Cross-coupling position command shaping control in a multi-axis motion system

A new structure of a cross-coupling position command shaping controller (CPCSC) for precise tracking in multi-axis motion control is proposed in this paper. This controller feedforwards the cross-coupling terms, based on the geometrical relationship between the tracking and contouring errors, to com...

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Bibliographic Details
Published in:Mechatronics (Oxford) 2011-04, Vol.21 (3), p.625-632
Main Authors: Chen, Chin-Sheng, Chen, Li-Yeh
Format: Article
Language:English
Subjects:
Applied sciences
Commands
Contour error
Contouring
Control systems
Cross-coupling position command shaping controller
Design engineering
Errors
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Mechanical engineering. Machine design
Multi-axis motion control
Physics
Real time
Shape
Solid mechanics
Structural and continuum mechanics
Tracking
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:A new structure of a cross-coupling position command shaping controller (CPCSC) for precise tracking in multi-axis motion control is proposed in this paper. This controller feedforwards the cross-coupling terms, based on the geometrical relationship between the tracking and contouring errors, to compensate for the contouring error in real-time. Compared with the conventional multi-axis cross-coupling control (CCC) system, this new structure has the advantage that its compensators in CCC have a simpler design process than conventional ones, as does its stability analysis. The proposed controller is evaluated and compared experimentally with a traditional uncoupled and a conventional CCC controller on a multi-axis positioning system controlled by microcomputer. The experimental results show that the new structure remarkably reduces contour error. In addition, this new controller can be implemented easily on most current systems by reprogramming the reference position command subroutine.
ISSN:0957-4158
1873-4006
DOI:10.1016/j.mechatronics.2011.01.004