The regulation of the stress-strain state of the floor slab is considered in order to choose the optimal design solution for the frame of a unique building. Three variants of design solutions with varying reinforcement of the plate and cross sections of the vertical elements of the frame are proposed. The numerical experiment was performed by the finite element method using the Lira-CAD software package. To improve the accuracy of the results obtained, calculations were made taking into account the nonlinear operation of materials. The computational model of the floor slab includes physically nonlinear shell finite elements. Nonlinear loading was modeled taking into account the creep of concrete. Based on the results of the calculations, the analysis of the deflections of the floor slab and the consumption of materials was performed. The numerical experiment allowed us to propose an optimal design solution for the frame of a unique building.

Keywords: stress-strain state, finite element method, unique building, physical nonlinearity, deformation law, building frame

Considers issues related to software modeling is an important part in the implementation of the diagnostic system in an existing petrochemical complex. Considered the most popular types of software modeling. The article focuses on the analytical review of software modeling methods, advantages and disadvantages. The stages of software modeling are shown. Using the example of studying the software of the vibration diagnostics system of a gas pumping unit, it is shown the advantage of applying the methods of studying a dynamic discrete system with random delays using a mathematical apparatus that describes a stochastic Petri net and a Markov chain.

Keywords: technical diagnostics, petrochemical complex, gas pumping unit, automatic control system, simulation, dynamic discrete system with random delays, software, stochastic Petri net, Markov chain, statistical characteristics

The intensification of petrochemical production imposes serious requirements on the operation of all automated production systems. The increase in the degree of automation leads to an increase in the level of aberration of the automated process control system and the entire production as a whole. The use of poorly populated technologies, minimizing the presence and participation of maintenance personnel in the operation of facilities, is achievable only with the use of monitoring and diagnostic systems for the technical condition of equipment and automation equipment.

Keywords: statistical research, technical diagnostics, diagnosis, differentiation of scientific research in the field of technical diagnostics, decision making, fuzzy logic, neural network, predictive model, uncertainty

The most popular types of statistical analysis are considered. The article focuses on the analytical review of statistical methods, advantages and disadvantages. The stages of a statistical survey of a technological object are shown. Using the example of studying the mechanical part of a gas pumping unit, the advantage of using statistical methods is shown.

Keywords: statistical analysis, technical diagnostics, petrochemical complex, gas pumping unit, distribution, minimum risk method, minimum error method, minimax method, Neumann – Pearson method, maximum likelihood method