Facing the high cost and complexity of obtaining labeled samples in rolling bearing fault diagnosis, this paper proposes a Dynamic Residual Attention Long Short-Term Memory Network (DRALNet) for cross-condition rolling bearing fault diagnosis. First, the attention mechanism is utilized to dynamically adjust the convolution kernel weights for feature extraction; then, the channel attention mechanism allocates weights to different channels, and residual connections are combined to prevent gradient vanishing or explosion. Next, the long short-term memory network captures long-term dependencies in sequential data; finally, a domain adversarial network is used to reduce distribution differences between the source domain and the target domain, making the model more applicable to the target domain. Validation results on the Case Western Reserve University bearing dataset show that this method achieves an average accuracy of 98.27% in 12 transfer tasks, significantly improving over traditional methods. This ultimately demonstrates that the DRALNet method performs excellently in cross-condition rolling bearing fault diagnosis and has high application value.
Adam(Adaptive moment estimation)是一种在深度学习中广泛使用的自适应参数优化算法。其结合动量和RMSProp的优势,通过动态调整每个参数的学习率,提升模型训练的收敛速度和鲁棒性。Adam利用梯度的一阶矩估计平滑更新,并使用梯度的二阶矩估计调节每个参数的学习率。其参数更新公式如下:
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