城市轨道交通网络级联失效机理研究

Cascading Failure Mechanism of Urban Rail Transit Network

城市轨道交通网络具有复杂网络的基本特性,车站和线路之间紧密联系,当节点发生故障时,网络会因为级联失效行为而产生较大范围的拥堵影响。本文结合城市轨道交通网络的特性,对城市轨道交通网络级联失效现象进行分析,定义出行时间费用,考虑拥堵对出行路径选择和流量重分配的影响,在此基础上建立城市轨道交通网络级联失效的模型,仿真级联失效的过程。并以成都市轨道交通网络为例进行实证研究,分析不同初始节点失效情况下轨道交通网络级联失效的规模差异。研究结果对轨道交通的合理规划和应急管理等有重要参考意义。

Because the urban rail transit network has the basic characteristics of complex network,stations and lines are closely linked.When there is one node fails,the network will cause a large range of congestion impact due to cascading failure behavior.Combined with the characteristics of urban rail transit network,this paper analyzes the cascading failure phenomenon of urban rail transit network,defines the cost of traveling time,considering the impact of congestion on travel path selection,and then affects the redistribution of traffic flow.On this basis,the cascading failure model of urban rail transit network is established,and the process of cascading failure is simulated.Finally,taking Chengdu rail transit network as an example,this paper analyzes the scale differences of cascading failures of different initial failure nodes.The research results have important reference significance for the rational planning and emergency management of rail transit.