• Research on Integrated Operation Scheme of Locomotive Depot
• Chen Jianxin
• 2022 Vol. 19 (2): 1-5. DOI:10.3969/j.issn.1673-4440.2022.02.001
• Abstract ( ) PDF (1402KB)( )
• Through the analysis of current business situation and business processes of locomotive depot, based on the technical concept of information interlocking and the integration of management and control, this paper proposes an integrated operation scheme of locomotive depot, which constructs a unified operation management and control platform, realizes fine planning, automatic operation and intelligent safety protection, so as to improve the operation efficiency of locomotive depot and speed up the locomotive turnover.
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• Application of Sectional Integrated Supervisory and Control System (QJK) in Irregular Station
• Wang Xiaohui
• 2022 Vol. 19 (2): 6-10. DOI:10.3969/j.issn.1673-4440.2022.02.002
• Abstract ( ) PDF (1314KB)( )
• This paper introduces the functions of railway signaling sectional integrated supervisory and control system (QJK), proposes a design method of section-oriented to applicate QJK by analyzing the features of those functions and combining the application requirements of irregular station, at last forms an application implementation scheme of QJK in the irregular station, which provides an operable technical scheme for the double-track section (one track with siding and the other track without siding) to apply QJK inside the station.
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• Design Concept of BTM Intelligent Detection System
• Liu Di
• 2022 Vol. 19 (2): 11-14. DOI:10.3969/j.issn.1673-4440.2022.02.003
• Abstract ( ) PDF (1207KB)( )
• Balise transmission module (BTM) is an important component unit of ATP equipment of CTCS-2/3 train control onboard system. The normal operation of BTM has a direct impact on the application of ATP. The design concept of BTM intelligent detection system shall be researched, and it also shall to study how to use more convenient testing methods to implement the testing of BTM down link transmitting signal center frequency, down link transmitting signal energy, uplink signal frequency deviation and uplink signal Iu1, so as to judge whether the BTM is working in a sub-health state. Meanwhile, a large amount of detection data is accumulated to provide a basis for the subsequent BTM performance trend analysis and fault prediction by using big data technology.
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• Discussion on Scheme of Intelligent Point Heating System for Zhangjiajie-Jishou-Huaihua High Speed Railway
• Yu Guanhua, Wei Xuchu
• 2022 Vol. 19 (2): 15-17,34. DOI:10.3969/j.issn.1673-4440.2022.02.004
• Abstract ( ) PDF (1217KB)( )
• Starting from the actual situation of Zhangjiajie-Jishou-Huaihua high-speed railway which will adopt point heating equipment, this paper analyzes the problem of large power consumption existing in the traditional RD1 electric point heating system, thus innovatively adopts the dispatching-based scheme of intelligent point heating system, and introduces in detail the structure, intelligent control algorithm and intelligent control effect of intelligent point heating system. Finally, the conclusion that the dispatching-based intelligent point heating system proposed in this paper can greatly save electric energy compared with the traditional point heating system is obtained.
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• Design of Interlocking Translator Software Oriented to Formal Verification
• Wang Shaoxin, Wang Yanqin, Yan Lianshan
• 2022 Vol. 19 (2): 18-23,42. DOI:10.3969/j.issn.1673-4440.2022.02.005
• Abstract ( ) PDF (2297KB)( )
• According to the system requirements in formal verification of the interlocking system, this paper designs an overall scheme of translator software for interlocking data, which realizes the translation and conversion of station interface files, TLE files and Boolean logic files, and generates the LCF files for formal verification. Finally, the code implementation of the translator software based on the functional language OCaml is explained in detail.
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• Research on Wireless Schemes for Ultra-long Sea-crossing Bridge of High-speed Railway
• Liu Ning
• 2022 Vol. 19 (2): 24-29. DOI:10.3969/j.issn.1673-4440.2022.02.006
• Abstract ( ) PDF (1991KB)( )
• The conventional high-speed iron tower scheme for the land section is no longer suitable for the scenario of the ultra-long sea-crossing bridge. From the perspective of engineering implementation, this paper proposes several feasible schemes for wireless solution and equipment arrangement suitable for the scenario of ultra-long sea-crossing bridge at the speed of 350 km/h by fully considering the interface with bridge and catenary professions. The research results can provide references for subsequent projects with this scenario.
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• Discussion on Improving Security Factor of Transmitting Ethernet
• Wu Guilong
• 2022 Vol. 19 (2): 30-34. DOI:10.3969/j.issn.1673-4440.2022.02.007
• Abstract ( ) PDF (1162KB)( )
• During daily maintenance, the main and standby channels of transmitting Ethernet aggregation services such as infrared ray, traction and electric power on Tang-Bao line have been completely interrupted for several times, and there is no troubleshooting, locating and recovery method available on the user side. It requires to locate the fault point by transmission network and data network, which has high professional requirements for maintenance personnel, complicated operation of network administrator, long troubleshooting time and wide impact range, and endangers the normal application of railway train operation and exists great hidden safety risks. This paper discusses that by optimizing the networking structure of the transmitting Ethernet aggregation service, the main and standby channels of the transmitting Ethernet aggregation service can be prevented from totally interrupted, the number of faults and the impact range can be reduced, the fault location can be quickly located in the event of a fault and the network administrator can easy to operate. Thus, the security and reliability of the railway transmitting Ethernet aggregation service can be effectively improved.
  
  
  
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• Application of Safety Access of Service Terminals Based on SSL VPN Protocol
• Xu Wenyuan
• 2022 Vol. 19 (2): 35-37,50. DOI:10.3969/j.issn.1673-4440.2022.02.008
• Abstract ( ) PDF (1048KB)( )
• This paper adopts the access authentication and authorization mode of virtual private network (VPN) based on secure sockets layer (SSL) protocol, and realizes the trusted and secure encrypted communication between each network management repeater terminal and network management server of railway data communication network through the functions such as network expansion and web agent of SSL VPN protocol, etc.
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• Concealed Design Scheme of Broadcasting Equipment in High-speed Railway Passenger Station Platform
• Li Jungang
• 2022 Vol. 19 (2): 38-42. DOI:10.3969/j.issn.1673-4440.2022.02.009
• Abstract ( ) PDF (5852KB)( )
• This paper introduces a concealed design scheme of platform broadcasting equipment combined with the construction and implementation scheme of Chaoyang-Linghai high-speed railway. By adopting the setting scheme combined with static signs, the effect of concealed installation of broadcasting equipment can be achieved. The coverage of platform broadcasting sound field under this scheme is simulated by EASE software, and combined with the on-site real listening and feeling, it is confirmed that the scheme can meet the actual operational requirements of platform broadcasting system.
  
  
  
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• Analysis of Source of Wireless Communication Loss and Technical Requirements of STP-yh System
• Yuan Jiangtao, Wang Xinyong, Ma Jinxin, Zhang Shaolei
• 2022 Vol. 19 (2): 43-46,80. DOI:10.3969/j.issn.1673-4440.2022.02.010
• Abstract ( ) PDF (1407KB)( )
• The wide application of STP-yh system effectively ensures the on-site safety of shunting operation. However, with the increase of service life year by year, the pressures of operation and maintenance are becoming increasingly prominent. By analyzing the electromagnetic wave transmission loss of each component of wireless channel of STP-yh system, using the typical Hata-Okumura model curve method, combining with the specific situation in the actual maintenance, the main factors of wireless signal interruption are summarized, which provides theoretical guidance and maintenance technical requirements for the on-site equipment management department in the fault handling of wireless signal interruption.
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• Performance Comparison of Common Spread Spectrum Communication Technologies
• Sun Bolun, Zhao Guoqiang, Ding Baiyi
• 2022 Vol. 19 (2): 47-50. DOI:10.3969/j.issn.1673-4440.2022.02.011
• Abstract ( ) PDF (1497KB)( )
• This paper introduces several common spread spectrum technologies, and compares the direct sequence spread spectrum technology, Chirp spread spectrum technology and BOC spread spectrum technology under the condition that the chip time lengths after spread spectrum are same. It is designed to help readers have a deeper understanding of spread spectrum communication technology and provide reference for readers to choose a spread spectrum communication technology with better performance when spread spectrum communication technology needs to be used in a communication system.
  
  
  
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• Air Interface Time Slot Collision Probability Algorithm of MESH ad Hoc One-hop Nodes on Heavy-haul Railway
• Zhao Guoqiang, Liu Yiwei, Sun Bolun
• 2022 Vol. 19 (2): 51-54. DOI:10.3969/j.issn.1673-4440.2022.02.012
• Abstract ( ) PDF (1944KB)( )
• Long distance ad hoc network communication technology can be adopted to realize train-train communication for heavy-haul train. Based on TDMA principle, this paper establishes models aiming at the probability of frequent-point resource collision between one-hop nodes in ad hoc network, and puts forward the calculation method for air interface collision probability of heavy-haul railway MESH ad hoc network communication node. Through the key parameter setting, the system collision probability between one-hop nodes can be calculated, and by using Monte Carlo method, the statistical simulation verification in MATLAB will be performed, which have guiding significance to system design and engineering design optimization.
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• Deployment Scheme of Portrait Recognition System for an Existing Metro Line
• Li Nan
• 2022 Vol. 19 (2): 55-58. DOI:10.3969/j.issn.1673-4440.2022.02.013
• Abstract ( ) PDF (1213KB)( )
• This paper briefly introduces the key technical points and mainstream solutions of portrait recognition system, compares and selects from two common deployment schemes of image retransmission and video stream retransmission, and puts forward the recommended scheme. Based on the current situation of urban rail transit line 3 in a city, this paper discusses the key points in the construction of portrait recognition system on the existing lines, including the utilization and supplement of the existing front cameras, the calculation and expansion of transmission bandwidth, etc.
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• Research on EMI of TWC of Signaling System for Medium and Low Speed Maglev Transit
• Zhao Dongliang
• 2022 Vol. 19 (2): 59-64. DOI:10.3969/j.issn.1673-4440.2022.02.014
• Abstract ( ) PDF (3852KB)( )
• According to the EMI problem of TWC for signaling system in Beijing urban line S1, this paper analyses and determines the cause of EMI, proposes the corresponding measures of interference suppression. The measures have achieved good effect and guaranteed the stable operation of Beijing urban line S1, and the research and measures have accumulated experiences for the subsequent construction and maintenance of medium and low maglev transit.
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• Dangerous Effects and Protection Schemes of Railway Signaling Cables in Suburban Railways
• Wang Guojun
• 2022 Vol. 19 (2): 65-69. DOI:10.3969/j.issn.1673-4440.2022.02.015
• Abstract ( ) PDF (1275KB)( )
• Due to the high speed of a train, AC27.5 kV power supply scheme is often used in suburban railways. In the shield area, signaling cables, overhead contact lines and other strong electric cables are relatively close due to the limited laying space. Dangerous influence on signaling cables and their protective measures must be considered in the project implementation stage. Strong and weak grounding round steel or flat steel is considered to be installed on the cable supports on both sides of the tunnel wall respectively, which is equivalent to the combined through grounding cable in national railway. Based on the cable layout of overhead contact line and signaling cable in the shield area, this paper introduces preliminary calculation of the magnitude of the magnetic induction electromotive force generated by the signaling cable of electro-magnetic induction of overhead contact line when the train is operating at the highest density on basis of the design of power supply system, and gives quantitative analysis of the maximum allowable cable length considering the magnetic induction electromotive force of not more than 60 V on the signaling cable in the electromagnetic environment.Combined with the current various technical conditions and relevant test data analysis results, a protection measure and scheme for the use of double-ended or multi-point grounding for signaling cables in the AC power traction of suburban railways are proposed.
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• Application of Big Data Technology in Urban Rail Transit
• Song Dazhi, Wang Jian, Xu Zhongquan, Liu Guangjie
• 2022 Vol. 19 (2): 70-75. DOI:10.3969/j.issn.1673-4440.2022.02.016
• Abstract ( ) PDF (1093KB)( )
• Through the introduction of big data technology, the platform established based on the line networking data center has gradually replaced the previous integrated monitoring system of single grid level. This paper analyzes and studies the application requirements, application ideas, application methods and business scenarios of big data technology in rail transit construction, and forms intelligent decision analysis through big data analysis technology to assist the coordination command of urban rail line networking and provide powerful support services of big data.
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• Application of Modbus/TCP Communication on Human-machine Interface for Train Control and Monitoring System
• Li Kunpeng, Yan Shiqi
• 2022 Vol. 19 (2): 76-80. DOI:10.3969/j.issn.1673-4440.2022.02.017
• Abstract ( ) PDF (1412KB)( )
• This paper presents a TCMS HMI Ethernet communication solution based on Modbus/TCP, introduces in detail the implementation of this solution, takes in-depth research on the communication redundancy and reliability. This solution had eventually been applied to a metro project of a foreign city. The on-site operation results show that the HMI implemented by this solution operates stably, and both the real-time performance and redundancy meet the requirements.
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• Problem of Automatic Trigger Departure Route of CTC in Automatic Interstation Blocking
• Luo Zhigang
• 2022 Vol. 19 (2): 81-84,93. DOI:10.3969/j.issn.1673-4440.2022.02.018
• Abstract ( ) PDF (1162KB)( )
• Aiming at the line with the implementation of automatic interstation blocking based on the 64D semi-automatic block circuit, this paper studies the problem that the starting signal cannot be cleared normally when CTC sets the departure route immediately after the block light is off, analyzes the reasons with respect to CTC system, interlocking system, 64D semi-automatic block circuit and inter system interface, and also puts forward the corresponding solutions.
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• Optimizing Operational Measures of Kunming East Marshalling Yard for "Belt and Road Initiative"
• Huang Xiaodong, Qin Yong
• 2022 Vol. 19 (2): 85-88. DOI:10.3969/j.issn.1673-4440.2022.02.019
• Abstract ( ) PDF (1060KB)( )
• The “Belt and Road Initiative” has put forward the requirements for China’s railways to  ensure the transport efficiency and service quality. Kunming east railway station, as the main station for marshalling operations of Kunming bureau group corporation, has a relatively tight marshalling capacity and cannot guarantee the transport efficiency of freight transportation. Based on the smart management and control system (SAM system), this paper proposes the operation optimization measures of constructing the interstation coordination and mutual protection framework and the early warning mechanism of traffic flow. The proposed optimization measures can further improve the transport efficiency, ensure the service quality and improve the marshaling efficiency of Kunming east railway station.
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• Analysis and Solution of Common Hidden Hazards in Equipment Room of Railway Station and Depot
• Zhang Jinkui
• 2022 Vol. 19 (2): 89-93. DOI:10.3969/j.issn.1673-4440.2022.02.020
• Abstract ( ) PDF (2771KB)( )
• As the information exchange and storage center, the equipment room is the nerve center of railway transportation system. This paper summarizes and analyzes the common safety hazards in the railway station and depot, points out that power supply safety is the basis of the operation of the equipment room information network system and fire safety is the bottom line of safety production. It also puts forward the hazard resolution of human-machine co-disturbation and the application and significance of the signs of equipment room, and the feasibility solution from the thinking of safety bottom line.
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• Fault Analysis on Installation Device of Switch Machine
• Chen Lei
• 2022 Vol. 19 (2): 94-99. DOI:10.3969/j.issn.1673-4440.2022.02.021
• Abstract ( ) PDF (4547KB)( )
• In view of the connecting iron fracture at the connection between the installation device of switch machine and switch rail, the fault cause is analyzed and studied by the method of field test combined with finite element simulation. Through three-dimensional modeling and finite element modal analysis of turnout and switch machine installation device, the results show that the first order modal of turnout and switch machine installation device system is close to the measured response frequency of stock rail on repulsion side. Combined with the modal analysis results and the actual test results, it is concluded that the resonance of switch machine installation device caused by the vibration response of turnout repulsion rail is the main reason for connecting iron fracture. Maintenance suggestions are given according to the fault cause: for ballasted track bed, the turnout traction point shall be maintained regularly to ensure the support stiffness of the track at the traction point and avoid local resonance of turnout system.
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• Scheme of Train Control System for Three Airports High Speed Railway Project in Thailand
• Quan Hongyu
• 2022 Vol. 19 (2): 100-105. DOI:10.3969/j.issn.1673-4440.2022.02.022
• Abstract ( ) PDF (1600KB)( )
• This paper analyzes the selection requirements of the train control system for the three airports high speed railway project in Thailand, puts forward train control system schemes and makes comprehensive selection, and then proposes the recommended scheme of train control system for three airports high speed railway project. The research results can provide a reference for the selection of train control system scheme for overseas projects.
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