OPERATIONAL RELIABILITY EVALUATION OF RAILWAY INFRASTRUCTURE USING METHODS DISCRETE EVENT SIMULATION

Abstract

The purpose of the work is to review and compare the existing paradigms of simulation modeling, as well as to choose the appropriate method of modeling the technological processes of rail transport systems to assess the operational reliability of its infrastructure. Results. The article highlights the main problems with the functioning of Ukrainian rail transport, which reduce its operational reliability. To solve the problem of obtaining an adequate assessment of the operational reliability of railway systems, it is proposed to use a simulation method. At present, three independent paradigms have emerged in simulation modeling – system dynamics, agent modeling, and discrete event modeling. These paradigms correspond to different levels of abstraction when creating a model, which requires the use of one or another approach. The paper describes the comparative characteristics of simulation approaches, their advantages and disadvantages. The origin history, implementation tools, features and scope of each simulation approach are considered. The expediency of modeling of dynamic processes on railway transport by discrete-event simulation is substantiated. The method and algorithms of formalization in the simulation model of the shunting work of a railway station are considered. The station model was created in the AnyLogic simulation environment and allows to evaluate the operational reliability of a railway station based on the magnitude of delays and downtime of rolling stock at the station due to the occupancy of tracks and locomotives. The practical significance of the work performed is to be able to more rationally approach the approach of modeling the work of different systems in solving problems related to obtaining a reliable estimate of their technical and technological parameters and operational reliability.