Abstract
The geometric precision of machined parts is greatly reduced due to thermal errors, thereby the thermal errors should be controlled and compensated timely to improve the machining accuracy. But the previously established thermal error models in related studies are not robust, and the predictive accuracy is not high, and the convergence is weak. Moreover, the error control delay is serious due to the network bandwidth limitation. To overcome the above challenges, the theoretical and data-driven methods are combined. The intrinsic long-term memory characteristic of thermal errors is revealed by the theoretical method and the finite element analysis, providing a theoretical guidance for the data-driven method. Then a residual-based one-dimensional convolution-minimum gate unit model is designed based on the residual connection. The designed one-dimensional convolution layer extracts the data features, and the residual connection with multiple pooling layers is used to compress the dimension of the error data. The minimal gate unit is used to improve the convergence rate. Then a new physical-data-edge-cloud terminal architecture is proposed by combining the advantages of the cloud computing and edge computing. Finally, the experiment was conducted to verify the designed physical-data-edge-cloud terminal architecture. The results indicate that the predictive accuracy is 98.18% and that the convergence time is shortened to 13.719 s compared with traditional thermal error models. Furthermore, the geometric error is reduced by more than 80%, and the total time consumption is 166 s, and the data transmission time is 25 s. The system efficiency of the designed physical-data-edge-cloud terminal system is far higher than that of physical-edge-cloud, physical-data-cloud, and physical-cloud systems.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (52275474, 51905057), the Natural Science Foundation Project of Chongqing, Chongqing Science and Technology Commission (cstc2019jcyj-msxmX0050), the Fundamental Research Funds for the Central Universities (2020CDJQY-A036), the Venture & Innovation Support Program for Chongqing Overseas Returnees (cx2019054), State Key Laboratory for Manufacturing Systems Engineering (sklms2020016), the Postgraduate Research and Innovation Project of Chongqing (CYS22012), and the Postgraduate Research and Innovation Project of Chongqing (CYS22013).
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Luo, F., Ma, C., Liu, J. et al. Thermal error prediction and control method combining residual-based one-dimensional convolution-minimum gate unit model with physical-data-edge-cloud terminal architecture. Neural Comput & Applic 35, 15477–15502 (2023). https://doi.org/10.1007/s00521-023-08553-6
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DOI: https://doi.org/10.1007/s00521-023-08553-6