Estimation of the contouring error vector for the cross-coupled control design

• Published in: IEEE/ASME transactions on mechatronics Vol. 7; no. 1; pp. 44 - 51
• Main Authors: YEH, Syh-Shiuh, HSU, Pau-Lo
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.03.2002; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Computer numerical control; Computer science; control theory; systems; Contour measurement; Contouring; Contours; Control design; Control system synthesis; Control systems; Control theory. Systems; Error analysis; Error correction; Errors; Exact sciences and technology; Feedback loop; Gain; Machining; Mathematical analysis; Mechanical engineering. Machine design; Milling machines; Motion control; Multiaxis; Variable gain; Vectors; Vectors (mathematics); Estimation error; Computer digital control; Machine control; Multivariable control; Error estimation; Machine tool; Vector control; Multiaxis machine; Machining; Control synthesis; Motion control
• ISSN: 1083-4435; 1941-014X
• DOI: 10.1109/3516.990886

In biaxial motion systems, applying the cross-coupled control (CCC) significantly improves contouring accuracy for linear and circular contours. As geometrical and parametric curves become more popular in modern manufacturing, machining processes with multiaxis motion systems are required, however, the available biaxial CCC cannot be directly applied to arbitrary contours with multiaxis machining systems. In this paper, we propose a novel approach for arbitrary contours by estimating the contouring error vector to efficiently determine the variable gains for CCC. Experimental results for a biaxial motion system indicate that the proposed approach efficiently yields variable gains similar to those in traditional CCC. Furthermore, results on a three-axis CNC machining center show that the present approach significantly improves motion accuracy in multiaxis motion systems.