Contacts

A.V. Shevchenko. Development of the Architecture of a Unified Digital Platform for Integrating Telematics Data of Autonomous Refrigerated Wagons with Russian Railways Corporate Systems Based on Industrial Internet of Things and Blockchain Technologies [more] [back]

The article is devoted to solving the urgent problem of data fragmentation during the operation of autonomous refrigerated wagons (ARVs) on the Russian Railways railway network. The key task is to develop the architecture of a single digital platform, automate the information field generated by on-board telematics systems (data on temperature, location, equipment operation parameters), and seamlessly integrate it with data from corporate automated control systems JSC Russian Railways and integration with internal systems of operational, commercial and technical accounting. Objective: to develop a unified ARV digital platform that ensures the formation of a common source of reliable data, cargo safety and reliability of ARV equipment. Materials and methods: the paper uses system analysis methods for existing solutions in telematics of refrigerated rolling stock. The imperfections of the information exchange between the systems and the formalization of the platform requirements are revealed. The principles of service-oriented architecture (SOA) were used to design the architecture of a single digital ARB platform. The concepts of the Industrial Internet of Things (IIoT) were applied to collect data from various systems, and the rules of hybrid data management (“single data layer” – Data Fabric) were applied to integrate and process this data. Results: the implementation of the proposed platform will help overcome the problems of information fragmentation and delay, optimize logistics processes, create a single source of reliable data, implement the transition to maintenance based on the actual condition and improve train safety. Practical significance: information from on-board ARV systems and from corporate automated control systems of Russian Railways comes incoherently, which requires manual data comparison and, as a result, delayed response to incidents, which leads to damage to cargo. The results of the work will significantly increase the efficiency of using the refrigerated fleet, ensure the safety of goods, reduce operating costs and strengthen the competitive position of rail transport in the market of transportation of perishable products. Keywords: autonomous refrigerated wagon, telematics, data integration, predictive analytics

D.V. Veremeev, P.A. Pegin. Selection of the Optimal Value of Cylindrical Elements in Tower Structures [more] [back]

Objective: to identify the most efficient types of cylindrical cross-sections in accordance with the criterion of minimizing the wind effect on an element by studying the graph of aerodynamic coefficients for elements of this cross-section type presented in the current regulatory documentation, taking into account the accepted parameters of surface roughness, wind pressure values, and a set of heights relative to the ground surface. Application of the research results to existing types of cylindrical cross-sections manufactured in accordance with GOST. Methods: analysis of the existing scientific and technical literature touching upon the issue of experimental studies of the aerodynamic indicators of cylindrical cross-sections. Consideration of analytical expressions for calculating the wind effect on cylindrical cross- sections with their subsequent transformation to obtain intermediate values. Approximation of the curve of the graph of aerodynamic coefficients. Results: a technique has been developed for identifying the ranges of diameters of cylindrical cross-sections located in the critical region of Reynolds numbers. A formula for determining the aerodynamic coeffi in the critical Reynolds number region was obtained by approximating the curve of the graph of aerodynamic coeffi located on the boundary of the critical and postcritical Reynolds number regions. The diff between the wind eff on various pipe diameters was identifi and the resulting graph illustrates a reduction in wind eff on larger-diameter pipes. The diff with wind eff on smaller-diameter pipes can reach 16%. Practical signifi : the possibility of using the derived method to obtain the most rational sections with a cylindrical surface shape based on the parameter of the least wind impact on the element, taking into account the accepted values of surface roughness and wind pressure, as well as the set of heights relative to the ground surface. The method allows for the development of more rational and cost-eff lattice structures for tower structures by reducing the wind impact on individual elements. Keywords: tower, round element, cylindrical section, wind effect, aerodynamic coefficient, optimal pipe sections, load, lattice elements, Reynolds number

E.V. Oparin, F.A. Proshin, E.V. Oparina. Simulation Model of the PTP Protocol Operation in E2E Mode [more] [back]

Purpose: to develop a simulation model of clock synchronization in accordance with the Precision Time Protocol (PTP) functioning in «End-to-End» (E2E) mode. To investigate the influence of probabilistictemporal parameters of network devices operation on synchronization accuracy. Methods: an analysis of foreign and Russian authors’ works and technical documentation, simulation modeling using an agentbased approach. Results: a simulation model of local time scale synchronization via PTP with transparent clock is developed. An estimation of synchronization accuracy are obtained depending on the influencing subprocesses. Theoretical significance: the developed model makes it possible to obtain the estimation of the achieved synchronization accuracy when PTP is operating in E2E mode depending on the characteristics of the devices that are used, as well as on the characteristics of the communication channels. Practical significance: the obtained results can be used for designing relatively small packet networks with PTP support that is relevant in the context of implementing industrial automation tools at enterprises. The developed models can also be used for analyzing the operability of local area networks functioning to find the most significant subprocesses that affect the provisioned to users quality of service. The model can be further scaled for implementing in networks with more complicated topology and become a basis for complex of synchronization models of PTP working in different modes. Keywords: Network synchronization, PTP, precision time protocol, E2E, frequency-time provision, time scale