Health evaluation method for degrading systems subject to dependent competing risks

作     者：ZHAO Shuai MAKIS Viliam CHEN Shaowei LI Yong 

作者机构：School of Electronics and Information Northwestern Polytechnical University Department of Mechanical and Industrial Engineering University of Toronto 

出 版 物：《Journal of Systems Engineering and Electronics》 (系统工程与电子技术（英文版）)

年 卷 期：2018年第29卷第2期

页      面：436-444页

核心收录：

学科分类：0711[理学-系统科学] 070208[理学-无线电物理] 07[理学] 071102[理学-系统分析与集成] 0702[理学-物理学] 

基　　金：supported by the Aeronautical Science Foundation of China(20155553039) the Natural Sciences and Engineering Research Council of Canada(RGPIN 121384-11) 

主　　题：competing risk conditional mean residual life health evaluation non-stationary Gamma process proportional hazards model 

摘      要：This paper proposes a health evaluation method for degrading systems subject to competing risks of dependent soft and hard failures. To characterize the time-varying degradation rate, the degradation process is determined by a non-stationary Gamma process and the soft failure is encountered when it exceeds a predefined critical level. For the hard failure, a Cox’s proportional hazard model is applied to describe the hazard rate of the time to system failure. The dependent relationship is modeled by incorporating the degradation process as a time-varying covariate into the Cox’s proportional hazard model. To facilitate the health characteristics evaluation, a discretization technique is applied both to the degradation process and the monitoring *** health characteristics can be obtained in the explicit form using the transition probability matrix, which is computationally attractive for practical applications. Finally, a numerical analysis is carried out to show the effectiveness and the performance of the proposed health evaluation method.