THE MAXIMUM PRESSURE OF TRACTOR WHEELS ON THE SOIL FROM TRACTOR’S PARAMETERS AND PHYSICAL AND MECHANICAL PROPERTIES OF SOIL. ANALYSIS OF THE EQUATIONS

During statistical processing of proceeding of several variants of experiments the equation of maximum pressure of tractor wheels on the soil were obtained, depending on the tractor parameters and physical and mechanical properties of the soil. This paper analyzes the influence of the main factors on the maximum amount of wheels pressure on the ground. We revealed performance of equations beyond the experimental values of the factors. With an increase in the width of the wheel profile, its diameter, the speed of the tractor, the maximum pressure of wheel on the ground is reduced, and with increasing tractor’s weight on one wheel, the soil hardness, the pressure in wheel tire the maximum pressure of wheel on ground increases. Comparison with the data, available in the domestic and foreign journals, showed that the most stable prediction results of maximum pressure value of tractor wheels on the ground are obtained by using the first equation in the article. The prediction error of wheels maximum pressure values is in the range of 3 to 15%, depending on the brand of tractor and its working conditions.