Real-Time Image-Based Feedback Control of Laser Powder Bed Fusion
- 19 July 2021
- journal article
- research article
- Published by ASME International in ASME Letters in Dynamic Systems and Control
- Vol. 2 (2), 1-12
- https://doi.org/10.1115/1.4051588
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.Keywords
Funding Information
- Division of Computer and Network Systems (1645648)
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