Abstract
In practical peening operation, the values of inlet air pressure and media flow rate are manually preset to acquire desired intensity requirements. The operator often needs to perform intensive experimental trials to determine a set of operational inputs for actual production. Obtaining these operational parameters is often time-consuming and labor-intensive. Thus, in this study, we propose an optimal distributed model predictive control for the multiple input/multiple output system to address the issues. In the newly developed system, control actions of inlet air pressure and voltage are optimally obtained with the anticipation of the predictive future states of the plant models, while reference values of air pressure at the nozzle and media flowrate are determined using a proxy model. The dynamical plant models include an air pressure model and a media flowrate model, which are developed based on measurement data and physics-based knowledge using the sparse identification of nonlinear dynamics algorithm. The proxy model is developed from the measurement data of the intensity, pressure, and media flowrate using a deep machine-learning algorithm. The control performance is demonstrated using on-site controls at the physical machine for different operational scenarios. The obtained measurement results exhibit a favorable control performance in stability, robustness, and accuracy. The measurement intensity is consistent with the target setting value; the difference is smaller than the industrial threshold of ± 0.01mmA for all random tests. In another word, all target setting intensity can be achieved without the need of performing trials to determine the operational parameters. It also suggests that the developed control system can be deployed to the physical machine for actual production.
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Funding
This work is supported by the project entitled “Machine Learning Assisted Control of Shot Peening Process” under grant number A1894a0032 at Institute of High Performance Computing (IHPC) and Advanced Remanufacturing and Technology Centre (ARTC), A*STAR, Singapore.
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Van Bo Nguyen: developed the framework for obtaining process models and proxy model, analyzed data and develop the process models and proxy model, and the control system using distributed MPC, refined both process models and controller, performed all control scenarios for validation and demonstration, developed ideas for this paper, analyzed data, wrote original, and revised paper. Augustine Teo: design experiments, performed experimental trials, analyzed data, and revised paper. Te Ba: discussed, analyzed data, and revised paper. Kunal Ahluwalia: provided some idea on experimental setup and revised paper. Chang Wei Kang: managed and provided direction for research development, provided ideas on control design, and revised paper.
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Nguyen, V.B., Teo, A., Ba, T. et al. A distributed model predictive control with machine learning for automated shot peening machine in remanufacturing processes. Int J Adv Manuf Technol 122, 2419–2431 (2022). https://doi.org/10.1007/s00170-022-10018-4
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DOI: https://doi.org/10.1007/s00170-022-10018-4