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Impacts of Constant Magnetic Field on Passive Balises and Its Protection Technologies
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Cao Hefei, Meng Tianxu, Li Hao
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2023 Vol. 20 (12):
1-6.
DOI:10.3969/j.issn.1673-4440.2023.12.001
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Abstract (
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Maglev transportation is a new technology for urban rail transit; and its emitted constant magnetic field affects passive balise, which may cause additional risks to the safe operation of trains. This paper first analyzes the electromagnetic environment of balises, performs the disturbance test for the passive balise, and locates the sensitive parts of the device. It then puts forward such protection technologies as magnetic field dredging and angle optimization, according to the coupling characteristics of the constant magnetic field with the inductive parts, and conducts the effectiveness verification. This research achieves substantial improvement for the adaptability of the passive balise under constant magnetic field; and provides reference for the immunity of other train control equipment of the maglev system under constant magnetic field.
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Research on Encoding Scheme of Balise Telegram [CTCS-2] for Temporary Speed Restriction of Train Control Center
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Chen Bin, Zhou Xiaohui
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2023 Vol. 20 (12):
7-13.
DOI:10.3969/j.issn.1673-4440.2023.12.002
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Abstract (
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As key wayside equipment of the CTCS-2 train control system, the train control center achieves real-time encoding of balise telegrams for temporary speed restriction according to the temporary speed restriction command and train route status. On the basis of an analysis of the impacts of the balise telegram capacity on the telegram encoding of temporary speed restriction for siding track departure, and in view of the Technical Specification of Train Control Center, this paper proposes a new solution for the telegram encoding of temporary speed restriction for siding track departure. The proposed solution can meet the requirements of the common scenarios of the CTCS-2 train control system for high-speed railways, simplify the plan for engineering implementation, and reduce the workload of engineering software development and testing, which achieves the goals of ensuring train operation safety and increasing train operating efficiency.
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Design of Switching Control Circuit for Outdoor Signal Equipment Shared by Multiple Interlocking Systems
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Wang Dingming
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2023 Vol. 20 (12):
14-20.
DOI:10.3969/j.issn.1673-4440.2023.12.003
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Abstract (
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In the construction of practical training bases for signaling systems, there is a need for switching the control by multiple interlocking systems over one set of outdoor signal equipment at the station, to reduce the repetitive construction, site occupation and capital investment of outdoor equipment. Based on the relay logic circuit method, a switching control circuit is designed to allow five interlocking systems to share one set of outdoor signal equipment at the station. The multiple interlocking systems are physically excluded, and only one interlocking system can control the outdoor signal equipment at the station at a time. In the event of any fault of the switching control circuit, each interlocking system can operate independently. The button circuit is designed to achieve the switching selection and control of two buttons; and the indicator circuit is designed to display the interlocking type and status of the current interlocking system that controls the indoor and outdoor equipment. The tests indicate that the proposed circuit can meet the requirements for switching the control by multiple interlocking systems over one set of outdoor signal equipment, and that it has certain promotion value.
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Discussion on Interlocking Technical Conditions for Switches Lying Midway in Receiving-Departure Tracks
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Ding Jianli
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2023 Vol. 20 (12):
21-25.
DOI:10.3969/j.issn.1673-4440.2023.12.004
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Abstract (
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There are many kinds of switches lying midway in receiving-departure tracks at railway stations. For some special switches lying midway in receiving-departure tracks, the existing technical conditions for switches lying midway in receiving-departure tracks cannot meet the actual application requirements. This paper introduces the application scenarios for different types of switches lying midway receiving-departure tracks in actual projects, and analyzes what special treatments computer based interlocking needs to provide for each application scenario on the basis of the standard protection circuit for switches lying midway in receiving-departure tracks, to ensure the safety of train operation while meeting the needs of transportation operations at stations.
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Research on Optimization Scheme of Network Management System for Railway Vital Signaling Data Networks
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Li Xiang, Zhao Jingjing
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2023 Vol. 20 (12):
26-30,42.
DOI:10.3969/j.issn.1673-4440.2023.12.005
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Abstract (
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To further improve the system performance of railway vital signaling data networks, this paper analyzes the existing in-band network management system and its problems based on an analysis of the existing management system for vital signaling networks. Then, it proposes an optimization scheme of the grid structure for in-band network management system and the time synchronization of NMS and CTC. Moreover, it points out that the out-of-band network management system can be introduced into the current railway network management system, and that the optimization scheme can be achieved through the cooperation of the in-band and out-of-band systems. This research can provide reference for further improving the reliability of the network management system for railway vital signaling data networks in China.
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DZ9 DC Electric Switch Machines Suitable for Four-wire Double-machine Driving Control Circuit
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Zhang Hui
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2023 Vol. 20 (12):
31-36,46.
DOI:10.3969/j.issn.1673-4440.2023.12.006
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Abstract (
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To support the on-site switch transformation from single-machine driving to double-machine driving with ZD9 DC switch machines, research work is conducted for ZD9 DC switch machines suitable for four-wire double-machine driving control circuit. The transmission ratio of the transmission system composed of gear box and lead screw is adjusted to allow the ZD9 switch machine to meet the technical requirements for switching time and working current. The ZD9 switch machine suitable for four-wire double-machine driving control circuit is tested in view of the usage characteristics of the four-wire double-machine driving control circuit. The test results indicate that the proposed switch machine can meet the requirements for on-site application. Moreover, maintenance recommendations are made for on-site application.
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Comprehensive Monitoring System for Operating Parameters of Switch Machines
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Huang Chentao
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2023 Vol. 20 (12):
37-42.
DOI:10.3969/j.issn.1673-4440.2023.12.007
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Abstract (
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To improve the maintenance level and management efficiency, it is necessary to monitor the operating parameters of switch machines. This paper describes a comprehensive monitoring system for the operating parameters of switch machines. The proposed monitoring system can monitor the working conditions of several key components in the switch machine, including the push plate sleeve, throw rod, indication rod, motor and movable contact. On this basis, it can provide early warning, alarming and fault location judgment for faults caused by moving components in the switch machine. Thus, it enables the on-site maintenance personnel to maintain and repair the equipment in time before the failure occurs, so as to achieve "preventative maintenance".
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Application of RTP Stream Audio Playback Technology in 400 MHz DRTD System
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Zhao Wenjie
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2023 Vol. 20 (12):
43-46.
DOI:10.3969/j.issn.1673-4440.2023.12.008
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Abstract (
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This paper introduces the audio playback technology for wireless voice services in the DRTD system. The wired communication of the DRTD system is based on the SIP protocol and RTP stream for audio transmission. The audio stream is transmitted via the wireless air interface through such processing processes as mixing, windowing based VAD, caching, format conversion, and signaling control, and finally voice waveform playback is achieved at the mobile terminal, thus bridging the wired communication and wireless communication in the train dispatching communication and providing support for the core services of the DRTD system.
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Main Roles and Fault Diagnosis of STP in GSM-R Networks
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Yan Huixia, Zhao Jianguo, Li Xiufang, Yang Zhibin
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2023 Vol. 20 (12):
47-54.
DOI:10.3969/j.issn.1673-4440.2023.12.009
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Abstract (
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As the “heart” of GSM-R networks across China’s railway network, STP (Signaling Transfer Point) provides the function of signaling transfer from local MSC to HLR, from local SGSN to HLR, from local MSC to SCP, from SCP to HLR, and during inter-local calls between MSCs. Based on the networking architecture of GSM-R networks and the application situation of GSM-R networks for communication services in railway train operation, this paper conducts detailed research and analysis on the signaling routing and signaling message switching across China’s railway network, and judges the fault point and impact scope of the potential hidden equipment faults, to take effective and timely emergency disposal measures. Thus, it provides reference for day-to-day maintenance, fault analysis and emergency disposal.
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Discussion on Application of Virtual Firewall Technology to Network Security in Railway Communication Network Management
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Tang Lu
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2023 Vol. 20 (12):
61-65.
DOI:10.3969/j.issn.1673-4440.2023.12.011
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Abstract (
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Against the background of the development of network security technologies such as railway communication data network and transmission network, and in accordance with the strategy of "integration, centralization and protection" for security protection in railway communication networks, this paper puts forward the concept of using the virtual firewall technology to share one network security protection system at the network security boundary of various communication network management systems. The proposed concept aims to achieve the purposes of service isolation, management and control isolation, and equipment resource sharing among various systems, so as to meet the network security needs of various network management systems for communication systems.
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Analysis, Locating and Disposal of Obstacles of Communication Optical Cables
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Yao Wei
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2023 Vol. 20 (12):
66-71.
DOI:10.3969/j.issn.1673-4440.2023.12.012
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Abstract (
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This paper aims to discuss the common obstacles detected during the maintenance of railway communication optical cables, and explore the methods to analyze and locate and deal with such obstacles. According to the situation of fiber core blocking, the obstacles of optical cables are divided into several types, such as complete blocking, partial blocking, and excessive fiber attenuation. The causes of optical cable obstacles are analyzed, and are divided into natural disasters, external forces, human factors, and cable defects. For different types of optical cable obstacles, corresponding handling methods are proposed, including the principles for dealing with faults and obstacles, the sequences for achieving emergent reconnection and recovery, and the methods for locating and dealing with cable fault points. This paper emphasizes the importance of day-to-day maintenance management of railway communication optical cable lines, to ensure the safe operation of railway communication equipment, so as to guarantee the safety of railway transportation.
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Design Analysis of Interoperability Between CBTC and CTCS in Suburban Railways
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Zhang Yongtao, Zhou Xin, Jin Jie, Zhu Suoming
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2023 Vol. 20 (12):
72-77,92.
DOI:10.3969/j.issn.1673-4440.2023.12.013
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Abstract (
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With the issuance of the development plans for core metropolitan areas in China, and the acceleration of the construction of suburban railways that expand the urban framework, there is an increasingly urgent demand for the selection of signal system modes for suburban railways. In view of the status and technical specifications of the signal system industry, the main signal system modes selected for suburban railways are CTCS-2+ATO system, CBTC system, etc. Therefore, a sufficient discussion is needed for the selection of and integration between CBTC system for metro lines and CTCS system for national railways. The two systems need to be comprehensively considered in terms of onboard equipment architecture, wayside equipment, system software and hardware, communication protocol, etc. This paper discusses the possibility of integration and interoperability between CTCS-2 and CBTC on the basis of the requirements for the selection of signal system modes for suburban railways. It proposes relevant designs and conducts feasibility analysis for three different schemes, i.e. CTCS-2 and CBTC fully integrated with each other, interoperable with each other and switching between each other. In particular, it performs research and analysis in terms of the interoperability scheme, interfaces, switching area, switching process, etc., and provides detailed schemes, on the basis of the requirements for interoperability. The interoperability scheme is found to be more feasible than the full-integration scheme.
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Application of Quantum Secure Communication in AFC Systems
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Wang Jian, Li Yu, Zhang Yiran, Wu Juan, Zhang Mingzhu
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2023 Vol. 20 (12):
78-82.
DOI:10.3969/j.issn.1673-4440.2023.12.014
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Abstract (
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The quantum secure communication technology is theoretically unbreakable; and has stronger security protection capabilities than traditional encryption methods. This paper proposes an applied design scheme for quantum secure communication in automatic fare collection (AFC) systems of urban rail transit on the basis of the actual requirements of the AFC system, and in view of the architecture and network transmission scheme of the AFC system. The quantum security equipment is deployed at the clearing center, the line center, and various stations; and the quantum secure communication technology is used to encrypt and transmit the sensitive information of the AFC system. Thus, the data transmission security of the core service system is ensured, and the security protection capability of the AFC system is improved. The proposed design scheme has the characteristics of high security, low impact on AFC system, low implementation difficulty, and strong replicability; and can provide reference for the application of the quantum secure communication technology in various AFC systems of urban rail transit.
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Scenario-Based Safety Analysis Method for Fully Automatic Train Operation Systems
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Fu Wenjia, Han Tao, Liu Qian, Zhu Tianmin
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2023 Vol. 20 (12):
83-87.
DOI:10.3969/j.issn.1673-4440.2023.12.015
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Abstract (
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This paper proposes a scenario-based safety analysis method for fully automatic train operation systems. All the operation scenarios of fully automatic train operation systems are modeled, and the influencing factors in each scenario are identified, to quickly identify the possible operational risks and avoidance measures in each operation scenario of fully automatic operation systems. The effectiveness assessment of such measures is made on the basis of the residual risks. Thus, a series of protection measures through human intervention are obtained for various operating scenarios of fully automatic systems, which solves the problem that the systems provided by multiple suppliers cannot be analyzed as a whole, and improves the operation safety of fully automatic systems.
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Research on DC Bus Overvoltage Fault in Double UPS Parallel Operation
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Liao Bairui, Liu Kunpeng, Jiang Liangzhi, Sun Xiaowei, Yi Bingqiang
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2023 Vol. 20 (12):
88-92.
DOI:10.3969/j.issn.1673-4440.2023.12.016
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In view of such frequent alarm-triggering failures as DC bus overvoltage reported by the signal system of Haizhu Square Station of Guangzhou Metro Line 6 after the transformation into UPS parallel operation, this paper provides an in-depth analysis, demonstrates the causes, and puts forward a solution of such failures. It also summarizes the matters needing attention in the transformation into UPS parallel operation, with a view to providing reference for peers in various cities.
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Discussion on Asymmetric Double Bus Redundancy Scheme of Signal Power Subsystem for Urban Rail Transit
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Xie Qiao
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2023 Vol. 20 (12):
93-98,114.
DOI:10.3969/j.issn.1673-4440.2023.12.017
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The signal system for urban rail transit can ensure train operation safety, increase transportation efficiency, improve the working environment, and promote management modernization. Therefore, a stable and reliable power subsystem is crucial for the stable and reliable working of the signal system. This paper analyzes the structure schemes of the signal power subsystems of Nanning Rail Transit Line 1 to Line 5. By summarizing the advantages and disadvantages of different structure schemes, and considering the actual situation at the site, it puts forward the asymmetric double bus redundancy scheme, to improve the stability, safety and reliability of the power subsystem, so as to meet the power supply needs of the signal system for urban rail transit.
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Research on Network Handover Scheme of ATS Master/Standby Center Based on VRRP Protocol
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Shi Bin
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2023 Vol. 20 (12):
99-105.
DOI:10.3969/j.issn.1673-4440.2023.12.018
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Abstract (
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This paper proposes a network switching technology for ATS master and backup centers based on VRRP (Virtual Router Redundancy Protocol) under the cloud platform architecture for urban rail. It also analyzes and discusses the networking requirements, switching principles, networking structure, network design and other aspects of the switching of ATS master and backup centers. It aims to achieve the switching of the ATS master and standby centers for disaster recovery on the basis of the robustness of the networks of the ATS primary and standby centers, so as to improve the operation efficiency and service quality. It has certain reference value for the switching needs of the master and standby centers of the ATS system of signaling systems for urban rail transit under the cloud platform architecture, and provides reference for subway signal system projects in the same scenario.
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Study of Flank Protection Function of Computer Based Interlocking in Serbia
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Jin Songyue
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2023 Vol. 20 (12):
106-109.
DOI:10.3969/j.issn.1673-4440.2023.12.019
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Abstract (
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Flank protection is an important means in computer based interlocking to ensure train operation safety; and level-two flank protection is a technical method to improve efficiency while ensuring train operation safety. This paper analyzes the typical application scenarios of flank protection and level-two flank protection, introduces the application situation of flank protection and level-two flank protection by computer based interlocking in Serbia, and the realization method of flank protection and level-two flank protection by computer based interlocking.
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月刊
Monthly
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第21卷 第6期 总第期
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Vol.21 No.6 S.No.
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出版：
2024-06-24
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Published on:
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创刊：2004 年
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First Issue: 2004
