考虑阶段备份的多态多阶段任务系统可靠性建模方法
Science Technology and Engineering（2023）
太原理工大学 | 中国航天标准化与产品保证研究院 | 电子科技大学
Abstract
近些年来,由于在航空航天、分布式计算以及核电系统等系统中广泛的应用,多阶段任务系统(phased mission system,PMS)可靠性理论与方法得到了广泛的关注与研究.在现代航天系统,尤其是载人航天系统,为了使整个系统的任务可靠性更高,经常会采用任务备份的方法来提高系统的任务可靠性.针对该类型的问题,提出一种基于多态多值决策图(multistate multi-valued decision diagram,MMDD)的方法.首先,将阶段故障树模型转化为阶段模型,其次,根据阶段代数方法将阶段模型融合为系统模型.在阶段模型融合过程中,通过增加随机变量的方法对单元经历的阶段进行统计,从而实现降低所建立的系统模型大小,提高建模效率,并以某型航天器推进子系统为例对建模方法进行说明.
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