Analysis of Train Signaling System Safety Distance
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 2
Abstract
[Objective] The current calculation of safety distance in the moving block signaling system does not consider adverse working conditions such as faults and low adhesion coefficients, resulting in poor authenticity and low precision in safety distance calculations. It is necessary to study the impact of the aforementioned adverse conditions on the safety distance of train signaling systems. [Method] A safety distance model for the signaling system is established to analyze the main factors affecting train safety distance. Considering train braking systems, longitudinal dynamics, and wheel-rail adhesion conditions, MATLAB/Simulink software is used to build a simulation platform encompassing stages such as on-board ATP (automatic train protection) trigger emergency braking, traction cut-off, coasting, emergency braking establishment, and emergency braking. Combining actual train parameters and relevant standards, simulation studies on the safety distance of signaling systems under conditions of ultra-low adhesion, partial loss of braking force in some vehicles, and different train operating speeds are conducted. [Result & Conclusion] Emergency stopping distance is the key factor affecting the safety distance of signaling system and is related to wheel-rail adhesion conditions, the line maximum allowable operating speed, and potential fault types. Under normal conditions with an adhesion coefficient of 0.03 and a train speed of 120 km/h, the safe distance is 1 520.7 m. In the most unfavorable condition (a faulty heavy-loaded vehicle with other vehicles unloaded, 2 bogies removed), the corresponding safety distance is 2 196.7 m. In practical applications, speed measurement errors and positional uncertainties should be taken into account to leave a certain margin for signaling system safe distance and ensuring train operation safety.
Authors and Affiliations
Wenjie HUANG, Yanli YAN, Tianhe MA, Gengwei ZHAI
Keywords
Related Articles
- EP ID EP730081
- DOI 10.16037/j.1007-869x.2024.02.016
- Views 35
- Downloads 0
Optimization of Interface Content between Shanghai Rail Transit Audio Video Unified Information Service System and Signaling System
Objective To improve the real-time, accuracy, and efficiency of information services, and enhance the operational service efficiency and quality of Shanghai rail transit, it is essential to optimize the interface content...
Performance Evaluation of Rail Transit Station Land Use Based on Passenger Throughput-A Case Study of Shanghai
Objective Shanghai Master Plan (2017-2035) evaluates land use performance using the index of land use area for construction of GDP per unit area across the city. However, since rail transit stations are more concerned wi...
Dynamics Response Simulation Analysis of Underground Space Semi-suspended Lanes under Double-decker Vehicle Loads
Objective The new prestressed hanging wall semi-suspended lane structure in underground complex offers advantages of aesthetic appearance and large clearance. However, the research on the mechanical properties of the new...
Decentralized Split Evaporative Condensation Refrigeration System for Metro Stations
[Objective] Evaporative condensation refrigeration systems are characterized by energy efficiency, water conservation, space savings, not requiring ground cooling tower installations. The application of evaporative conde...
Overview of Rail Potential Suppression Technology in Urban Rail Transit Running Rail Circuit Return System
Objective In the DC (direct current) traction power supply system of urban rail transit, excessive rail potential and stray current issues are persistent problems and common ailments for operational routes. Therefore, it...