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US 2004/0111237 A1Published application
Method for estimating residual life of industrial equipment
AssigneeABB AB
InventorPieter-Jan Vlok
Life of this patent
Estimating the term…
Abstract
In a method for estimating the residual life of machinery statistically by calculating conditional expectations, it is disclosed that different statistical approaches are required for defining the behavior of failure processes related to repairable and non-repairable systems and that diagnostic information should be combined with event information to significantly improve the accuracy of predictions.
Claims3
A method for estimating the residual life of rotating machinery within statistical bounds based on event data and corresponding diagnostic measurements, comprising:
- processing of formulation of combined Proportional Intensity Models (PIMs) in the form of Force of Mortality (FOM) for non-repairable systems and Rate of Occurrence of Failure (ROCOF) for repairable systems;
- processing of formulation of said Force of Mortality (FOM) for non-repairable systems or processing of formulation of said Rate of Occurrence of Failure (ROCOF) for repairable systems;
- deriving the probability density from said Force of Mortality (FOM) or said Rate of Occurrence of Failure (ROCOF);
- and
- calculating a conditional expectation of a failure event of said rotating machinery within statistical bounds from the probability density.
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