At present, fault diagnosis methods based on deep learning generally have the problems of large model parameters and long diagnosis times, and the diagnostic performance will be greatly reduced in noisy environments. This paper proposes a fast and lightweight intelligent diagnosis model for rolling bearing fault diagnosis. Firstly, the parameters of the variational mode decomposition (VMD) are optimized using the osprey optimization algorithm (OOA) to design a unique multi-frequency band grayscale feature map based on the intrinsic mode function (IMF) component. Then a residual attention mechanism module (RAM) is designed based on the efficient channel attention (ECA) module, which is integrated into the SqueezeNet model, and the K-nearest neighbor (KNN) method is used instead of the Softmax function to identify and classify the faults, and the RSqueezeNet-KNN model is established. Experimental results on two bearing datasets show that the model is able to achieve lightweight applications with excellent diagnostic performance compared to other methods in noisy environments.
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