Abstract:For the problems of large differences in feature distribution between monitoring signals of different models of rolling bearings and small samples of fault data, which lead to low accuracy of bearing faults, a rolling bearing fault diagnosis algorithm based on improved alternating migration learning is proposed in this paper. In order to give full play to the excellent feature extraction ability of convolutional neural networks (CNN) for two-dimensional data, firstly, the one-dimensional vibration signal is transformed into a two-dimensional image and input to a deep convolutional neural network for learning; secondly, in order to reduce the difference of feature distribution between the source and target domain data, an improved alternately transfer learning (IATL) is proposed to calculate the CORAL loss function and maximum mean discrepancy (MMD) loss function between domains alternately, and back propagate to update the weights and bias parameters of each layer of the network, in order to achieve migration adaptation of bearing characteristics under variable operating conditions, across bearing types and small failure sample conditions; Finally, the Softmax function is used in the fully connected layer for fault diagnosis of the target domain data. In order to verify the effectiveness of the proposed algorithm, a migration experiment is conducted using rolling bearing dataset from Case western reserve university (CWRU). The results show that the algorithm effectively reduces the difference of feature distribution between domain data and has higher fault classification accuracy when compared with algorithms such as calculating only CORAL loss function and MMD loss function.
王鹏,李丹青,王恒. 基于改进交替迁移学习的滚动轴承故障诊断算法[J]. 振动与冲击, 2024, 43(5): 239-249.
WANG Peng,LI Danqing,WANG Heng. Rolling bearing fault diagnosis algorithm based on improved alternating transfer learning. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(5): 239-249.
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