Reliability modeling for systems subject to multiple dependent competing failure processes with shock loads above a certain level

被引:87
作者
An, Zongwen [1 ]
Sun, Daoming [1 ]
机构
[1] Lanzhou Univ Technol, Sch Mechatron Engn, Lanzhou 730050, Peoples R China
基金
中国国家自然科学基金;
关键词
Reliability model; Certain level; Shock threshold; Explicit relationship; Dependence; Copulas; DEGRADATION; PRODUCTS;
D O I
10.1016/j.ress.2016.08.025
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Considering that products with high reliability have ability to resist small shock loads, a new reliability model is proposed for system experiencing dependent competing failure processes(DCFP) with shock loads above a certain level. Such shock loads are separated by the shock threshold, beyond which are fatal shocks causing sudden failure of systems. The remaining part between the certain level and shock threshold are general shock loads causing sudden degradation increments (SDI). Moreover, an explicit relationship between SDI and the magnitude of shock loads is established for reliability assessment. In this study, we consider two kinds of DCFP: (1) a shock process and a degradation process; (2) a shock process and multiple degradation processes. In case (1), we consider the dependence between shock process and degradation process with conditional probability. In case (2), we not only consider the dependence between shock process and degradation processes with conditional probability, but also the dependence between multiple degradation processes with Copulas. Finally, the effectiveness of proposed models is demonstrated by reliability analysis of the microengine developed by Sandia National Laboratories and an extended numerical example. Besides, sensitivity analysis is performed to assess the effects of model parameters on the system reliability. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:129 / 138
页数:10
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