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Author Skordeli-Eleni; Doumanidis-Charalabos
Source Proceedings-of-the-American-Control-Conference. v 3 1999, IEEE, Piscataway, NJ, USA,99CB36251. p 1734-1738; Proceedings of the 1999 American Control Conference (99ACC). San Diego, CA, USA
Abstract In this article, a distributed-parameter geometry control scheme is established to obtain a desired surface topology in material deposition processes, by modulating the feed and motion of a moving mass source. This is based on dynamic geometry shaping by a real-time optimization technique. The control strategy is founded on an analytical model of such material addition, using superposition of unit deposition distributions, composed of elementary spherical primitives. This real-time surface geometry model, with its parameters identified by in-process profile measurements, is used for Smith-prediction of the material shape in the unobservable deposition region. The methodology is tested in geometric command following on a fused wire deposition welding station, using optical sensing by a scanning laser stripe. The infinite-dimensional modeling and control methodology is applicable to solid freeform fabrication methods, generating 3-D solid objects by material deposition in successive layers made of a djacent beads. 12 Refs. (Auth abstract) XX