• Research on Key Technologies for Intelligent Operation and Maintenance of RBC System#br#
• Fang Gang
• 2024 Vol. 21 (8): 1-8. DOI:10.3969/j.issn.1673-4440.2024.08.001
• Abstract ( ) PDF (3916KB)( )
• To further improve the operation and maintenance efficiency of the Radio Block Center (RBC) system and reduce the operational risks caused by system failures, this paper considers the structure of the RBC system, and addresses the pain points in the system operation and maintenance process, to enhance the monitoring method of the RBC equipment from three aspects: server hardware interface monitoring, PRI interface monitoring at RBC side and CTC interface monitoring. Through the centralized maintenance of the RBC hardware, software and network operation status, a data warehouse is built to assist the signalling & communication maintenance personnel to quickly discover the faults, achieve intelligent fault analysis, and provide fault disposal suggestions, which can effectively improve the intelligent operation and maintenance management of RBC/TSRS center. Finally, this paper shows some typical problems solved by the proposed intelligent operation and maintenance system.
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• Research on Axle Counter System Based on Fiber Bragg Grating Sensing Technology#br#
• Wu Chunxiao, Zhang Lu, Yang Fan, Wang Sheng, Zhang Tianfu, Wang Dong
• 2024 Vol. 21 (8): 9-14,91. DOI:10.3969/j.issn.1673-4440.2024.08.002
• Abstract ( ) PDF (1777KB)( )
• This paper primarily explores an axle counter system based on the Fiber Bragg Grating (FBG) sensing technology. The mechanism of FBG sensing and the principles of axle counting are introduced. Building upon this foundation, an FBG-based axle counter system is investigated, which is divided into three subsystems: sensing, demodulation and main control. The installation location and method of the FBG sensor are determined on the basis of the stress coupling distribution of the wheel and rail. Starting from the requirements of axle counting applications, the corresponding wavelength demodulation method for FBG is proposed, along with the structure design of the demodulation subsystem. The implementation method and functions of the main control subsystem are also introduced. The multiple-scenario tests of the FBG-based axle counter system are conducted at a selected freight station, and the results indicate that the proposed system can accurately perform the axle counting functions in complex scenarios such as passing, stopping, and reversing.
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• Research on Integration Auxiliary Tool for "One Book Diagram" of Signal Interlocking Wiring
• Jiang Jun, He Ding, Deng Faming, Ou Pingyang
• 2024 Vol. 21 (8): 15-20. DOI:10.3969/j.issn.1673-4440.2024.08.003
• Abstract ( ) PDF (2619KB)( )
• Railway signal design drawings are generally designed in sections such as interlocking, automatic blocking, and centralized signal monitoring. After the completion of the project, it is necessary to complete the verification and integration of the wiring diagram to form a "one book diagram". Relying on manual verification and integration of wiring diagrams has problems such as low work efficiency and low accuracy. This paper proposes an AutoCAD plugin based on technologies such as ". NET", "ObjectiArx", and table recognition logic algorithm to achieve functions such as drawing recognition, CAD graphic information recognition, CAD table data export, wiring diagram integration and restoration, and complete the integration of the "one book diagram" of whole station interlocking wiring. This tool has completed the integration verification of the "one book diagram" for the layout of normal-speed and high-speed railway stations, greatly improving work efficiency and drawing accuracy.
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• Research on Technical Solution for Railway Advanced Persistent Threat Detection and Traceability
• Hao Jinhui, Jiang Ming, Feng Kai
• 2024 Vol. 21 (8): 21-28. DOI:10.3969/j.issn.1673-4440.2024.08.004
• Abstract ( ) PDF (1279KB)( )
• Addressing the limitations of traditional defense technologies, and considering the characteristics of railway systems, this research adopts an integrated security defense strategy and achieves organic integration before, during and after an attack event. On the basis of the layered architecture of the railway network, a distributed and hierarchical defense-in-depth design is proposed, and a technical solution for railway network threat perception and traceability for APT is proposed, which achieves the integration of "distributed monitoring-intelligent identification-cross network traceability". Moreover, the laboratory environment for verification is built, which can effectively improve the prevention capabilities of railway systems against APT attacks.
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• Design of Signalling Vocational Training System Under Mode of Integration of Vocational Education with Industry
• Lu Bin
• 2024 Vol. 21 (8): 29-34. DOI:10.3969/j.issn.1673-4440.2024.08.005
• Abstract ( ) PDF (1880KB)( )
• This paper proposes the design objectives and principles for a signalling vocational training system under the mode for the integration of vocational education with industry. Based on this, the research designs the signalling training system covering CTCS-0 to CTCS-3 systems. The system adopts a semi--physical simulation method to emulate the actual operation logics of various signalling equipment, with the features of integration of virtual and physical elements, linkage of internal and external parts, and integration of teaching and assessments. This approach helps both reduce the investment costs and attain the teaching objectives of educational institutions, fostering closer collaboration between industry and education, and contributing to the cultivation of talents better aligned with the demands of the railway transportation sector.
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• Discussion on Design of Train Control System in Transformation of Complex Hubs
• Ouyang Zebang
• 2024 Vol. 21 (8): 35-40. DOI:10.3969/j.issn.1673-4440.2024.08.006
• Abstract ( ) PDF (814KB)( )
• This paper discusses some problems encountered in the design of train control system in the complex hub renovation project, including the method to choose different transition schemes in the renovation project of adding train routes for a large EMU depot, the feasibility demonstration of taking the train control system to degrade the mode for maintaining the operation of transportation, and the analysis of failures due to inadequate track circuit design and simulation content found in the dynamic verification with EMU. This paper proposes some rules followed and issues that need attention in the designing transition solutions of train control system, which have certain reference value for the implementation of similar projects.
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• Design and Realization of Data Management and Control Module for Fixed Radio of DRTD System#br#
• Cao Shuai, Gao Gao, Zhou Tianshu, Shi Jin
• 2024 Vol. 21 (8): 41-45,58. DOI:10.3969/j.issn.1673-4440.2024.08.007
• Abstract ( ) PDF (834KB)( )
• The Digital Radio Communication System for Train Dispatching (DRTD) based on digital communication technology will serve as an alternative solution of the 450 MHz train dispatching system. As the functional subject of the station side in the DRTD system architecture, the fixed station is responsible for intercommunication with the center side, adjacent stations, and other wired and wireless system components that require data and voice intercommunication. This paper conducts reasonable module distribution and function design for the data management and control module of fixed radio according to the type of each sub-function and the relation between each other,  which is divided into multiple sub-modules, such as database processing module, data receiving and sending module and information management and control module. The multi-threaded architecture is used for the development of the background service program of the module, to ensure the processing efficiency of the module functions, which effectively supports the function realization and system stability of the whole DRTD system. The module software has been applied in the field test and runs stably.
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• In-Depth Analysis of Handover Failures Caused by Abnormal BSIC Decoding in GSM-R Lines#br#
• Wang Fei
• 2024 Vol. 21 (8): 46-51,96. DOI:10.3969/j.issn.1673-4440.2024.08.008
• Abstract ( ) PDF (1425KB)( )
• The problem of multiple handover failures occurred several times during the testing and commissioning of Chizhou-Huangshan High-speed Railway are gradually investigated, and it is found that the fault occurred when the service cell initiated handover to the target cell (the cell with BSIC=50). This paper checks the CTCS-3 interface monitoring data of the trains with handover failure and signaling tracking data of the base station, and deeply analyzes the cell handover principle of the GSM-R system, to judge that the fault is determined to be a compatibility problem between the Triorail terminal and the base station, resulting in an abnormal BSIC decoding (in BSIC X0 configuration) and a handover failure. In view of this situation, after temporary measures are taken to either replace the Triorail terminal with the Funkwerk terminal or change the BSIC code, the test results show that the handover failure has not happened. However, it is still necessary to conduct in-depth cause analysis and disposal of abnormal BSIC decoding to avoid the recurrence of handover failure.
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• Research on Construction Scheme for Geological Disaster Monitoring System of Railway Slopes
• Zou Fang, Yuan Zhenjiang
• 2024 Vol. 21 (8): 52-58. DOI:10.3969/j.issn.1673-4440.2024.08.009
• Abstract ( ) PDF (1321KB)( )
• Although the railway permanent way departments invest a lot of manpower and material resources to strengthen the line patrol in the areas with geological hazards every year in the flood season, there are problems such as large personnel investment, low efficiency and poor real-time performance. This paper proposes a construction scheme of railway slope geological hazard monitoring system based on multi-sensor detection technology, covering geological hazard monitoring points, the work safety command center of permanent way depot, and the permanent way dispatching center of railway bureau, to meet the requirements of automatic monitoring of geological hazards in flood season.
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• Synergetic Modes of and Key Technologies for Multi-mode Rail Transport Networks
• Liu Jun, Liu Gehui, Zhang Bo, Shi Bijia, Lan Zhen
• 2024 Vol. 21 (8): 59-66. DOI:10.3969/j.issn.1673-4440.2024.08.010
• Abstract ( ) PDF (1355KB)( )
• After large-scale construction, the multi-type, long-mileage and high-density rail transit network has become an important support of the improvement of regional transportation service level and the development of urban agglomeration. Concerning the policy direction of four-railway-network integration, promoting the intensive resource usage of multi-type rail transit, optimizing transportation efficiency, promoting regional development and improving synergetic level have become the key issues in the rail transit and regional development. Based on the basic connotation and policy guidance of the multi-type rail transit synergetic development, this paper introduces four main synergetic modes, including independent operation, service integration, interoperability, and regional coordination. This paper also proposes technology system for the synergetic development of multi-type rail transit aiming at the implementation of interoperability and the improvement of service level. The proposed synergetic modes and technology system can provide the theoretical supports and reference for the multi-level and cross-type rail transit synergy integrative development in China.
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• Design of Redundant Signal Power Supply of Train Control System for Subway#br#
• Zhu Bo
• 2024 Vol. 21 (8): 67-73. DOI:10.3969/j.issn.1673-4440.2024.08.011
• Abstract ( ) PDF (1029KB)( )
• The train control system of subway is the core system of modern urban subway operation. The stable and reliable signal power supply is very important to ensure the safety of subway operation and passenger travel. This paper proposes a stable and reliable design scheme of redundant signal power supply. Firstly, the overall structure of the redundant signal power supply is introduced. Secondly, according to the overall structure, the specific implementation scheme of the redundant power supply circuit, EMC protection circuit and load sharing circuit is explained in detail. the principle diagrams of the relevant circuits are provided, and the specific parameters of the adopted components are described. Finally, the ripple test, noise test, impulse current test and redundancy characteristic test of the redundant signal power supply are carried out, the testing process is explained in detail, and the test results are given.
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• Fault Prediction of Subway Onboard Equipment Based on Ridge Regression
• Sun Chao
• 2024 Vol. 21 (8): 74-79. DOI:10.3969/j.issn.1673-4440.2024.08.012
• Abstract ( ) PDF (919KB)( )
• Aiming at the onboard equipment with repeated failures in actual field records, a fault time prediction method based on ridge regression algorithm is proposed in order to predict its next failure time. This paper extracts six effective fault features by random forest algorithm combined with human experience in the whole research process, and establishes ridge regression fault prediction model, optimizes the hyper-parameters of the model by grid searching combined with cross validation (Gridsearch CV), which is effectively verified in actual data of a subway line in Shenzhen. The next fault can be predicted more accurately according to the proposed methods as a basis for guiding preventive maintenance, so as to realize the prediction in advance, perception in advance and processing in advance of the faults.
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• Reduction of Abnormal Wear of Rigid Catenary Through Steel and Aluminum Composite Rail
• Han Chaojian, Li Na, Lu Jun, Ni Guozheng
• 2024 Vol. 21 (8): 80-85. DOI:10.3969/j.issn.1673-4440.2024.08.013
• Abstract ( ) PDF (2641KB)( )
• At present, urban rail transit mostly uses rigid overhead catenary power supply mode to provide electric power for electric passenger vehicle. The rigid catenary has the characteristics of low operating cost, high reliability and simple maintenance, and small failure and damage range in accident state. However, the rigid catenary wears out quickly, and the serious wear of the pantograph pantograph-catenary attrition will greatly reduce the service life of the catenary, and increase the operating cost. Taking Tianjin Metro Line 6 as an example, this paper proposes the method of replacing rigid catenary with overhead steel and aluminum composite rail, in order to improve the wear condition of catenary, promotes the good matching of pantograph, and improves the quality of equipment to ensure the safety of equipment.
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• Design of Distributed Switch Controller System
• Cheng Rong, Ren Xiguo, Xing Meili, Liu Hanyu
• 2024 Vol. 21 (8): 86-91. DOI:10.3969/j.issn.1673-4440.2024.08.014
• Abstract ( ) PDF (3200KB)( )
• Targeting the distributed control scenarios of tramways, this paper designs a distributed switch controller system. The switch controller comprises intelligent power modules, safety logic operation modules, and all-electronic actuator units. By designing various functional modules of the switch controller, safe data acquisition and drive control of trackside equipment are achieved. This design features a simple structure and has been successfully applied in engineering.
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• Necessity of Modifying Maximum Communication Transmission Time of AzS350U Axle Counting System
• Liu Jianyong, Long Jianshu, Sun Xiaowei
• 2024 Vol. 21 (8): 92-96. DOI:10.3969/j.issn.1673-4440.2024.08.015
• Abstract ( ) PDF (833KB)( )
• AzS350U axle counting system is used for certain domestic Metro Line 6, and which is used as the train detection equipment under the backup mode of signal system. In the CBTC mode, the axle counting fault can be immediately cut off by the zone controller (ZC) and become a brown light band, without affecting CBTC train operation. However, it is found in the actual operation process that when the host modular block in the axle counting room is crashed,  there are cases where the corresponding axle counting sections cannot be normally removed by ZC, resulting in the expansion of the fault. In view of the defects in the interface part of the system, this paper makes an in-depth analysis combined with the principles of axle counting and signal system, and proposes to modify the maximum allowable communication transmission time set by the axle counting system, for fundamentally solving the impact of this defect on normal operation.
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• Consideration About Construction of Top-level Dispatching System for Interoperability of Urban (Suburban) Rail Transit
• Liang Dongze, Liu Jun, Lu Jia, Zhou Qian
• 2024 Vol. 21 (8): 97-103,108. DOI:10.3969/j.issn.1673-4440.2024.08.016
• Abstract ( ) PDF (1218KB)( )
• The construction of interoperability within the urban (suburban) rail transit network and the realization of cross line intermodal transportation is an important means of efficient and convenient travel within city cluster, metropolitan area, and between cities. The construction of cross line intermodal transportation and network operation requires the consideration of the construction mode of top-level scheduling system. This paper combines the requirements of the top-level scheduling system and application cases in China and other countries, to analyzes the advantages and disadvantages of the three-layer architecture and two-layer architecture, and provides reference for the construction of the top-level scheduling system for urban (suburban) rail transit.
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• Discussion and Solution of Fault of FZL300 System without Train Door Authority
• Song Rui
• 2024 Vol. 21 (8): 104-108. DOI:10.3969/j.issn.1673-4440.2024.08.017
• Abstract ( ) PDF (905KB)( )
• In view of the frequent faults without door opening permission of the FZL300 signaling system for Hefei Metro Line 3 in the early stages, in order to improve the operation service quality, this paper introduces the methods to solve the problem that a train stopping position cannot meet the predetermined standard through problem sorting, data analysis, and test verification, so as to reduce the occurrence rate of this  train door fault and improve the stability and reliability of the system operation.
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• Optimization Design of Coding Circuit for Misreceived Code Scenarios
• Yan Yuhang
• 2024 Vol. 21 (8): 109-115. DOI:10.3969/j.issn.1673-4440.2024.08.018
• Abstract ( ) PDF (1163KB)( )
• There are multiple departure locations at Sunjia Station on the Harbin-Jiamusi Rapid Railway, and the station type is complex. During on-site testing, it is found that there are cases of mistakenly receiving HU codes during train operation when handling some arrival routes. Based on the transmission principle of cab signaling, this paper analyzes and studies the causes of train code errors, proposes solutions for each reason, and focuses on optimizing the design of coding circuits from the perspective of using different basic carrier frequencies for train arrival and departure routes, adding code switching relays, and other optimization design schemes. After the optimization scheme is adopted on site, the impact of code errors on actual operation is avoided; Based on the optimized design scheme, design suggestions have been proposed for similar projects to avoid erroneous code reception, providing design ideas for future projects.
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• Design and Implementation of Interface Board Test Device
• Yan Zhihong
• 2024 Vol. 21 (8): 116-122. DOI:10.3969/j.issn.1673-4440.2024.08.019
• Abstract ( ) PDF (1165KB)( )
• This paper combines with Qt software and explains the development of multiple interface boards test device of General Safety Signal Application Platform (GSSAP) based on Embedded Common Plugins (ECP) industrial computer as a hardware platform. The functional modules of the test device are designed by analyzing the functions of multiple interface boards. For the difficulties of the device implementation, including massive interconnection and small resistance test, this paper proposes that summarizing signals of test modules to general adapter cards, and designing adapter cards for each product under test to achieve signal transfer, and testing the small resistance through four-wire method. The test device has the advantages of easy operation, convenient expansion etc.
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• Research on Solution for Train Operation Organization of Adjacent Dispatching Consoles in CTC System of Hungary-Serbia Railway
• Li Zheng, Ren Maocheng, Wang Lijun
• 2024 Vol. 21 (8): 123-127. DOI:10.3969/j.issn.1673-4440.2024.08.020
• Abstract ( ) PDF (977KB)( )
• A separate dispatching console will be installed on the to-be-opened Novi Sad-Subotica section of the Hungary-Serbia Railway, and the new dispatching console and the dispatching console already-opened on Belgrade-Novi Sad section will be treated as adjacent dispatching console during train operation organization. Combined with the actual use of the dispatching console by the owners in the Belgrade-Novi Sad section, this paper will focus on the studies and discussions of the traffic operation organization between adjacent dispatching console in the Hungary-Serbia Railway Project, and propose a preliminary design and concept for the CTC system solution from the perspective of planning source and adjustment plan. This paper also provides solutions for improving the availability and automation of CTC systems.
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