Author(s)

Ziqiang Luo ¹

Affiliation(s)

¹ School of Mechanical and Automation Engineering, Wuhan University of Science and Technology, Wuhan, 430065, China

Corresponding Author

Ziqiang Luo

ABSTRACT

In order to solve the problem of poor noise immunity of neural network in bearing fault detection and to meet the high demand for adaptive extraction ability of network features in the industrial field, this paper proposes a hyper-parameter optimization method to eliminate the error of human-set parameters. Aiming at the non-smoothness and non-linear characteristics of the bearing fault signal, the two-dimensional wavelet transform (2DWT) is used to extract the feature values of the vibration signal of the bearing fault, and it is proposed to use the CNN convolutional neural network (CNN) to train the fault model. Convolutional Neural Network (CNN) is proposed to be used for fault model training. Firstly, the 2D wavelet transform is applied to the bearing vibration signal to extract the time-frequency map of the vibration signal; secondly, the extracted time-frequency map is used as the training object of the convolutional neural network to train the model, and then multiple convolutional neural network frameworks are used for noise immunity test by adding Gaussian white noise to the original signal to construct the test framework, and then the framework with the best noise immunity is used as the base network; and then the CNN is used as the base network. Sparrow Search Algorithm (SSA), Grey Wolf Optimizer (GWO), and Whale Optimization Algorithm (GWO) to find the best parameters. Validated by the public dataset of Western Reserve University, the method can effectively improve the fault identification accuracy of the model and can get rid of the problem of poor network robustness.

KEYWORDS

2D wavelet transform, convolutional neural network, sparrow optimization algorithm, hyperparameter optimization

CITE THIS PAPER

Ziqiang Luo, Identification of time-frequency maps of bearing faults based on hyperparameter optimization SSA-GoogleNet. Journal of Engineering Mechanics and Machinery (2024) Vol. 9: 24-32. DOI: http://dx.doi.org/10.23977/jemm.2024.090105.

REFERENCES

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