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IEEE TNNLS[HTC+ZGL+CA+BH+DRL](20220131).pdf (744.15 kB)
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Explainable Intelligent Fault Diagnosis for Nonlinear Dynamic Systems: From Unsupervised to Supervised Learning

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posted on 03.02.2022, 05:07 by Hongtian ChenHongtian Chen, Zhigang Liu, Cesare Alippi, Biao Huang, Derong LiuDerong Liu
The increased complexity and intelligence of automation systems require the development of intelligent fault diagnosis (IFD) methodologies. By relying on the concept of a suspected space, this study develops explainable data-driven IFD approaches for nonlinear dynamic systems. More in detail, we parameterize nonlinear systems through a generalized kernel representation used for system modeling and the associated fault diagnosis. An important result obtained is a unified form of kernel representations, applicable to both unsupervised and supervised learning. More importantly, through a rigorous theoretical analysis we discover the existence of \emph{a bridge} (i.e., a bijective mapping) between some supervised and unsupervised learning-based entities. Notably, the designed IFD approaches achieve the same performance by the use of this bridge. In order to have a better understanding of the results obtained, unsupervised and supervised neural networks are chosen as the learning tools to identify generalized kernel representations and design the IFD schemes; an invertible neural network is then employed to build the bridge between them. This study is a perspective article, whose contribution lies in proposing and detailing the fundamental concepts for explainable intelligent learning methods, contributing to system modeling and data-driven IFD designs for nonlinear dynamic systems.

Funding

Natural Sciences and Engineering Research Council of Canada

History

Email Address of Submitting Author

hongtian.chen@ieee.org

Submitting Author's Institution

University of Alberta

Submitting Author's Country

Canada