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
Abstract and keywords
Abstract (English):
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.

Keywords:
wheel pressure on the ground, tractor’s parameters, soil hardness, soil density, the diameter of the wheel, the width of a tire, a load on wheel, pressure in tire, the regression equation.
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Анализ полученных уравнений. Для выявления работоспособности полученного уравнения (1) проведем расчеты при изменении основных факторов в пределах их возможного  варьирования. Результаты расчетов с использованием СКМ МАТЛАБ приведены на рисунках 1 - 5.

Исходные данные для расчета:

D=1.6 м; pw=1.0*105 Н/м2; H=15*105 Н/м2; ρп=1300 кг/м3.

Как видно из рисунка 1, максимальное давление колеса на почву находится в линейной зависимости от ширины профиля колеса и нелинейной зависимости от массы трактора, приходящейся на одно колесо. Причем, с ростом ширины профиля колеса – максимальное давление колеса на почву уменьшается, а с ростом массы, приходящейся на одно колесо, увеличивается.

Рисунок 2 показывает, что максимальное давление колеса на почву находится в нелинейной зависимости и от диаметра колеса и от массы трактора, приходящейся на одно колесо. Причем с ростом массы трактора, приходящейся на одно колесо, максимальное давление колеса на почву растет и растет тем интенсивнее, чем больше диаметр колеса.

 

References

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