A fault diagnosis method for wind turbine rolling bearings is proposed
which combines the gradient dynamic selective alignment (DSA) method
dual-channel feature fusion technique (DCFF)
and deep learning. Firstly
the acquired one-dimensional time series data are transformed into two different two-dimensional image representations using recursive mapping (RP) and Markov transfer field (MTF). These transformed images are then input into an encoder for reconstruction into a low-dimensional representation. Next
a dual-channel feature fusion convolutional neural network (DCFFC) is constructed
embedding an improved attention mechanism within FRNet to extract in-depth feature information. A second-level feature fusion is performed to complete the feature classification. Finally
a gradient masking matrix is constructed using the data reconstruction loss of the decoder and the feature extraction network classification loss to achieve gradient dynamic self-adaptation throughout the fault diagnosis process. Experimental validation using the Paderborn dataset demonstrates that the proposed method achieves a diagnostic accuracy of 99%
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