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Proceedings Paper

Trajectory control of cable suspended FAST telescope focus cabin
Author(s): Bruno Strah; Simon Kern; Francis Fomi; Markus Lazanowski; Hui Li; Jinghai Sun; Rendong Nan; Hans Kärcher; Rainer Nordmann
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Paper Abstract

Operation of the Five-Hundred-Meter Aperture Spherical Telescope (FAST) requires accurate positioning and movement of the receiver platform on a spherical workspace with a radius of 160 m. Supported above the 500 m diameter main reflector it has to be positioned with an accuracy of several millimeters. To achieve this, the receiver is located in the receiver cabin that is suspended on six cables. The cables are attached to six towers located on the circumference of the main reflector and can be actuated via six capstans. In this paper a control concept for the cable-system is presented. Using a detailed mathematical model of the system the performance of the control and the sensitivity to wind and other disturbances is evaluated via simulation. The mechanics are modeled via FEM, the capstan-drives as lumped-mass elements including nonlinear effects like friction and backlash. The control scheme presented consists of position control loops for the capstans and numerically optimized PID-controllers for the positioning of the cabin platform.

Paper Details

Date Published: 23 July 2008
PDF: 12 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70181O (23 July 2008); doi: 10.1117/12.789178
Show Author Affiliations
Bruno Strah, Technische Univ. Darmstadt (Germany)
Simon Kern, Technische Univ. Darmstadt (Germany)
Francis Fomi, Technische Univ. Darmstadt (Germany)
Markus Lazanowski, Technische Univ. Darmstadt (Germany)
Hui Li, National Astronomical Observatories (China)
Jinghai Sun, National Astronomical Observatories (China)
Rendong Nan, National Astronomical Observatories (China)
Hans Kärcher, MT Mechatronics GmbH (Germany)
Rainer Nordmann, Technische Univ. Darmstadt (Germany)

Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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