Load on wheels and soil from change in vertical acceleration during motion of mobile machines

Abstract

Correct operation of tractor wheel tires is difficult and depends on many factors. Tire pressure is of great importance for the distribution of stress and strain pressure, both in the tire itself and its effect on the soil. Tire deformation affects the size of the ground contact surface. Low pressure causes excessive deflection of the tire carcass and increases the rolling resistance of the wheel. The reasons for too much pressure are a decrease in tire adhesion to the soil, uneven and rapid wear, especially of the driving wheels. For different soils, depending on the tire pressure, different soil stress distribution can be obtained. The article presents the influence of the tire of the driving wheel of the tractor during operation on the change of soil compaction.
The main goal of this study was to assess the effect of mechanical stresses acting under the influence of the driving wheels of an agricultural unit on soil compaction and the processes occurring during this. Agricultural machines can affect the structure of the soil profile down to a depth of 0.6 m, depending on the characteristics of the machines, soil type and initial soil conditions. Taking into account the change in the top layer of the soil, the running systems of agricultural units, especially tractors with mounted or trailed implements, which create tractive force due to stress-deformation - the interaction between tires and the top layer of the soil. In this contact surface interaction between soil and tire, soil deformation occurs under normal and shear stresses. Shear stress rises sharply with increasing traction and wheel slip, which can lead to destruction of the weak top fertile layer.