Journal
RELIABILITY ENGINEERING & SYSTEM SAFETY
Volume 221, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ress.2021.108297
Keywords
Prognostics health management; Remaining useful life; Temporal self-attention mechanism; Bidirectional gated recurrent unit; Prediction
Funding
- Ministry of Science and Technology of the People's Republic of China [2019YFB1703902]
- National Natural Science Foundation of China [62073104, U20A20186]
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This paper introduces a novel bidirectional GRU model with temporal self-attention mechanism for predicting remaining useful life (RUL). Experimental results demonstrate its superiority over existing machine learning and deep learning methods.
Prediction of remaining useful life (RUL) is of vital significance in the prognostics health management (PHM) tasks. To deal with the reverse time series and to reflect the difference in RUL prediction results at different time instances, this paper proposes a novel bidirectional gated recurrent unit with temporal self-attention mechanism (BiGRU-TSAM) to predict RUL. Specifically, a novel approach is proposed where each of the considered time instance is assigned a self-learned weight according to the degree of significance. Furthermore, the parameter update process of the TSAM is obtained with solid theoretical foundation, and as a sign of interpretability, it is shown that the assigned weights can remain consistency over several independent training processes. On this basis, the BiGRU-TSAM is applied to predict RUL online. An aircraft turbofan engine dataset and a milling dataset are applied to verify the proposed RUL prediction approach. The experimental results show the superiority of the proposed approach over the existing ones based on machine learning and deep learning.
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