基于动态故障树的地铁自动监控系统可靠性分析

Reliability Analysis of Metro Automatic Train Supervision System Using Dynamic Fault Tree

自动监控系统是地铁系统安全运行的重要保障,具有可修性、容错性及冗余性等特点。本文基于动态故障树对广州地铁4号线自动监控系统进行可靠性分析。首先,对系统动态故障树进行模块化;然后,对各个子树模块采用马尔科夫矩阵迭代法计算其稳态可靠性参数;最后,通过参数传递计算系统的稳态可靠性参数。研究分析结果表明,本文采用的可靠性计算方法能够更好地描述系统的冗余性和容错性,提高了可靠性指标的精度,避免了由于系统复杂而造成的状态爆炸问题,提高了可靠性分析的实时性和有效性。

The automatic train supervision(ATS)system is a key guaranty for reliable and safe operation of a Metro system and characteristic of maintainability,fault-tolerance and redundancy.Dynamic Fault Tree Analysis(DFTA)is used to analyze the reliability of the ATS of Guangzhou Metro's Line 4.The dynamic fault tree of the system is modularized and then the steady-state reli-ability parameters of each sub tree module are calculated by Markov matrix iteration method and the steady-state reliability parameters of the system can further be calculated by parameter.transfer.The results show that this reliability calculation method can better describe the redun-dancy and fault tolerance of the system and improve the accuracy of reliability parameters.Mean-while,this method can avoid state explosion caused by the complexity of the system and improve the real-time performance and effectiveness of reliability analysis.