列车组合测速系统安全完整性分析

Analysis of the Safety Integrity in Integrated Train Speed Measurement System

采用编码里程计及多普勒雷达进行组合测速,描述了列车组合测速平台的主要结构,提出了利用卡尔曼滤波残差字2来检测列车空转/打滑故障的方法。采用故障树分析法对列车组合测速系统进行了故障分析,并对其故障树进行重构,根据实际参数对组合测速系统危险侧失效率进行了计算。计算结果证明,利用多普勒雷达补偿列车空转/打滑,列车组合测速系统的安全完整性符合SIL 4等级。

Coded odometer and Doppler radar are used tomeasure the train speed,and the main structure of the trainspeed measurement platform is described.Then,Kalman filteringresidualsχ2is proposed to detect train sliding/slippingphenomenon,FTA method is used to conduct the failure analysisof the proposed system.The fault tree of the integratedsystem is reconstructed and the failure rate of the dangerousside is calculated according to the actual parameters.The resultsverify that safety integrity of train speed measurement fitsin with SIL4security level by using Doppler radar to compensatethe errors caused by train idling and slipping.