可修系统的可用度分析方法研究

可修系统的可用度分析方法研究
　　介绍了一种新的可修系统可用度分析方法———可修系统动态故障树建模分析方法 .为了获得高的可靠性和可用性 ,计算机控制系统大量采用了动态余度管理、储备及复杂的故障恢复技术 ,使计算机控制系统呈现出很强的动态性和实时性 .采用动态故障树与Markov过程综合方法 ,将计算机控制系统的动态时序用DFTA(DynamicFaultTreeAnalysis)描述 ,将系统可修过程用Markov过程描述 ,将系统分解成若干个小的模块 ,逐步计算各模块的可用度、等效故障概率和维修率 ,最后综合进行整个系统的可用度分析 .
【作者单位】：北京航空航天大学自动化科学与电气工程学院 (孔德良);北京航空航天大学自动化科学与电气工程学院(王少萍)
【关键词】：故障树图形分析;综合定位法;可用性;动态故障树;Markov状态转移链
【基金】：国家自然科学基金资助项目 ( 6980 10 0 1);国家部委基金资助项目
【分类号】：V241
【正文快照】：
　　传统分析可修系统可用度模型为markov过程 ,但是当系统复杂程度增大 ,markov状态转移的路径呈几何倍数增长 ,解微分方程是一个工作量相当大的难题 .本文根据系统的特点 ,设计了动态故障树逻辑门 ,来描述系统动态时序过程 ,并将其转化为相应的markov状态转移

Study on Availability Analysis for Repairable System
KONG De liang WANG Shao ping (Beijing University of Aeronautics and Astronautics;School of Automation Science and Electrical Engineering)
　An availability analysis method for repairable system i.e. Dynamic Fault Tree Analysis(DFTA) was presented .To achieve high reliability and availability, redundant hardware and fault tolerant software associated with dynamic process, time sequence, backup and failure recovery were adopted in the computer control system. Combing DFTA method and Markov model for repairable system, the dynamic process of a fault tolerant system and the repairable process can be easily described. To calculate the equivalent failure rate, recovery rate and availability of top event of a complicated system, it is necessary to divide the system into several subtrees which can treated with Markov model. Recurrent, the availability parameters from top to down can achieve the availability analysis for the complicated system.
【Keyword】：fault tree analysis;combined method;applicability;dynamic fault tree;Markov state transition chain