• Research on ETCS Baseline 3 ATP Brake Deceleration Conversion Model
• Long Shidan
• 2022 Vol. 19 (6): 1-4. DOI:10.3969/j.issn.1673-4440.2022.06.001
• Abstract ( ) PDF (1719KB)( )
• ETCS baseline 3 is currently the most complete European train control system specification, which describes the general train control system ATP brake curve model. This paper studies the calculation method of brake deceleration based on conversion model, analyzes the influencing factors and changing rule of brake deceleration, and provides effective support for the use of ETCS baseline 3.
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• Formal Modeling and Verification of Point Control System Based on Method B
• Liu Ning, Han Cheng, Wang Zheng, Hou Xili, Wang Keming
• 2022 Vol. 19 (6): 5-11. DOI:10.3969/j.issn.1673-4440.2022.06.002
• Abstract ( ) PDF (1740KB)( )
• In order to solve the realistic problems such as that the current mainstream validation method for safety critical system cannot prove whether the system exists defects, this paper researches to set up a formalized model for software function logic to achieve the verification of software requirements specification, and finally generate code C by taking the point control system for trackside equipment interlocking control as the specific research object, according to the software requirements specification, aiming at the safety point control system function, and using formal approach to software development method (method B). The research shows that the code C automatically generated by formal model can run normally and meet the software requirements of point control system after passing the verifications of automatic machine proof and manual interactive proof. In this paper, the formal method is applied to the whole process of software development of point control system, the technical route and development method used can effectively improve the safety and reliability of point control system, and reduce the workload in the coding stage, which has important reference significance to the development of other safety critical systems.
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• Discussion on Electronic Relay Interface of ZPW-2000 Series Jointless Track Circuit
• Li Wentao, Yang Jin, Qiu Zhibin
• 2022 Vol. 19 (6): 12-16,27. DOI:10.3969/j.issn.1673-4440.2022.06.003
• Abstract ( ) PDF (1408KB)( )
• This paper analyzes the current situation of relay interface of ZPW-2000 series jointless track circuit according to the objective problems such as the development demand of electronic railway equipment and the on-site complexity of faults. It is clear that the track circuit direction switching circuit and its relay have electronic conditions under the communication control mode. The direction relay and track relay under relay control mode do not have electronic conditions because they are deeply involved in self-stick and interlocking circuits. The paper proposes to realize the electronization of relay interface by upgrading track circuit related equipment, which can effectively improve the efficiency of fault diagnosis and promote the electronization process of railway basic equipment.
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• Research on Track Line Fitting Method Based on Multi-track Refinement
• Huang Xiaofei, Jin Yanwei
• 2022 Vol. 19 (6): 17-22. DOI:10.3969/j.issn.1673-4440.2022.06.004
• Abstract ( ) PDF (1854KB)( )
• In order to generate high-precision electronic map of railway track to record the line evaluation status and reduce the intensity of outdoor operation, Global Positioning System (GPS) is used to measure the same railway line several times and the measured data points were transformed into Gaussian plane coordinates through coordinate transformation. Then, the outliers of the measured data points are eliminated by Hough transform, and the errors of the multiple measured data points after outliers elimination are corrected by the idea of average elimination to obtain accurate GPS measured data points Finally, the least-squares method is used to perform trajectory fitting on the accurate GPS measured data points to obtain the railway line trajectory map expression. This paper analyzes and verifies the measured line data by this method and the results show that the trajectory map generated by this method is not only has accurate trajectory fitting and high positioning accuracy, but also has high theoretical value and practical application prospect.
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• Research on Technical Scheme of Train Integrity Inspection Based on Beidou Satellite
• Fan Kai, Zhang Miao, Teng Da, Feng Haonan, Duan Hongwei
• 2022 Vol. 19 (6): 23-27. DOI:10.3969/j.issn.1673-4440.2022.06.005
• Abstract ( ) PDF (1162KB)( )
• This paper summarizes the new requirements for the development of China's railway signaling system, analyzes the integrity inspection requirements of the next generation train control system based on the introduction of the existing train integrity inspection program, proposes a technical scheme for train integrity inspection based on Beidou satellites and carries out the preliminary design for the system. On the basis of the scheme, the paper also analyzes the risk of the system by FMECA method. The train integrity inspection scheme based on Beidou satellite can not only solve the problems of the existing scheme, but also meet the new requirements of the development of China's railways for the next generation train control system.
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• Design of Protection Section of High-speed Railway Station
• Li Juan
• 2022 Vol. 19 (6): 28-33. DOI:10.3969/j.issn.1673-4440.2022.06.006
• Abstract ( ) PDF (1399KB)( )
• For high-speed railway lines with different speeds, through the analysis of platform size and the setting of walking ladder, this paper determines the calculation method and the minimum value of the distance between insulation joint at the protection section and platform end. At the same time,  combined with the current railway specifications and technical standards, the paper analyzes and compares the design methods among the protection section, outbound signal and outbound transponder group of the typical station and the long track station, so as to obtain a design scheme of the protection section at the station under different conditions, which provides a reference for similar engineering design.
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• Research on Train Operation Mode of Hefei South EMU Workshop
• Xie Feng
• 2022 Vol. 19 (6): 34-39. DOI:10.3969/j.issn.1673-4440.2022.06.007
• Abstract ( ) PDF (1162KB)( )
• According to the requirements of Tieanjian No.126 [2020], aiming at the effective track length and train operation organization status of Hefei South depot, this paper analyzes the feasibility of transforming the shunting mode of Hefei South EMU depot into CTCS-2 train mode by studying the relationship among the EMU reliable start and stop and the balise, stop sign within the station track and the EMU onboard safety protection distance under different train operation organizations, which provides reference for the selection of the following new EMU depot location, the setting of the effective track length and the engineering design of the train operation organization mode.
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• Analysis of Impact of Interlocking Logic Due to Installation Additional Signal on Double Crossover
• Li Caixia, Chen Xiaozhou, Wang Yanqin
• 2022 Vol. 19 (6): 40-43. DOI:10.3969/j.issn.1673-4440.2022.06.008
• Abstract ( ) PDF (1245KB)( )
• Based on the operational needs of shunting operation at interlocking station, it is more and more common to set shunting signals in the intrusion insulation section of railway crossover. The shunting signal interlocking logic at the intrusion insulation cannot be covered by the general interlocking logic. Combined with the line scenario and the problems encountered in the interlocking logic design in the actual project implementation process, this paper analyzes the influence of the interlocking logic in the scenario, designs and explains the special interlocking logic involved.
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• Research on Train Number Technique for Centralized Traffic Control System
• Wei Xiaofeng
• 2022 Vol. 19 (6): 44-49,63. DOI:10.3969/j.issn.1673-4440.2022.06.009
• Abstract ( ) PDF (1500KB)( )
• Train number is an important basic information for Centralized Traffic Control System to realize dispatching, train running tracking, automatic time collection, automatic arrangement of routes, wireless route announcement and wireless dispatching commands, which shall be timely and accurate. Based on research on train number technique for CTC, this paper analyzes the display of train number, the setting of train number window, the source and priority of train number, the data structure and data flow of train number, and the working principle of train number, and puts forward a proposal for optimizing the priority of train number, which solves the problem of cross-office turn-back and train number tracking among different equipment suppliers, effectively avoids the error of train number tracking and improves the accuracy of train number tracking.
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• Communication Method between CTCS-1 Radio Transmission Unit and Main Control Unit Based on MVB Bus
• Sun Erjing, Wu Peidong, Zhang Zhenxing
• 2022 Vol. 19 (6): 50-53,90. DOI:10.3969/j.i10.3969/j.issn.1673-4440.2022.06.010ssn.1673-4440.2022.06.010
• Abstract ( ) PDF (1295KB)( )
• This paper introduces a communication method between CTCS-1 Radio Transmission Unit and Main Control Unit based on MVB bus, introduces in detail the definition of communication protocol field in this communication method, the data exchange process between CTCS-1 Radio Transmission Unit and Main Control Unit, and the respective work flow of CTCS-1 Radio Transmission Unit and Main Control Unit in data interaction process. According to this communication method, CTCS-1 Radio Transmission Unit and Main Control Unit can efficiently and accurately achieve data interaction.
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• Optimization Scheme of Communication Network for Beijing-Guangzhou Line
• Zhao Yunhai
• 2022 Vol. 19 (6): 54-58. DOI:10.3969/j.issn.1673-4440.2022.06.011
• Abstract ( ) PDF (1659KB)( )
• This paper studies and discusses the current status of services and equipment such as power supply system, data network, transmission network, and access network of Beijing-Guangzhou line, and proposes different optimization schemes for different types of services. Overdue service equipment is disabled, key service channels involving optical cables, power supply, transmission, data and other networks are rationally optimized and shared  on two sets of equipment, so as to achieve the four dual goals of dual power supplies, dual devices, dual paths and dual systems and ensure the maximum reliability of service carrying.
  
  
  
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• Networking Scheme of Railway 5G-R Wireless Access Network
• Ge Weitao, Feng Jingran, Zhou Min, Yang Qi, Li Minxuan
• 2022 Vol. 19 (6): 59-63. DOI:10.3969/j.issn.1673-4440.2022.06.012
• Abstract ( ) PDF (1300KB)( )
• The construction standards of conventional and high speed railways are different, and the coverage schemes of 5G-R are also different. Aiming at different scenarios such as conventional railway and high speed railway, this paper studies the networking scheme of 5G-R wireless access network in tunnel and non-tunnel areas along the railway lines, respectively analyzes the advantages and disadvantages of the two schemes with and without bridge, and proposes the scheme for reference for railway 5G-R network planning.
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• Design Scheme of Ticketing and Reservation System for International Railway
• Feng Yunjie
• 2022 Vol. 19 (6): 64-68. DOI:10.3969/j.issn.1673-4440.2022.06.013
• Abstract ( ) PDF (998KB)( )
• Based on the technical scheme of passenger ticketing system that has been successfully implemented in China-Laos Railway, this paper researches on the scheme, system architecture and adaptive application of international railway ticketing and reservation system in terms of technical requirements and other aspects, puts forward the solutions for the application of international railway ticketing and reservation system from three aspects: system function, system architecture and international business,  and proposes the suggestions on data interconnection of international railway ticketing and reservation system.
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• Engineering Network Design of Railway Information System Based on K8S Platform
• Wang Huawei
• 2022 Vol. 19 (6): 69-75. DOI:10.3969/j.issn.1673-4440.2022.06.014
• Abstract ( ) PDF (1436KB)( )
• With the development of information technology, the demand for information system in railway industry is rising rapidly, and the cost of system operation & maintenance and equipment is also increasing continuously. The application of cloud platform and virtualization technology has improved this situation, but compared with container technology, there are still disadvantages such as high performance loss, high construction cost, slow application release and so on. Combined with the characteristics of railway information system, this paper studies and expounds the network design of K8S (Kubernetes), which is the best container technology, and puts forward solutions to technical difficulties such as high availability, self-repair, service discovery and interface with external system, proposes a solution to the engineering concerns such as the high availability of service, automatic service recovery, service discovery, network interface between the service in the container and the external network system.
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• Optimization Scheme of Train Turn-back Capacity of Urban Rail Transit
• Ma Chong
• 2022 Vol. 19 (6): 76-80. DOI:10.3969/j.issn.1673-4440.2022.06.015
• Abstract ( ) PDF (1223KB)( )
• From the perspective of signaling system, this paper analyzes the influencing factors of turn-back interval of turn-back stations, studies the optimization scheme of improving turn-back capacity of turn-back stations, and puts forward specific measures such as optimizing the running time of train entering the station and entering & leaving the turning track, shortening turn-back end-changing time, and improving the operation proficiency of operators. Through practical engineering application and field test, the optimization scheme is verified, and the target of 2 minutes minimum operation interval and 10% margin for signaling system under typical station is realized.
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• Design of Underlying Frame Based on FAO Simulation Test System
• Yuan Chongyang
• 2022 Vol. 19 (6): 81-86,95. DOI:10.3969/j.issn.1673-4440.2022.06.016
• Abstract ( ) PDF (1836KB)( )
• This paper introduces an underlying support framework applied to a fully automatic operation (FAO) simulation test system. It mainly analyzes the principle of the framework from three aspects: communication design, component design and application design. This solution is based on distributed technology and object-oriented modeling. A reusable underlying network management module is designed, and a message division mechanism is used to design a clear division of processing components. This design has two advantages: one is to solve the problem of too many devices in FAO simulation test system and too frequent communication resulting in insufficient machine performance, and the other is to test different scenarios at the same time to improve efficiency. The application program is developed according to underlying framework, and a semi-physical simulation test system is designed and built, and the system test task of Tianjin FAO test line has been successfully completed.
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• Improved Image Grayscale Matching Method
• Tong Wei
• 2022 Vol. 19 (6): 87-90. DOI:10.3969/j.issn.1673-4440.2022.06.017
• Abstract ( ) PDF (1536KB)( )
• When the metro train is operating under FAO mode, obstruction detection system is an effective auxiliary device . This paper proposes a method of balancing among scale-invariant, rotate-invariant and system real-time, so as to ensure machine vision system to efficiently complete image grayscale matching, which can be applied to the image analysis of obstruction detection device.
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• Design and Realization of Maintenance Management Model for Faulty Parts
• Chong Li
• 2022 Vol. 19 (6): 91-95. DOI:10.3969/j.issn.1673-4440.2022.06.018
• Abstract ( ) PDF (1206KB)( )
• For the problems existing in the daily management of faulty parts, this paper summarizes the defects of traditional management methods of faulty parts, and proposes to create a new management method by means of information technology. Through the analysis of the key role (relationship of process domain and business logic) involved in the maintenance process of faulty parts, the paper designs a maintenance management model of faulty parts which fits the on-site work scenario to realize the whole process control of the maintenance and reuse of the faulty parts, and achieve the goal of reducing cost and increasing efficiency. Finally, through the application of the management model, the faulty parts management platform is established to verify whether the designed maintenance management model of faulty parts is practicability and maneuverability.
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• Solution to Indication Failure of Long-distance Three-phase AC Switch
• Zeng Kezhi
• 2022 Vol. 19 (6): 96-100,116. DOI:10.3969/j.issn.1673-4440.2022.06.019
• Abstract ( ) PDF (1262KB)( )
• When the long-distance three-phase AC switch disconnects control wire X1 in the outdoor switch box, the indoor indication relays of switch are prone to failures that cannot be reliably released. Combined with the engineering case, this paper analyzes the cause of the failure through the principle of switch control circuit, and puts forward the scheme of independent station, the scheme of main station + substation, the scheme of dividing the control cable and the ditch, and the scheme of dividing the control cable and the indication cable, and analyzes the advantages and disadvantages of schemes, gives the corresponding project implementation suggestions, which provide technical reference for the follow-up long-distance three-phase AC switch control.
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• Case Analysis of Emergency Brake of EMU in ZPW-2000R Track Circuit Tuning Area
• Wang Rongguang
• 2022 Vol. 19 (6): 101-106. DOI:10.3969/j.issn.1673-4440.2022.06.020
• Abstract ( ) PDF (1595KB)( )
• Through in-depth analysis of an emergency brake fault of EMU in ZPW-2000R track circuit tuning area for the first time within the control area, and the analysis and calculation of ATP data and the data obtained from actual test of simulated train running on site for verifying each other, this paper investigates the causes of abnormal brake caused by too slow vehicle speed in the tuning area. On the other hand, by compared the structural differences between ZPW-2000A and ZPW-2000R track circuits, the paper proposes solutions to avoid the recurrence of similar failures and ensure the safety of rail transport.
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• Analysis of Ballast Resistance and ZPW-2000G Track Circuit Setting
• She Dingguo
• 2022 Vol. 19 (6): 107-111. DOI:10.3969/j.issn.1673-4440.2022.06.021
• Abstract ( ) PDF (1124KB)( )
• ZPW-2000 series track circuit is more and more widely used in railway signaling equipment, and its requirements for working environment are higher than that of 25 Hz track circuit. According to the problems exposed in the use of ZPW-2000 track circuit, the mismatch between track bed and track circuit is very difficult to solve after the equipment is put into operated. At the initial stage of construction, the layout of track circuit is not adjusted according to the actual situation of track bed, which will leave a lot of hidden dangers for later maintenance. This paper analyzes the setting of ZPW-2000G track circuit from the perspective of the preliminary investigation and later commissioning of the additional second line of Chongqing-Huaihua railway, so as to provide valuable experience for the application and maintenance of section track circuit, and solve the problems of dynamic adjustment and non one-time adjustment of track circuit.
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• Research on Problem of Two Main Disconnections in Neutral Section
• Gao Xinjun, Wang Yang, Zhou Yongjian, Huo Liming
• 2022 Vol. 19 (6): 112-116. DOI:10.3969/j.issn.1673-4440.2022.06.022
• Abstract ( ) PDF (1322KB)( )
• In view of the EMU with CTCS3-300S on-board ATP that has the problem of two disconnections in neutral section  found during integrated commissioning and test (ICT) of signaling system, this paper carries out a multi-angle study in combination with the interpretation of the principle in neutral section, the cause of test problem, and the discussion of industry standards. In the end, the paper identifies the cause of the problem, and considers the method of ICT and the source of design specification.
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• Design Idea of Solving Problem of Water Accumulation in Foundation Pit of Rail Transit Switch Machine
• Tan Rensheng, Yang Zhi, She Lujun
• 2022 Vol. 19 (6): 117-120. DOI:10.3969/j.issn.1673-4440.2022.06.023
• Abstract ( ) PDF (1190KB)( )
• Switching machine is one of the important basic signal equipment, which is used to switch and lock the point, and directly related to safety operation. The problem of water accumulation in foundation pit of switch machine has always been one of the thorny problems in rail transit engineering, which must be paid attention to. By analyzing the source of the problem, this paper puts forward that the interface between specialties shall be carried out from the beginning of the design stage, and the feasible construction scheme shall be selected according to different conditions.
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