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Award ID contains: 1645648

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  1. ; ; (, ASME Letters in Dynamic Systems and Control)
    Abstract This letter presents the design and experimental validation of a real-time image-based feedback control system for metal laser powder bed fusion (LPBF). A coaxial melt pool video stream is used to control laser power in real-time at 2 kHz. Modeling of the melt pool image response to changes in the input laser power is presented. Based on this identified model, a real-time feedback controller is implemented experimentally on a single track and part scales. On a single-track scale, the controller successfully tracks a time-varying melt pool reference. On a part-level scale, the controller successfully regulates the melt pool image signature to the desired reference value, reducing layer-to-layer signal variation and eliminating within-layer signal drift. 
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  2. ; (, IEEE Transactions on Control Systems Technology)
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  3. ; ; ; ; (, IEEE/ASME Transactions on Mechatronics)
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  4. ; (, American Control Conference)
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  5. ; ; (, American Control Conference)
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  6. ; ; ; (, 2019 IEEE 15th International Conference on Automation Science and Engineering (CASE))
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  7. ; ; ; (, IEEE Advanced Intelligent Mechatronics)
    This paper develops a closed-loop approach for ink-jet 3D printing. The control design is based on a distributed model predictive control scheme, which can handle constraints (such as droplet volume) as well as the large-scale nature of the problem. The high resolution of ink-jet 3D printing make centralized methods extremely time-consuming, thus a distributed implementation of the controller is developed. First a graph-based height evolution model that can capture the liquid flow dynamics is proposed. Then, a scalable closed-loop control algorithm is designed based on the model using Distributed MPC, that reduces computation time significantly. The performance and efficiency of the algorithm are shown to outperform open-loop printing and closed-loop printing with existing Centralized MPC methods through simulation results. 
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