阶段一致型阶段任务系统最优变量排序研究

Best variable ordering for homogeneous phased mission system

为缩小二进制决策图(BDD)模型的尺度,提高阶段一致型阶段任务系统(PMS)可靠性分析的准确性,对阶段一致型PMS的最优变量排序问题进行了研究。利用已有的阶段依赖排序(PDO)方法,基于不同的阶段组合关系,研究PMS故障树最优变量排序和PDO之间的关系。结果表明:阶段一致型PMS具有前向PDO适用于阶段与组合PMS,后向PDO适用于阶段或组合PMS的特性;将PMS故障树排序问题规约为一般故障树变量排序问题。

To reduce the size of binary decision diagrams（ BDD） and improve the accuracy of reliability analysis of large-scale homogeneous phased mission system（ PMS）,best variable ordering for homogeneous PMS is researched. The relation between the best variable ordering of PMS fault trees and phase dependent ordering（ PDO） is studied by using PDO and based on different combination logic among phases. The results show that forward PDO is fit for phase-and PMS and backward PDO is fit for phase-or PMS,and the PMS variable ordering problem is transformed into the traditional variable ordering problem.