Abstract
The intensification of agricultural production under modern conditions implies the use of super-powerful mobile technical means, which leads to an increase in the levels of technogenic impact on soil and, consequently, deteriorates its fertility. Therefore, the most acute issue related to current agricultural production is aimed at resolving the task on improving the operational indicators of wheeled running systems of mobile technical means. This necessitates an analytical study into the processes of soil deformation under the elastic motors of mobile wheeled agricultural machinery. We have proposed a procedure of the graph-analytical step-by-step modeling of the process of soil deformation under pneumatic tires of mobile agricultural equipment taking into consideration the changing shape of an elastic tire sheath. Using appropriate graphic models makes it possible to explore, in stages, the process of soil compaction inside the profile of the track it formed. It has been found that in the contact area «deformed soil – the surface of an elastic wheeled mover of the mobile vehicle» the highest level of compaction is observed in the soil layer, which is directly in contact with the elastic mover. The depth of the recompacted soil layer on the «track bottom» depends on the dimensions of a tire of the wheeled mover and does not exceed the value of 0.075 width of the tire. The highest soil compaction level is observed in the area directly adjacent to the gauge. It has been established that the most dangerous design of a pneumatic tire, in terms of soil overcompaction in the track, is the shape of an elastic tire sheath that is described by the curve of the Cassini oval with four points of inflection. We have outlined distinctive features of recommendations to determine the operational values of tire working pressure depending on specific physical-mechanical and agro-technological properties of soil and the character of performed technological operations
Highlights
The most characteristic feature of intensification of agricultural production under modern conditions is the stable acceleration of energy saturation of technological processes in plant growing, which predetermines the use of super po werful mobile technical means, whose mass per unit will grow further
The resulting graphic models were constructed based on the changing shape of the elastic sheath of an ovaloid of equal pressure
That meets the condition for its «fold-free» character, and makes it possible to study, in stages, the process of soil compaction, including in the profile of the formed track
Summary
Doctor of Technical Sciences, Professor, Head of Department Department of Tractors, Cars and Bioenergosistem** S. Doctor of Technical Sciences, Professor, Head of Department Department of Mechanics and Agroecosystems Engineering***. V. Chuba PhD, Assistant Professor Department of Transport Technologies and Means in AIC**
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