Selective Laser Melting (SLM) is an additive manufacturing technology that builds three dimensional parts by melting layers of metal powder together with a laser that traces out a desired geometry. SLM is popular in industry, however the inherent melting and re-solidification of the metal during the process can, if left uncontrolled, cause excessive residual stress, porosity, and other defects in the final printed parts. This paper presents a control-oriented thermal model of a multi-layer SLM process and proposes a structured model reduction methodology with an associated reduced order model based in-layer controller to track temperature references. Simulation studies demonstrate that the controller is able to prevent layer-to-layer heat buildup and that good closed-loop performance is possible using relatively low-order models.
@article{arxiv.2111.00890,
title = {In-layer Thermal Control of a Multi-layer Selective Laser Melting Process},
author = {Dominic Liao-McPherson and Efe C. Balta and Ryan Wüest and Alisa Rupenyan and John Lygeros},
journal= {arXiv preprint arXiv:2111.00890},
year = {2022}
}