Development of Deep Residual Neural Networks for Gear Pitting Fault Diagnosis Using Bayesian Optimization

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In recent years, the application of deep neural networks containing directed acyclic graph (DAG) architectures in mechanical fault diagnosis has achieved remarkable results. In order to improve the fault diagnosis ability of the networks, researchers have been working on developing new network architectures and optimizing the training process. However, this approach requires sufficient time and empirical knowledge to try potential optimal framework. Furthermore, it is time-consuming and laborious to retune the network architecture and hyperparameter values when faced with different operating conditions or diagnostic tasks. To avoid these drawbacks, this paper proposes an automated network architecture search (NAS) method and perform hyperparameter optimization. The adjacency matrix is used to define the architecture search space, Bayesian optimization is used as the architecture search strategy, and network test error is used for architecture evaluation. Seven types of convolutional layers and pooling layers are used as basic components to build fault diagnosis models. The gear pitting fault experiment including seven gear pitting types was established and used to validate the diagnostic model. The experimental results show that the diagnostic results of the network model automatically constructed by the proposed method are better than the general network model. It can be concluded that the proposed method can indeed replace the manual construction of an effective and practical gear pitting fault diagnosis model.