Reliability analysis on ATP system of CTCS-3 based on dynamic fault tree

According to the drawback of traditional methods of reliability analysis describing the dynamic failure problem of the ATP system of CTCS-3,dynamic fault tree was used to analyze the reliability of the system.Firstly,the dynamic fault tree model was established by analyzing the structure and function of the system.Secondly,the depth-first left-most traversal algorithm was used to search on the dynamic fault tree model to obtain the independent subtrees.Finally,after introducing the reliability indexes of repairable system,the analytic method and Markov matrix iteration method were adopted to solve subtrees.The hierarchical iteration method was applied to improve dynamic fault tree analysis method to reduce the quantity of computation so that the reliability indexes could be used for reliability evaluation of the ATP system of CTCS-3.Comparing the results of above method with the results of the reliability block diagram method,it is show that dynamic fault tree analysis can describe the characteristics of redundancy and fault-tolerance of system better and the accuracy of reliability indexes is improved.