Modern methods of determining the parameters of the tool do not take into account all the features of deep loosening, first of all, such important indicators of the quality of soil decompression as the degree of crumbling and the configuration of the loosening zone. Therefore, the search for a solution to the problem of assessing the quality of soil decompression at the design stage, depending on the parameters of the working bodies of the deep miner and the specified physical and mechanical characteristics of the soil is an urgent task. The aim of the work is to develop an algorithm for assessing the influence of the parameters of the upper reformers on the quality of crumbling and the loosening zone based on modern mathematical and simulation modeling technologies. This is achieved by developing a method for determining the parameters of the loosening elements of the deep miner on the basis of modeling the processes of interaction of loosening elements with the soil, taking into account factors that determine the quality of decompression and the energy intensity of the decompression process of the cultivated soil.

Keywords: mathematical modeling, deep loosening, soil loosening elements, calculation algorithm, degree of crumbling

Intensive use of heavy energy-rich machinery on agricultural land has resulted in a significant overconsolidation of tillable land. It is obvious that overconsolidation of soils is one of the main reasons for reducing crop yields. This is especially evident on slope lands, which are exposed to many additional factors of degradation (deflation, surface washoff, destructuring, sliding of the topsoil to the slope bottom with the formation of swampy areas) resulting in a loss of yield of up to 12-15%. The peculiarities of slope lands place increased demands on the corresponding work technologies. However, existing tillage equipment cannot fully and qualitatively fulfill these demands. In this regard, the search for a rational solution to this problem based on the methodology of conceptual design is an urgent task. The system functioning is influenced by many external factors, such as the forms of organization of economic entities and their respective resource capabilities, the variety of cultivated fields by area, type of soil, crops, profile shape, climatic conditions, ecology, etc. Obviously, under these conditions, the solution to the problem of creating a slope land cultivation system (SLCS) at the modern level lies in the field of new information technologies that implement the idea of the entire life cycle integrity. However, the SLCS system does not exist in isolation. It interacts both with the land user and the cultivated soil. At that, the interaction is limited not only by the soil condition and the slope angle, but also by the profitability level, financial and technological capabilities, as well as environmental safety. In UML, the corresponding semantics are reflected in an additional set of dynamic diagrams. Use options or use case diagrams play a major role in modeling the behavior of a system, a subsystem, or a class. The use case diagram allows not only to formalize the relationship of functional requirements in the form of goals initiated by specific participants in the process of creating a SLCS system by a customer (land user), an ecologist and an economist, but also to develop, on the basis of a compromise and taking into account financial and technological constraints, various use cases that implement the global goal - "Increasing the efficiency of the SLCS functioning".

Keywords: concept design, deep tiller, universal modeling language, use options, use case diagram

The quantitative methods of risk assessment of technological processes of manufacture and the analysis of level of deficiency of products in the conditions of nondeterministic stochastic parameters are considered. The properties defining reliability of process are its controllability, stability and reproducibility. The main methodical device by assessment and the analysis of these properties are provisions of standards on statistical methods of quality control. In the analysis and assessment of risk it is necessary to consider that borders of a tolerance zone of parameters of products and control limits of reliability of technological processes of its production are always considered as acceptable (admissible) risk levels. Overcoming these levels is considered a negative consequence in the form of increase in level of deficiency of products and decrease in accuracy of technological processes of its production. Technical solutions are always bound to risk as it is never impossible to be sure of the end estimated result in advance. To check whether this risk was justified, it is possible always only after realization of technical solution and approach of an undesirable event. Therefore technical activity in principle can't be completely free from any risk, and it is always necessary to go on necessary and justified risk consciously.

Keywords: technical system, technological process, risk, indeterminacy, management of reliability, negative event, damage, nondeterministic stochastic parameter