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Real-Time Image-Based Feedback Control of Laser Powder Bed Fusion

https://doi.org/10.1115/1.4051588

Shkoruta, Aleksandr; Mishra, Sandipan; Rock, Stephen J. (April 2022, 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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An experimental study on process modeling for selective laser melting ^*

https://doi.org/10.23919/ACC45564.2020.9147644

Shkoruta, Aleksandr; Mishra, Sandipan; Rock, Stephen (July 2020, American Control Conference)

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Iterative learning control for power profile shaping in selective laser melting

https://doi.org/10.1109/COASE.2019.8843070

Shkoruta, Aleksandr; Caynoski, William; Mishra, Sandipan; Rock, Stephen (August 2019, 2019 IEEE 15th International Conference on Automation Science and Engineering (CASE))

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