Why is the Remaining Useful Life Prediction Uncertain?

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Shankar Sankararaman Kai Goebel

Abstract

This paper discusses the significance and interpretation of uncertainty in the remaining useful life (RUL) prediction of components used in several types of engineering applications, and answers certain fundamental questions such as “Why is the RUL prediction uncertain?”, “How to interpret the uncertainty in the RUL prediction?”, and “How to compute the un- certainty in the RUL prediction?”. Prognostics and RUL pre- diction are affected by various sources of uncertainty. In or- der to make meaningful prognostics-based decision-making, it is important to analyze how these sources of uncertainty affect the remaining useful life prediction, and thereby, compute the overall uncertainty in the remaining useful life pre- diction. The classical (frequentist) and Bayesian (subjective) interpretations of uncertainty and their implications on prognostics are explained, and it is argued that the Bayesian interpretation of uncertainty is more suitable for remaining useful life prediction in the context of condition-based monitoring. Finally, it is demonstrated that the calculation of uncertainty in remaining useful life can be posed as an uncertainty propagation problem, and the practical challenges involved in computing the uncertainty in the remaining useful life prediction are discussed.

How to Cite

Sankararaman, S. ., & Goebel, K. . (2013). Why is the Remaining Useful Life Prediction Uncertain?. Annual Conference of the PHM Society, 5(1). https://doi.org/10.36001/phmconf.2013.v5i1.2263
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Keywords

Uncertainty Quantification, Bayesian, Remaining useful Life, model-based prognosis, uncertainty propagation, interpretation

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Technical Papers

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