具有退化和随机冲击的系统可靠性评估

Yu Liu, Hongzhong Huang, H. Pham
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引用次数: 31

摘要

本文提出了一种多部件退化系统的可靠性评估模型,该系统具有两种相互竞争的失效原因:内部退化过程和外部随机冲击。将内部退化表示为与工作时间有关的随机过程,并采用几何过程来描述外部随机冲击引起的累积损伤。在我们提出的模型中,假设系统在内部退化或随机冲击的累积损伤超过随机寿命阈值时失效。在考虑随机寿命阈值和退化过程服从威布尔分布的情况下,导出了可靠性表达式。以串并联系统为例,给出了简化基于正态逼近的计算过程和系统可靠性评估的数值算法。最后,采用蒙特卡罗仿真方法对模型和算法进行了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reliability evaluation of systems with degradation and random shocks
This paper introduces a proposed model to evaluate the reliability of multi-component degradation systems suffering two kinds of competing failure causes: internal degradation process and damage from external random shocks. The internal degradation is expressed as a random process with respect to working time, and a geometric process is employed to describe cumulative damage caused by external random shocks. In our proposed model, the system is assumed to be failed when internal degradation or cumulative damage from random shocks exceed random life thresholds. The reliability expression is derived when the random life threshold and degradation process are considered to follow a Weibull distribution. A studied case of series-parallel system is presented to illustrate the proposed model, and a numerical algorithm is provided to simplify the calculating process based on normal approximation and assess the system reliability. Finally, Monte Carlo simulation method is employed to verify the model and algorithms.
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