Maintainability analysis considering time-dependent and time-independent covariates

被引:70
作者
Barabadi, Abbas
Barabady, Javad [1 ]
Markeset, Tore [2 ]
机构
[1] Univ Tromso, Dept Engn & Safety, N-9037 Tromso, Norway
[2] Univ Stavanger, Ctr Ind Asset Management, N-4036 Stavanger, Norway
关键词
Maintainability; Time-dependent covariate; Cox regression model; Operational environment; JAJARM-BAUXITE MINE; REPAIRABLE SYSTEMS; RELIABILITY; REGRESSION; DESIGN; MODELS;
D O I
10.1016/j.ress.2010.08.007
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Traditional parametric methods for assessing maintainability most often only consider time to repair (TTR) as a single explanatory variable. However, to predict availability more precisely for high availability systems, a better model is needed to quantify the effect of operational environment on maintainability. The proportional repair model (PRM), which is developed based on proportional hazard model (PHM), may be used to analyze maintainability in the present of covariates. In the PRM, the effect of covariates is considered to be time independent. However this assumption may not be valid for some situations. The aim of this paper is to develop the Cox regression model and its extension in the presence of time-dependent covariates for determining maintainability. A simple case study is used to demonstrate how the model can be applied in a real case. (C) 2010 Elsevier Ltd. All rights reserved.
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页码:210 / 217
页数:8
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