基于二元决策图的多阶段任务系统可靠性分析

摘要

分析了多阶段任务系统(PMS)可靠性分析中传统二元决策图(BDD)建模方法的不足,提出了一种将多阶段任务失效事件分解为互不相容的阶段失效事件,然后分别建立可靠性BDD模型的新方法.通过该方法建立的PMS可靠性BDD模型不但可以计算总体任务失效概率,同时也能计算任务在各阶段发生失效的概率.最后,给出了一个算例,验证了该算法的有效性.%In view of defects in the traditional binary decision diagram (BDD) models for reliability a-nalysis of phased mission system (PMS),this paper proposes a new BDD-based method for PMS reliability analysis.By this method,the mission failure can be decomposed to several inconsistent phase failures,so as to establish a phase failure BDD model.The BDD model can be used to calculate not only the probability of mission failure,but also the probability of mission failing in each phases.Finally,an example is given to verify the effectiveness of the method.