Collecting data from mechanical systems in abnormal conditions is expensive and time consuming. Consequently, fault detection approaches based on classical supervised learning working with both normal and abnormal data are not applicable in some condition-based maintenance tasks. To address this problem, this paper proposes Fusing Convolutional Generative Adversarial Encoders (fCGAE) method to create fault detection models from only normal data. Firstly, to obtain an adequate deep feature space, encoder models based on 1D convolutional neural networks are created. Then, these encoders are optimized in an unsupervised way through Bidirectional Generative Adversarial Networks. Finally, the multi-channel features collected from the system are merged with One-Class Support Vector Machine. fCGAE is applied to fault detection in 3D printers, where experimental results in two fault detection cases show excellent generalization capabilities and better performance compared to peer methods.
Bibliographical noteFunding Information:
The work was sponsored in part by GIDTEC Research Group of Universidad Politécnica Salesiana, the National Natural Science Foundation of China (51775112, 71801046), the National Key R&D Program (2016YFE0132200), the MoST Science and Technology Partnership Program (KY201802006), the Chongqing Natural Science Foundation (cstc2019jcyj-zdxmX0013), and the CTBU Project (KFJJ2018107, KFJJ2018075).
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- 3D printers
- Adversarial learning
- Condition-based maintenance
- Convolutional neural networks
- Fault detection