考虑状态相依与功能相依的地铁综合监控系统可靠性分析

Analysis on Reliability of Integrated Supervision & Control System of Metro Considering State Dependency and Function Dependency

为研究地铁综合监控系统对系统维修的影响,并考虑当控制器失效时,关于监控对象是否继续工作的不同假设对监控对象可靠性的影响,引入状态相依与功能相依的概念。给出基于Kronecker代数,考虑组件状态相依与功能相依的系统可靠性建模过程,以及可维修系统可靠性指标的计算方法。研究基本结构时考虑状态相依的维修与功能相依的失效对系统可靠性的影响。建立以广州地铁综合监控系统监控对象为研究对象的系统可靠性模型。数值分析结果表明:组件的状态相依与失效相依不会改变监控对象的平均失效间隔时间,但综合监控系统在一定条件下可减少系统的平均维修时间,而考虑失效相依时系统的平均维修时间会小于不考虑失效相依时系统的平均维修时间。

In order to study the influence of the integrated supervision ＆ control system （ISCS） of metro on ma- intenance of the metro system, taking into consideration the influence whether the controlled objects continued working in case of controller failing on the reliability of the controlled objects,the concepts of state dependency and function dependency were introduced. The modeling process of system reliability based on the Kronecker algebra and consideration of state dependency and function dependency of component parts and the method for computing reliability indices of repairable systems were put forward. Reliability of basic system structures was studied considering the influence of maintenance in state dependency and failure in function dependency. The re- liability model of the Guangzhou Metro ISCS was established with the controlled objects of the Guangzhou Met- ro ISCS as the study objects. The numerical results show as follows：State dependency and failure dependency of components will not change the mean time between failures （MTBF）of controlled objects, however, the ISCS may shorten the mean time to repair （MTTR）of the system under certain conditions; the MTTR of the system considering failure dependency is certainly shorter than that without considering failure dependency.