Journal
NEUROCOMPUTING
Volume 185, Issue -, Pages 64-72Publisher
ELSEVIER
DOI: 10.1016/j.neucom.2015.12.041
Keywords
Degradation modeling; Inverse Gaussian process; Random effect; Remaining useful life
Categories
Funding
- National Natural Science Foundation of China [11501005, 11301002]
- Academic and Technology Leaders to Introduction Projects of Anhui University
- Natural Science Foundation for the Higher Education Institutions of Anhui Province of China [KJ2015A331]
- National Science Foundation of China [11471016, 11401004]
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The use of degradation data to estimate the remaining useful life (RUL) has gained great attention with the widespread use of prognostics and health management on safety critical systems. Accurate RUL estimation can prevent system failure and reduce the running risks since the efficient maintenance service could be scheduled in advance. In this paper, we present a degradation modeling and RUL estimation approach by using available degradation data for a deteriorating system. An inverse Gaussian process with the random effect is firstly used to characterize the degradation process of the system. Expectation maximization algorithm is then adopted to estimate the model parameters, and the random parameters in the degradation model are updated by Bayesian method, which makes the estimated RUL able to be real-time updated in terms of the fresh degradation data. Our proposed method can capture the latest condition of the system by means of updating degradation data continuously, and obtain the explicit expression of RUL distribution. Finally, a numerical example and a practical case study are provided to show that the presented approach can effectively model degradation process for the individual system and obtain better results for RUL estimation. (C) 2015 Elsevier B.V. All rights reserved.
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