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MIMO Model Predictive Control of Bead Geometry in Wire Arc Additive Manufacturing

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Publicado en:The Institute of Electrical and Electronics Engineers, Inc. (IEEE) Conference Proceedings (2021)
Autor principal: Mu, Haochen
Otros Autores: Pan, Zengxi, Li, Yuxing, He, Fengyang, Polden, Joseph, Xia, Chunyang
Publicado:
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Materias:
Predictive control
Wire
Arc deposition
Autoregressive models
Sequences
Welding parameters
Laser beam welding
Manufacturing
Cost function
Geometry
Geometric accuracy
Additive manufacturing
MIMO (control systems)
Welding
Manufacturing industry
Fluctuations
Environmental
Acceso en línea:Citation/Abstract
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Resumen:Conference Title: 2021 IEEE 11th Annual International Conference on CYBER Technology in Automation, Control, and Intelligent Systems (CYBER)Conference Start Date: 2021, July 27 Conference End Date: 2021, July 31 Conference Location: Jiaxing, ChinaGeometric properties of material deposited by the wire arc additive manufacturing (WAAM) process often deviates from desired setpoints. To improve the accuracy and repeatability of the WAAM process, an effective control strategy to maintain desired deposition geometry that operates robustly under various welding conditions is required. In this work, a control strategy utilizing multi-input multi-output (MIMO) model-predictive control (MPC) is presented. This approach, based on linear autoregressive (ARX) modelling, aims to improve the accuracy and flexibility of deposited bead geometry in the WAAM process. The MPC controller updates welding parameters between successive layers by minimizing a cost function based on sequences of input variables. Measurements of deposited bead geometry are made by laser scanner and input to the linear ARX model, which then makes future bead geometry predictions. Weighting coefficients of the ARX model are trained iteratively throughout the manufacturing process. Experimental results show that the derived control strategy can reduce fluctuations in a part's height by 400% and maintain the fluctuation within an acceptable range. In addition, the fluctuations in bead width along a single weld seam was also improved by more than 50%.
DOI:10.1109/CYBER53097.2021.9588331
Fuente:Science Database