Model-Based Feedforward Control of Part Height in Directed Energy Deposition
In: Materials, Jg. 14 (2021), Heft 2, S. 337-337
Online
academicJournal
Zugriff:
Control of the geometric accuracy of a metal deposit is critical in the repair and fabrication of complex components through Directed Energy Deposition (DED). This paper developed and experimentally evaluated a model-based feedforward control of laser power with the objective of achieving the targeted part height in DED. Specifically, based on the dynamic model of melt-pool geometry derived from our prior work, a nonlinear inverse-dynamics controller was derived in a hatch-by-hatch, layer-by-layer manner to modulate the laser power such that the melt-pool height was regulated during the simulated build process. Then, the laser power trajectory from the simulated closed-loop control under the nonlinear inverse-dynamics controller was implemented as a feedforward control in an Optomec Laser-Engineered Net Shape (LENS) MR-7 system. This paper considered the deposition of L-shaped structures of Ti-6AL-4V as a case study to illustrate the proposed model-based controller. Experimental validation showed that by applying the proposed model-based feed-forward control for laser power, the resulting build had 24–42% reduction in the average build height error with respect to the target build height compared to applying a constant laser power through the entire build or applying a hatch-dependent laser power strategy, for which the laser power values were obtained from experimental trial and error.
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Model-Based Feedforward Control of Part Height in Directed Energy Deposition
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Autor/in / Beteiligte Person: | Wang, Qian ; Li, Jianyi ; Nassar, Abdalla R. ; Reutzel, Edward W. ; Mitchell, Wesley F. |
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Zeitschrift: | Materials, Jg. 14 (2021), Heft 2, S. 337-337 |
Veröffentlichung: | MDPI AG, 2021 |
Medientyp: | academicJournal |
ISSN: | 1996-1944 (print) |
DOI: | 10.3390/ma14020337 |
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