Proceedings of Petersburg Transport University最新文献

{"title":"A Model of the Process of Information Exchange Between Subscribers of the PRC Network with a Common Communication Channel","authors":"Andrey Privalov, Elena Kazakevich, Ivan Gluhov","doi":"10.20295/1815-588x-2023-4-921-930","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-4-921-930","url":null,"abstract":"Purose: To analyse the quality of operation of the PRC network, enabling the evaluation of time of guaranteed delivery of data packets to the subscribers of the network in bad radio-electronic conditions. Methods: To address the problem, methods from the general theory of systems, probability theory, queuing theory, as well as the method of topological transformation of stochastic networks (TTSN) have been used. Results: The developed model allows us to estimate the quality of functioning of the packet radio communications network, which allows us to determine the main directions to improve the interference immunity of PRC networks from the effects of random and intentional interference. Practical significance: The obtained results can be used in the design of mobile radio networks of the ALE standard, as well as in the development of methods to improve the interference immunity of radio networks, multi-parameter adaptation systems.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"355 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prospective Applying of a Switched Reluctance Motor in the Traction System of a High-Speed Electric Train","authors":"E. Miroshnichenko","doi":"10.20295/1815-588x-2023-4-1004-1015","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-4-1004-1015","url":null,"abstract":"Purpose: The use of switched reluctance motor (SRM) in the traction system of a high-speed electric train by increasing the performance of its bearings. Using SRM as a traction electric motor, the machine-building complex can solve problems related to the import substitution of components for rolling stock. Methods: The main reasons for the wear of the bearing assembly are the forces of one-way magnetic attraction (OMA). These forces occur when the air gap is asymmetric due to errors in the manufacture of parts and deviations in the assembly of the electrical machine. The OMA forces at a certain displacement are determined using the Maxwell stress tensor. To achieve this, the finite element method embodied in the FEMM program has been used. The dependences of the currents in the corresponding phases on the moment of time required to find the forces have been obtained using the MATLAB program (SIMULINK). Results: Calculation and analysis of OMA forces is carried out at various variants of rotor displacement relative to the axis of symmetry of the stator, including at vertical shift in the direction of gravity action. Calculations have shown that OMA forces can reach significant values. A proposal has been put forward to limit the magnitude of the OMA force to the magnitude of the force at the maximum permissible residual unbalance. Methods are proposed to eliminate irregularity of the air gap at the stage of production. Practical significance: The results of the studies can be used by the developers in the design of the traction SRM, the selection of the structural value of the gap and the assignment of tolerances in its dimensional chain. The use of SRM with a long life of bearings in the traction drive system will create the prerequisites for obtaining a new competitive rolling stock.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"26 3‐4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Basic Calculated Hydrological Characteristics of Surface Runoff Treatment Systems in the North-Western Region of Russia","authors":"Yuriy Kanciber, A. Ponomarev, V. Shtykov","doi":"10.20295/1815-588x-2023-4-801-810","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-4-801-810","url":null,"abstract":"Purpose: The normative and methodological documents in Russia regarding the treatment of surface runoff from residential areas do not provide explanations on the effectiveness of the treatment system from the point of view of the possibility of pollution of water bodies they allow. The probability of pollution and the dilution ratio of untreated wastewater have not been studied. The goal is to develop a method for determining the hydrological characteristics of the runoff necessary for the probabilistic assessment of dilution factors, permissible concentrations and discharges of contaminated surface waters. Methods: Based on observational data from fourteen weather stations in the North-West of Russia, the probabilistic relationship between the characteristics of runoff from built-up areas and the receiving river has been studied, taking into account the basics of probability theory and hydrological calculations of minimum runoff. Calculations have been carried out and the dependence of the number of days with precipitation and their relative amount in the warm period of the year on the maximum daily precipitation layer has been established. A mathematical relationship has been found between the frequency of rain and the number of possible cases of pollution of a water body. Results: A method has been developed for calculating the probable values of precipitation characteristics, minimum water runoff in the receiving river and the dilution factor of pollutants depending on the permissible frequency of negative consequences from river water pollution and the correlation coefficient of the probability of minimum water flow from built-up areas and in the receiving river. Practical significance: The method for calculating the hydrological characteristics of runoff will make it possible to more reasonably and accurately determine the required degree of wastewater treatment, the productivity and parameters of treatment facilities, and in some cases, to reduce the degree of pollution of watercourses.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"323 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Results of Mixed Convection Modeling to Assess the Feasibility of Using Jet Heaters by the Heating of Locomotive Depot Welding Stations","authors":"Igor' Kiselev, Mihail Kudrin, Sergey Komissarov, Dmitriy Monastyrskiy","doi":"10.20295/1815-588x-2023-4-891-901","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-4-891-901","url":null,"abstract":"Purpose: Numerical investigation of mixed convection processes to assess the feasibility of using jet heaters for local heating in locomotive depot welding stations with a mechanical localized ventilation system. Methods: The research has been conducted using the finite difference method in the COMSOL Multiphysics software, with the problem of mixed convection formulated and the calculation domain reduced to a two-dimensional plane. Results: Temperature fields and velocity maps have been obtained for the workstations under various conditions and positions of the jet heater. The analysis of the results has allowed us to propose options for using jet heaters and their installation locations, as well as to refine the impact of their impact on the microclimate of the workstation. The conditions under which the use of jet heaters is both practical and safe have been determined. Practical significance: The results obtained during the study can be used for the organization or optimization of local heating systems for welding stations in locomotive depots, as well as for similar workplace arrangements.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"2 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"To Matters of Heptyl Transportation by Rail","authors":"Nikita Lapshin, Vladislav Milen'kih, Stella Dul'neva, Evgeniy Asmankin, Tat'yana Sil'yanova","doi":"10.20295/1815-588x-2023-4-835-842","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-4-835-842","url":null,"abstract":"Purpose: To estimate the properties of heptyl and its effect on the human body and the environment. To provide an overview of the sphere of heptyl application and the features of its transportation by rail. To consider the structural features of the model 15-629 tank car and to perform a calculation to select the optimal crosssectional area for the inlet opening of the relief valve to enhance safety during the transportation of heptyl by the model 15-629 tank car. Methods: To calculate the inner and outer surface areas of the tank shell using the technical characteristics of the six-axis multi-unit tank-car of model 15-629. Next, we will calculate the mass air flow rate through the inlet relief valve and determine the heat transfer occurring due to the external heat dissipation from the tank shell into the surrounding environment. These data are necessary to estimate the equivalent diameter of the inlet relief valve orifice. Results: Thanks to the calculations performed, a more suitable diameter of the inlet safety valve orifice has been determined. This will ensure a safer transportation of highly toxic liquid rocket fuel components used in both Russian launch vehicles (“Kosmos”, “Cyclone”, “Proton”) and international ones (such as American “Titan” rockets, French launch vehicles of the “Ariane”, Chinese rockets of the “Long March” family, and others). Practical significance: Hydrazine-based propellants are more energy-efficient compared to hydrocarbon-based propellants, which has led to an increased usage of Unsymmetrical Dimethylhydrazine (UDMH) in recent years. Due to the rapid growth of space industry, the volume of heptyl transportation by railway has been increasing. In order to prevent technological disasters, calculations have been conducted to determine the diameter of the inlet relief valve to minimize depressurization of the tank car, regardless of temperature conditions.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"7 5‐6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Analysis of Transport Demand and Offer in Models of Transport Systems of Urban Agglomerations","authors":"L. Losin, N. Bulycheva","doi":"10.20295/1815-588x-2023-4-943-953","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-4-943-953","url":null,"abstract":"Purpose: To analyze the methods of mathematical modeling used to determine the demand for urban transportation and predict the intensity of flow distribution in the public transport network. To determine the zones of effective use of network and pre-network methods for the formation of transport models of urban agglomerations. To conduct a comparative analysis of the parameters of transport demand and offer in the network and pre-network variants of urban transport systems modeling. Methods: Mathematical modeling, processing large amounts of data, geoinformation analysis. Results: The methods of determining transport demand and offer used in modern transport models are analyzed. A comparative analysis of pre-network and network methods in transport modeling is carried out, the zone of their effective use is defined. The approbation of the problem solution of determining the transport demand and offer is carried out on the example of the urban transport system model of the St.Petersburg agglomeration. Based on the modeling results, the dependencies of transport demand and offer on the input data and model limitations are analyzed. It is concluded that it is necessary to calibrate the value of each parameter when using transport modeling. Practical significance: The results obtained can be the basis for improving mathematical modeling methods used in urban transport planning. The proposed approaches to modeling transport demand and offer can be used in the creation of forecast models used to justify project decisions in the documentation of territorial and transport planning.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"23 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural-Technological Aspect of Erection of Steel Reinforced Concrete Span Structure of the Road Bridge Over the Vetluga River","authors":"Yuriy Zuev, Sergey Chizhov, Yuliya Avdey, Anatoliy Antonyuk","doi":"10.20295/1815-588x-2023-4-931-942","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-4-931-942","url":null,"abstract":"Purpose: To consider structural and technological aspects of construction of steel reinforced concrete span of road bridge over the Vetluga River. To consider the issues of creating a computational model in the Midas Civil program complex with regard to the presented requirements to meet the requirements of GOST and SP. To give a detailed analysis of the stress-strain state of the model on the basis of calculation of the created model. Methods: Analysis of the design and allocation of the main parameters; comparison of the calculation models obtained taking into account the stage of concreting of the monolithic reinforced concrete slab of the roadway and without taking into account the stage of work. Results: The stress-strain state has been analyzed, and the structural and technological features of the erection of a road bridge over the Vetluga River have been considered. It is established that stresses in metal main girders increase significantly in comparison with the model that does not take into account the stages of erection. The combined operation of steel and reinforced concrete section starts only after the monolithic reinforced concrete slab of the roadway has gained strength. It is established that the development of cracks in concrete in the support zones caused by negative moments can be accounted for by reducing the elastic modulus of concrete in the support zones by 8 times. The change of stresses and strains in the structure by stages has been analyzed. The stresses and deformations arising in the structure during its erection are \"inherited\" from one stage to another when calculating by stages. Practical signifacance: The methods of creating a reliable calculation model of steel-reinforced concrete spans, reflecting the actual nature of the work of the structure both at the stage of construction and at the stage of operation, are shown. The methods described in the article can be recommended for creating a calculation model in the Midas Civil software package with consideration of the presented requirements to meet the requirements of GOST and SP, as well as to avoid accidents at all stages of the life cycle of the structure.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"21 47","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Another Mystery of the Big Chain Bridge, or Qui est le Capitaine Brun?","authors":"Anna Leyerman","doi":"10.20295/1815-588x-2023-4-791-800","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-4-791-800","url":null,"abstract":"Purpose: To uncover new data related to the history of the Institute of Railway Engineers during the 1820s–1830s, exploring the biographical aspect of the history of the model workshop at the Institute of Railway Engineers through the little-known facts of the biography of Egor (Georgy) Frantsevich Brun, who was in charge of the workshop of the institute since 1829. Methods: The collection and analysis of historical data using published publications, reference literature, archival sources and the museum fund. Results: The precise date of the arrival of the model of the Egyptian chain bridge at the Institute of Railway Engineers has been established. The authorship of one of the oldest models in the exposition of the Central Museum of Railway Transport of the Russian Federation has been identified, which vividly demonstrates the construction of the first metal chain bridges and reflects the beginning of the development of new directions in bridge construction in Russia in the 19th century. The biography of the engineer E.F. Brun during the 1820s–1830s has been reconstructed. Practical significance: The materials are published for the first time and can be useful both for further research by specialists in the history of the first transport university of Russia, and for a wide range of interested readers.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"326 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138966713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Basic Methodology for Selecting and Substantiating Iraqi Urban Public Transport Modes","authors":"E. Dudkin, Husam Abbas Mohsin Abuzhvaid","doi":"10.20295/1815-588x-2023-2-314-324","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-2-314-324","url":null,"abstract":"Purpose: Improving the urban public transport (UPT) system to ensure its efficient operation in Iraqi cities. Choice and justification of the urban transport mode in Najaf (Iraq), which will improve safety and speed of movement of passengers. Justification of the application areas for different types of transport in Iraqi cities by optimizing and selecting modes of passenger transport based on traffic volume, passenger density and urban characteristics. Methods: Statistical processing, functional analysis, mathematical modelling, probability theory, analysis of urban passenger transport in Iraqi cities, classifying Iraqi cities by main characteristics: population density, area, level of motorization, the maximum length of the territory, analysis of passenger traffic intensity and average capacity of the rolling stock. Results: New boundaries of average passenger flow density intervals have been adjusted for groups of Iraqi cities, allowing for the selection of the type of UPT and its share of transportation for each type of rolling stock. A distribution of urban transport modes has been proposed, taking into account the characteristics of Iraqi cities according to their classification. Practical significance: The application of the developed proposals and activities allows: to justify and select the types of urban transport systems for the city of Najaf; to calculate passenger traffic on six different routes with maximum traffic for the city of Najaf; to determine the classification of rolling stock capacity series and the UPT options for Iraqi cities; to provide recommendations for the development of the transport network of Iraqi cities. The proposed distribution of urban transport modes improves public transport services and the quality of use of each mode of transport.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129723766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prospective Development of New Service Offerings in the Urban Traffic Flow","authors":"N. Slobodchikov, A. Dergachev, O. Kuranova","doi":"10.20295/1815-588x-2023-2-279-289","DOIUrl":"https://doi.org/10.20295/1815-588x-2023-2-279-289","url":null,"abstract":"Purpose: One of the possible solutions to the problem of congestion of the road network in conditions of a high level of motorization of cities is considered. Methods: The concept of the service “Mobility as a service” as one of the progressive methods of urban traffic management is described. The technologies that allow this service to work, while increasing the efficiency of the use of vehicles, are considered. Results: The analysis of carsharing, kicksharing and bikesharing services as a “first and last mile” transport system was carried out. Practical significance: The solution to this problem can be the integration of all existing transport systems into a single system that can have a greater impact on the efficiency of mobility of urban users.","PeriodicalId":273874,"journal":{"name":"Proceedings of Petersburg Transport University","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126375224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}