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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 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...
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