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In this paper, how to estimate residual useful lifetime (RUL) is discussed based on a model-based method when fluctuations exist in the degradation process around its average behavior. The main idea is to model the degradation process as a time-dependent Ornstein-Uhlenbeck (OU) process, where the first passage failure is adopted to consider corresponding RUL estimation. The time-dependent OU process...
In the literature, the effectiveness of a maintenance strategy is usually assessed through a cost criterion which is the long-run expected maintenance cost rate (i.e., performance viewpoint). However, such a criterion does not allow evaluating the variability of maintenance costs from a renewal cycle to another, and classical maintenance strategies seem inappropriate in the sense of risk management...
A major concern for engineers and managers nowadays is to make high quality products and highly reliable systems. In this context, reliability analysis and efficient maintenance decision-making are strongly required. Reliability analysis needs collecting, modeling and analysis different types of measure especially for deteriorating systems. In presence of information data on system deterioration level...
In real cases, the definition of failure sometimes seems ambiguous although boundary-crossing failures are widely accepted in data-analysis work. Usually we don't have really observed “real” failures, but we think a failure occurs once the system degradation index reaches a preset failure level. From this view, the failure level defines the failure when considering boundary-crossing failures. This...
The aim of this study is to propose a predictive grouping maintenance strategy for complex structure systems with gradually deteriorating units. The unit's conditions are inspected at regular time intervals. Preventive maintenance decision rule is mainly based on the group improvement importance measure defined as a ratio of the improvement ability on the system reliability of a group of several units...
This paper deals with a gradually deteriorating system which can be for example a large structure such as a bridge, a dike or a pipeline. A such system should be preventively maintained in order to avoid failures which would have disastrous consequences. A condition-based maintenance policy is then proposed considering a finite horizon. As preventive maintenance actions are assumed to be imperfect...
The aim of this paper is to propose an efficient condition-based maintenance policy for a gradually deteriorating system. In this purpose a stochastic deterioration model is proposed according to the feedback data and once the deterioration is modelled a condition-based maintenance policy is proposed which minimises the long run mean average cost. The performances of the proposed condition-based maintenance...
This paper compares two condition-based maintenance policies based on control limit maintenance decision rule. Each considered maintenance policy is adapted to the information collected through on-line monitoring. The concerned system gradually deteriorates and undergoes a change which leads to a sudden increase of its deterioration rate in a life cycle. In this study, a mathematical model is developed...
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