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COMPARING APPROACHES OF CALCULATING SOIL PRESSURE OF FORESTRY MACHINES

Egor Khitrov

Abstract

The aim of the article is studying relationships of soil pressure of forestry machines, determined within different methods. Research methods include computing experiment and calculated data processing. The article analyzes three different methods for calculating the soil pressure, including analytical method for calculating average contact pressure, method for calculating the pressure on a rigid surface, and nominal ground pressure method. Basing on the computing experiment results, the study establishes linear relationships between the pressure numeric within the three methods. Values of coefficients of the linear functions are determined according the rover parameters (wheel width and wheel diameter, tire pressure, wheel load) and mechanical properties of the soil. In particular, processing of the calculated data shows that nominal ground pressure on bearing soil is lower in its value than pressure of the same rover on rigid surface; the difference is in range of 40-50 kPa. Furthermore, analytical average pressure is close in value to the nominal pressure in cases where the wheel load is in range of 10?20 kN; at higher values of the load, the average pressure is approximately twice less in value than the nominal ground pressure. In particular, processing of the calculated data shows that nominal ground pressure is lower in its value than pressure of the same rover on rigid surface; the difference is in range of 40-50 kPa. Furthermore, analytical average pressure is close in value to the nominal pressure in cases where the wheel load is in range of 10?20 kN; at higher values of the load, the average pressure is approximately twice less in value than the nominal ground pressure.

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