城市轨道交通列车关键子系统的安全完整性等级分析

Analysis on Safety Integrity Level of Urban Rail Transit Train Key Subsystems

合理确定城市轨道交通各专业设备系统的SIL(安全完整性等级)、避免刻意追求安全功能造成资源浪费是非常必要的。针对列车客室侧门、网络控制、空气制动等关键子系统发生故障可能会导致乘客碰撞、夹伤、摔伤甚至死亡的安全事故,对影响乘客安全的列车安全功能进行评估。从列车各关键子系统的安全功能角度出发,在介绍HAZOP(危险与可操作性分析)风险识别方法的基础上,阐述了SIL的划分及其评估方法。以南宁轨道交通4号线列车为例,将该SIL评估方法应用到实际的工程项目中,合理确定该车型各子系统的SIL。

It is necessary to reasonably determine the SIL(safety integrity level)of professional equipment systems of urban rail transit and to avoid the waste of resources caused by deliberate pursuit of safety functions.In view of accidents that may result in collision,entrapment,fall or even death of passengers due to faults of key subsystems such as train passenger compartment doors,network control and air braking,the safety functions of train that affect passenger safety are evaluated.From the perspective of the safety function of various key subsystems of the train,based on the introduction of risk identification method of HAZOP(hazard and operational analysis),the division of SIL and its evaluation method are expounded.Taking the train of Nanning Rail Transit Line 4 as an example,the SIL evaluation method is applied to actual engineering project to reasonably determine the SIL of each subsystem of the train.