基于DFTA的地铁车站级综合监控系统可靠性分析

地铁综合监控系统是整个地铁系统可靠安全运行的重要保障,由于其具有可修性、功能相关性、顺序相关性、容错性及冗余性等特点,本文采用动态故障树分析法(DFTA)对其进行可靠性分析。在引入新的动态可靠性指标的基础上,采用直接计算法和Markov矩阵迭代法求解,最后引入分层迭代方法对DFTA进行改进,可减小运算量,使得这些动态指标可应用于地铁综合监控系统整个动态故障树的可靠性评估。本文建立某典型地铁综合监控系统的车站级综合监控系统(SMCS)及其3个子系统的DFTA模型,研究3个子监控系统互联对整个车站级监控系统可靠性的影响。研究分析结果表明,动态故障树分析法在对地铁综合监控系统可靠性的分析中能够考察各子系统互联对系统可靠性的影响,具有较强的实用性。

Analysis on Reliability of the Subway Station-level Integrated Supervisory and Control System Based on Dynamic Fault Tree Analysis

The integrated supervisory and control system of the subway is the substantial guarantee of reliable and safe operation of the subway system.Due to the fact that the integrated supervisory and control system possesses the characteristics of maintainability,functional dependency,sequential dependency,fault-tolerance and redundancy,Dynamic Fault Tree Analysis(DFTA) is made to analyze the reliability of the system.Introducing in new dynamic reliability indexes,the direct calculation method and Markov matrix iteration method are adopted to find solution.The hierarchical iteration method is used to improve the DFTA model to reduce the quantity of calculation so that the dynamic reliability indexes may be applied in evaluation of the reliability of the dynamic fault tree of the system.The DFTA model of the Station Main Control System(SMCS) and its three sub-systems of a typical integrated supervisory and control system of the subway is established,the influence of the interconnection of the three sub-systems on SMCS is studied.The analysis results show that DFTA has good practicability as it is able to study the influence of the interconnection of the sub-systems on the reliability of the entire system in analysis of the reliability of the integrated supervisory and control system of the subway.