Degradation model is the basis for reliability analysis of degraded products.Owing to the problem that the mis-specification of degradation model directly affects the accuracy of reliability assessment,the issue of mis-specif-ying the widely applicable exponential dispersion process model as three commonly used Wiener process model,gamma process model and inverse Gaussian process model was studied.By calculating the relative bias and relative variability,the influence of the model mis-specification was analyzed,and the GaAs laser data was select for exam-ple verification.The results showed that the model mis-specification would have a greater influence on the estimation of the products'average life.Therefore,in the reliability consideration of degraded products,exponential dispersion process model with wider application scope should be selected for modeling analysis.
关键词
模型误指定/指数扩散过程/平均失效时间/伪极大似然估计
Key words
model mis-specification/exponential dispersion process/mean-time-to-failure/quasi maximum likelihood estimation
维普
万方数据