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Title: Development of a hybrid control system using NURBS interpolator and cross-coupling approach to eliminate contour error : theory and application
Other Titles: Ji yu NURBS cha bu qi yu jiao cha ou he fang fa de lun kuo wu cha hun he kong zhi xi tong : li lun yu ying yong
基於 NURBS 差補器與交叉耦合方法的輪廓誤差混合控制系統 : 理論與應用
Authors: Lam, Chi Ming (林志銘)
Department: Dept. of Manufacturing Engineering and Engineering Management
Degree: Master of Philosophy
Issue Date: 2006
Publisher: City University of Hong Kong
Subjects: Machine-tools -- Numerical control
Notes: CityU Call Number: TJ1189.L35 2006
Includes bibliographical references (leaves 84-90)
Thesis (M.Phil.)--City University of Hong Kong, 2006
ix, 96 leaves : ill. ; 30 cm.
Type: Thesis
Abstract: Over the past decades, advanced motion control systems have received considerable attention in the manufacturing industries. The world of manufacturing has undergone tremendous changes since the introduction of numerical control (NC) for machine tools in the late 1950s. The advent of the computer has created another revolution in manufacturing process and procedure. The quick development of electronic and computer technology has an effect of further pushing NC system to become highly sophisticated. Computer Numerical Control (CNC) technologies have made it possible to manufacture goods faster, improve the product quality, and reduce manufacturing costs. In the past years, advanced motion control systems with multi-axis synchronization together with CNC, have been highly demanded for meeting requirement of high speed and high accuracy. Contour error exists in all multi-axis synchronization systems and CNC machine has no exception. The contour error of a CNC machine is due to four main factors: a) the structure of the machine, b) the way of interpreting the commands generated in CNC systems, c) placement of Acceleration and Deceleration (ACC/DEC) plan, and d) the servo control system. The technology for machine structure attains maturity and the effect of improving the structure of machine is limited. People then focus their attention on the rest of factors. In this study, an improved hybrid control system is proposed. This system composes of NURBS interpolator, ACC/DEC before interpolation plan, and model-free cross-coupling controller. The NURBS interpolator is used to bridge CAD/CAM system and CNC system. The ACC/DEC before interpolation is used to reduce contour error. The cross-coupling controller is used to coordinate axes in the servo control system. Finally, the proposed hybrid control system is verified in an industrial application: CNC engraving machine operation.
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