Attention-driven transfer learning framework for dynamic model guided time domain chatter detection

Online chatter detection is crucial to ensure the quality and safety of the high-speed milling process. The rapid development of the deep learning community provides a promising tool for chatter detection. However, most previous chatter detection studies rely on complex signal processing techniques, leading to the separation of feature extraction and chatter detection and reducing detection efficiency. Additionally, these studies are developed for a limited range of machining conditions because the development of their model relies on experimental data, while performing experiments with numerous combinations of machining parameters is expensive and time-consuming. To tackle these drawbacks, this paper proposes a transfer learning chatter detection framework that doesn't rely on any experimental data. The proposed framework is composed of the dynamic milling process model, the Double Attention-driven One-Dimension Convolutional Neural Networks (DAOCNN), and the ensemble prediction strategy. Firstly, a dynamic milling process model is established to generate simulated cutting force signals over a wide range of machining parameters, providing abundant training data and saving experimental costs. Then, without any complex signal processing method, the detection results are directly predicted by the proposed DAOCNN from the time-domain signals, eliminating the separation of feature extraction and chatter detection. Finally, a novel ensemble prediction strategy is proposed to ensure an accurate and robust prediction. To validate the effectiveness of the proposed framework, actual milling experiments are carried out under different cutting conditions. Moreover, contrastive studies with other detection approaches and ensemble methods are also performed. The results demonstrate that the milling stability is correctly predicted by the proposed method in an accurate and efficient manner, which indicates the proposed framework can be a promising tool for online chatter detection.