A weighted DJP-MMD based deep transfer metric learning for the fault diagnosis of bearing under variable working conditions
Zengbing XU , Gaige DING , Yaxin NIE , Xiaoli SUN , Zhigang WANG
Front. Mech. Eng. ›› 2025, Vol. 20 ›› Issue (2) : 16
A weighted DJP-MMD based deep transfer metric learning for the fault diagnosis of bearing under variable working conditions
The change of working conditions not only makes the data distribution inconsistent, but also increases the diagnosis difficulty of fuzzy samples at the fault boundary. The traditional distance-based deep metric learning cannot effectively classify the fuzzy samples at the fault boundary. In the traditional transfer learning models, the maximum mean discrepancy (MMD) and joint maximum mean discrepancy only increase the transferability of same-class samples, and neglect the discriminability of different-class samples across different domains. The discriminative joint probability MMD (DJP-MMD) increases the transferability of same-class samples and the discriminability of different-class samples across different domains, but it only considers the global transferability of all fault classes, ignoring the different transferability of each same fault class. Therefore, a Yu norm-based deep transfer metric learning based on weighted DJP-MMD is proposed to further improve the diagnosis accuracy of bearings under variable working conditions. The deep transfer metric learning model adopts the Yu norm-based similarity instead of the distance-based similarity to effectively classify the data samples, especially those at the fault boundary, and uses the weighted DJP-MMD to measure the data distribution discrepancy between the source and target domains to increase the transferability of each same-class samples and discriminability of different-class samples across different domains. Through the fault diagnosis analysis on bearings under variable working conditions, the diagnosis results demonstrate that the proposed deep transfer metric learning model can diagnose bearing faults with higher accuracy, stronger generalization and anti-noise capabilities compared with other fault diagnosis methods based on transfer learning.
Yu norm / weighted DJP-MMD / deep transfer metric learning / fault diagnosis / variable working conditions
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Higher Education Press
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