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BACKGROUND: During the operation of crane beams of lifting equipment of subway tunnel escalators machine halls, the information about the technical condition of certain structural elements of supporting metal framework is always relevant, which determines the possibility of their further safe use and the need for repair and restoration work. The value of the remained service life is estimated by comparing the actual load-carrying ability with the criteria corresponding to the limiting conditions according to the project documentation. The actual state of the supporting framework elements can change with time significantly, therefore, the assessment of the remained service life is carried out with an experiment-and-simulation method based on the determination of stresses and their maximum deviations in weakest sections of framework elements with the determination of the degree of their impact on durability in the long term. AIMS: Analysis of the combined application of methods for modeling the stress-strain state with subsequent wavelet analysis of wave processes in the interlocked stud-bolts of the suspension unit of riding beams of lifting and transport equipment of subway tunnel escalators machine halls. METHODS: With regard to the specific features of the design, numerical simulation of the technical state of the interlocked sections of the stud-bolted suspension of crane beams of lifting equipment of subway tunnel escalators machine halls is considered in this work. The capabilities of the Simulation (static analysis using the finite element method) and Motion (kinematic and dynamic research with formation of systems of differential equations of motion and subsequent solving) modules of the SolidWorks software platform were used in the development of the model. RESULTS: As a result of the carried out research, with regard to the specific features of various methods of the stress-strain state simulation, a spatial linear dynamic model has been developed that reflects the processes occurring during the deformation of the stud-bolt suspension of the supporting I-beam, which is helpful for an objective assessment of its technical state, as well as the possibility and conditions of further operation. CONCLUSIONS: To simulate the stress-strain state, the combined application of methods is necessary, followed by a wavelet analysis of wave processes, which increases the reliability of diagnostic procedures and, consequently, makes it possible to make reasonable decisions about the further operation of the facility.

BACKGROUND: An essential condition of existence for enterprises of all forms in the face of rapid external and internal transformations is digital reformation of their business processes. The Saint Petersburg subway is no exception, which has an aging fleet of escalators, for which the introduction of digital technologies, accompanied by the optimization of the control system for the main technological processes, can provide a balance between ever-increasing costs and limited, not always rhythmically flowing supplies. AIMS: To establish one of the possible options for the software architecture for planning and monitoring maintenance and repair of the subway escalator fleet. At the same time, the object of research in the study is the subway escalator fleet, and the subject is automation of the maintenance and repair system. METHODS: Analysis of modern architectural solutions used in the design of software (materials), and the synthesis on their basis of a microservice architecture implemented by tools taken from the field of machine learning and artificial intelligence are the methods used in this study. RESULTS: A significant result of the work for practical application is the proposed scheme of the two-circuit IT landscape of the information system and the block diagram of the software implementing the internal processing circuit. The proposed version of the software is intended for regular use as a tool for monitoring and controlling the register of management objects (works) that create and do not create value for the company (providing/not providing transportation of passenger traffic). At the same time, the implementation of the proposed circuit design solution can be carried out using ready-to-use and free software components, significantly reducing the design time and the cost of its creation and operation. CONCLUSIONS: The results obtained may be one of the options for implementing the concept of digital transformation of the maintenance and repair system of the subway escalator fleet.