A novel reliability model for multi-component systems subject to multiple dependent competing risks with degradation rate acceleration
A novel reliability model for multi-component systems subject to multiple dependent competing risks with degradation rate acceleration
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DOI：
10.17531/ein.2018.4.9
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Yanjing Zhang;Yizhong Ma;Linhan Ouyang;Lijun Liu
中科院分区：
文献类型：
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作者：
Yanjing Zhang;Yizhong Ma;Linhan Ouyang;Lijun Liu
系统的失效通常是由内部退化或外部随机冲击引起的。由内部退化引起的失效称为软失效，如腐蚀、疲劳、磨损等;硬失效是由外部随机冲击引起的，如器件击穿、短路等。系统中元件的退化过程与到达系统的冲击过程相互竞争。任何一种失效模式的发生都可能导致系统失效。系统随着使用和老化而退化，这是退化的持续积累。然而，硬故障可能会或可能不会发生在其生命周期中。在许多研究中[10，14，28，32]，竞争风险被视为独立的。然而，系统的自然退化过程往往受到冲击载荷的影响。也就是说，到达系统的相同冲击将影响每个组件的退化过程。因此，相互竞争的风险之间的独立性的假设是不合理的，它可能会导致低估或高估的系统可靠性。在建立系统可靠性模型时，考虑多个退化过程与一个冲击过程之间的依赖关系是十分必要的。最近，一些研究人员[5，15]已经考虑到依赖关系来开发系统的可靠性模型。Peng和Feng [20]建立了多个相关竞争风险系统的可靠性模型，其中相关竞争风险指软故障和硬故障。软破坏是由连续的自然退化和随机冲击引起的附加SDI引起的。硬破坏是由冲击过程中的致命冲击载荷引起的。Jiang和Feng [11]提出了系统的可靠性模型
The failure of a system is usually caused by internal degradation or external random shocks. The failure caused by internal degradation is called soft failure, such as erosion, fatigue, wear, etc. And the hard failure is caused by external random shocks, such as device breakdown, short circuit, etc. The degradation processes for components in a system and a shock process arriving at the system compete with each other. The occurrence of any failure mode may lead to the failure of systems. A system deteriorates with its use and age, which is a continuous accumulation of degradation. However, the hard failure may or may not happen in its life cycle. In many studies [10, 14, 28, 32], the competing risks were treated as independent. However, the natural degradation processes of a system are usually affected by the shock loads. That is, the same shock arriving at a system will influence the degradation process of each component. Hence, the assumption of independence between competing risks is not reasonable, and it may cause underestimation or overestimation of the system reliability. It is very necessary to consider the dependence relationship between multiple degradation processes and a shock process when establishing the reliability model for a system. Recently, some researchers [5, 15] have taken the dependence relationship into account to develop the reliability model of a system. Peng and Feng [20] built a reliability model for the system subject to multiple dependent competing risks, where dependent competing risks referred to soft failure and hard failure. Soft failure was caused by continuous natural degradation and additional SDI due to random shocks. Hard failure was induced by fatal shock loads from the shock process. Jiang and Feng [11] proposed a reliability model for a sysYanjing ZhAng Yizhong MA Linhan OuYAng Lijun Liu