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Self-supervised learning for efficient remaining useful life prediction
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. RISE Research Institutes of Sweden, Västra Götaland, Mölndal, 431 53, Sweden.ORCID iD: 0000-0002-1262-9143
RISE Research Institutes of Sweden, Västra Götaland, Mölndal, 431 53, Sweden.
2022 (English)In: Proceedings of the Annual Conference of the Prognostics and Health Management Society, PHM, vol 14, nr 1, Prognostics and Health Management Society , 2022, no 1Conference paper, Published paper (Refereed)
Abstract [en]

Canonical deep learning-based remaining useful life prediction relies on supervised learning methods, which in turn requires large data sets of run-to-failure data to ensure model performance. In a considerable class of cases, run-to-failure data is difficult to collect in practice as it may be expensive and unsafe to operate assets until failure. As such, there is a need to leverage data that are not run-to-failure but may still contain some measurable, and thus learnable, degradation signal. In this paper, we propose utilizing self-supervised learning as a pretraining step to learn representations of data which will enable efficient training on the downstream task of remaining useful life prediction. The self-supervised learning task chosen is time series sequence ordering, a task that involves constructing tuples each consisting of n sequences sampled from the time series and reordered with some probability p. Subsequently, a classifier is trained on the resulting binary classification task; distinguishing between correctly ordered and shuffled tuples. The classifier’s weights are then transferred to the remaining useful life prediction model and fine-tuned using run-to-failure data. To conduct our experiments, we use a data set of simulated run-to-failure turbofan jet engines. We show that the proposed self-supervised learning scheme can retain performance when training on a fraction of the full data set. In addition, we show indications that self-supervised learning as a pretraining step can enhance the performance of the model even when training on the full run-to-failure data set. 

Place, publisher, year, edition, pages
Prognostics and Health Management Society , 2022. no 1
National Category
Computer Sciences
Identifiers
URN: urn:nbn:se:mdh:diva-62157DOI: 10.36001/phmconf.2022.v14i1.3222Scopus ID: 2-s2.0-85150477154ISBN: 9781936263059 (print)OAI: oai:DiVA.org:mdh-62157DiVA, id: diva2:1747603
Conference
2022 Annual Conference of the Prognostics and Health Management Society, PHM 2022, Nashville31 October 2022 through 4 November 2022
Available from: 2023-03-30 Created: 2023-03-30 Last updated: 2023-03-30Bibliographically approved

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