Accelerated Degradation Process Analysis Based on the Nonlinear Wiener Process with Covariates and Random Effects

被引:5
|
作者
Sun, Li [1 ]
Gu, Xiaohui [1 ]
Song, Pu [2 ]
机构
[1] Nanjing Univ Sci & Technol, Nanjing 210094, Jiangsu, Peoples R China
[2] Sci & Technol Combust & Explos Lab, Xian 710065, Shanxi, Peoples R China
关键词
GAUSSIAN PROCESS; OPTIMAL-DESIGN; MODELS; GAMMA; INFERENCE; PRODUCTS;
D O I
10.1155/2016/5246108
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
It is assumed that the drift parameter is dependent on the acceleration variables and the diffusion coefficient remains the same across the whole accelerated degradation test (ADT) in most of the literature based on Wiener process. However, the diffusion coefficient variation would also become obvious in some applications with the stress increasing. Aiming at the phenomenon, the paper concludes that both the drift parameter and the diffusion parameter depend on stress variables based on the invariance principle of failure mechanism and Nelson assumption. Accordingly, constant stress accelerated degradation process (CSADP) and step stress accelerated degradation process (SSADP) with random effects are modeled. The unknown parameters in the established model are estimated based on the property of degradation and degradation increment, separately for CASDT and SSADT, by the maximum likelihood estimation approach with measurement error. In addition, the simulation steps of accelerated degradation data are provided and simulated step stress accelerated degradation data is designed to validate the proposed model compared to other models. Finally, a case study of CSADT is conducted to demonstrate the benefits of our model in the practical engineering.
引用
收藏
页数:13
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