Research On The Vulnerability Analysis Of Metro System And Simulation Of Equipment System

In recent years,the operating mileage of urban rail transit in China has been increasing,and there are still major safety hazards in the operation process.How to improve the operating safety of the metro system,ensure the stability of the system,and reduce the vulnerability of the system has become one of the issues that need to be solved urgently.Therefore,research on the vulnerability of metros is of great significance.Through a comprehensive analysis of the urban metro system,the vulnerability characteristics of the urban metro system are derived from the network structure and operating characteristics of the urban metro system.The event chain method is used to describe the formation process of metro accidents,and a network model of interference events affecting metro vulnerability is constructed.The topological analysis of complex network characteristic indicators shows that the nodes that can directly affect the vulnerability of the metro system are concentrated.Based on the mutual information theory,the network nodes are evaluated,and the important nodes in the metro interference event network are obtained.The interference events that have a greater impact on the metro system are "train emergency stop","shield door failure","station equipment damage",Equipment status is the main reason for the vulnerability of the metro system.Using system dynamics theory and introducing passenger flow state variables,a dynamic model of the metro equipment system is established.Taking Shijiazhuang Metro as an example,the system status of the equipment is used as an index to evaluate the system's vulnerability,and Vensim-PLE software is used to conduct a dynamic simulation study of the initial operation of the metro system.The simulation results show that the system operation has a high degree of vulnerability.It gradually decreased and stabilized after 4 years.The return on safety investment is generally 3 years later,and it has a significant impact in the later stage of the simulation.Increasing the management effort can effectively control thevulnerability of the equipment system in the early stage of the simulation,properly increase the travel fare,and also reduce the vulnerability of the equipment system.Based on the above research,measures to control the vulnerability of the metro system and related safety recommendations are proposed.