Ph.D. S. Nurushev

Kostanai state University A.Baitursynov .

MATHEMATICAL MODEL OF SURFACE TREATMENT OF SOLONETZ SOILS BY COMBINED MILLING TOOL.

Currently used serial tools for surface treatment of solonetz soils are not so effective. We found out that the efficiency of the combined operation of the milling tools with ripping - rotary working bodies comprising successive located mattock legs, milling drum and roller , conducted research on the justification parameters and modes of operation of the body on the surface treatment of solonetz soils .

For experimental study was made installation allows you to change parameters and modes of operation .

To investigate the influence of parameters and modes of operation of the combined milling body on agronomic performance and energy has been implemented according to plan four factor experiment Hartley 2^K-1.

As input variables ( factors ) are usually the number of active working bodies (X₁), the distance between the disks (X₂) , the milling drum speed (X₃) and the speed of movement of the body ( X₄ ) .

Optimization criterion adopted for the content of erosion- dangerous particles , the degree of crumbling above solonetz horizon and energy intensity of tillage . Experiments were carried out on cultivated middle loam solonetzes employed under permanent herbs, with a hardness of soil layer 0… 0,20 m 3,8 MPa and 14.9% moisture . Average working depth equals 0,15 m. According to the plan of the experiment , conducted 17 experiments in triplicate . To eliminate systematic errors of the order of the experiments was on a table of random numbers.

Checking equally accurate measurements carried out by Cochran , confirmed at a significance level equal to 0,05, G _max . <G _Table . Coefficient of regression equation calculated by formulas for the plan Hartley 2K type '* were evaluated for statistical significance by Student t-test . After exclusion of irrelevant and clarify significant coefficients were obtained by the regression equation describing the optimization criteria :

Ŷ₁ - degree of crumbling ;

Ŷ₂ - degree content erosion dangerous particles ;

Ŷ₃ - the specific energy .

Ŷ₁ = 87,34 + 3,44Х₁ + 6,05Х₃ - 8,52Х₄ + 7,03Х₂ Х₄ - 8,30 X₃² - 8,39 X₄²;

Ŷ₂ = 22,17 + 7,94X₁ -5,69 Х₂ + 7,12 Х₃- 1,27 X₁ Х₂-2,35 X₁ Х₃ - 1,70 X₁ Х₄ + 11,03 Х₃ Х₄ + 7,02 X₁² + 4,88 X₂² - 5,75 X₄²;

Ŷ₃ = 130,15 + 11,74 X₁ + 26,7 Х₃ - 28,85 Х₄- 14,23 X₁ Х₂ - 3,84 X₁X₃ - 3,34 X₁ Х₄ + 20,96 Х₂Х₃ + 42,75 X₁² - 15,89 X₂² -7,81 X₃²-29,7 X₄².

The resulting regression equation tested for adequacy, i.e for compliance with the experimental data obtained in the planned experiment by Fisher.

The evaluation results show that the condition of adequacy is performed (F calc . <F tab.) And the resulting regression equation adequately describe the process. Of equations that the greatest influence on the degree of crumbling and energy density have a number of active working bodies , the milling drum speed and movement speed . Contents of erosion -prone soil particles depends largely on the number of active working bodies , the distance between the disks and speed milling drum .

Thus , studies obtained mathematical models to study the dependence of quality and energy performance of the milling body on its parameters and modes of operation and used to find the optimum.