随机冲击下多相关退化的竞争失效可靠性模型

Competition Failure Reliability Model for Multi-Correlation Degradation Under Random Shock

针对伴随随机冲击及多性能退化的系统,在假设性能退化过程均为线性退化过程、冲击过程为极值冲击模型的基础上,引入Copula的相关理论。考虑多性能退化模式之间的相关性,分析了性能退化对突发失效阈值的影响,建立了系统的可靠度评估模型,并给出了时变相关性拟合Copula模型选择方法。算例结果表明了模型的有效性与工程可操作性。

For the systems with random impact and multi-performance degradation,the theory of Copula was introduced on the assumption that the performance degradation process is a linear degradation process,and the impact process is an extreme impact model.Considering the correlation between multi-performance degradation modes,the influence of performance degradation on the burst failure threshold was analyzed,and the reliability evaluation model of the system was established.The selection method of dynamic correlation fitting Copula model was given.The example shows the effectiveness and engineering operability of the model.