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针对多阶任务系统中考虑共因失效后,系统的阶段依赖性和共因失效而增加了系统可靠性分析的复杂度,采用分析显式和隐式方法存在不足的问题,提出了一种基于二元决策图考虑共因失效的故障树可靠性分析方法.该方法首先忽略共因失效情况下的故障树并将其转化为多阶段任务系绕的二元决策图(PMS-BDD),求出系统的不可靠度表达式;然后,通过隐式方法将该表达式转化成包含共因失效信息的不可靠度或可靠度表达式,并依据求得的表达式进行相应的可靠性分析.研究结果表明:该算法与显示式算法的结果相同.该研究结论为多阶任务系统可靠性分析提供一种更加简便方法.
Aiming at the problem of system reliability analysis after multi-order task system considering common-cause failure, the system’s phase dependency and common-cause failure, this paper presents a new method based on the analysis of explicit and implicit methods, Binary decision diagram Considering the fault-tree reliability analysis method of common cause failure, this method first ignores the fault tree under the common-cause failure condition and transforms it into the binary decision diagram (PMS-BDD) around the multi-stage task. Then the implicit method is adopted to convert the expression into an unreliability or reliability expression containing common cause failure information, and the corresponding reliability analysis is performed according to the obtained expression. The results show that the algorithm has the same result as the display algorithm, and the conclusion of the research provides a more convenient method for the reliability analysis of multi-task system.