城市轨道交通信号系统脆弱性分析方法研究

Vulnerability Analysis Method of Urban Rail Transit Signal System

城市轨道交通信号系统在风险、可靠性和安全评价等方面的研究很多,在脆弱性方面的研究较少。笔者通过建立城市轨道交通信号系统面向对象的Petri网模型,提出信号系统脆弱性的定量分析方法。首先,提出了城市轨道交通信号系统的脆弱性概念,辨识了信号系统脆弱性程度的影响要素。其次,依据某地铁对信号设备的运营维护分工,把信号设备按照空间布局分为正线轨旁类信号设备、车载类信号设备、控制中心类信号设备和车辆段类信号设备,采取基于对象的有色Petri网(Objects Oriented Colored Petri Net,OOCPN)方法为信号系统建立分析模型,并利用OOCPN运行特征提出脆弱性影响要素的攻击路径搜索算法。最后,阐述了信号系统脆弱性分析的量化计算方法与步骤,并进行了实例验证,实现信号系统的脆弱性量化分析。

There are many researches on the risk,reliability and safety evaluation of urban rail transit signal system,but few on the vulnerability.By establishing the object-oriented Petri net model of urban rail transit signal system,the quantitative analysis method of signal system vulnerability is proposed.Firstly,the concept of vulnerability of urban rail transit signal system is proposed,and the influence factors of vulnerability degree of signal system are identified.Secondly,according to the operation and maintenance division of a certain subway to signal equipment,the signal equipment is divided into positive line rail type signal equipment,vehicle type signal equipment,control center type signal equipment and vehicle segment signal equipment according to space layout,and the Objects Oriented Colored Petri Net(OOCPN)square based on object is adopted.The method establishes an analysis model for the signal system,and proposes an attack path searching algorithm for vulnerability impact factors by using OOCPN operation features.Finally,the quantitative calculation method and steps of signal system vulnerability analysis are described,and an example is given to verify the method.