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Proceedings Paper

Study on H-Infinity control for LAMOST main axes
Author(s): Wangping Zhou; Xinqi Xu; Zhiming Dong
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Paper Abstract

The workshop test of mount drive for Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) was completed in June of 2005. Now the giant mount has just been erected on Xinglong station, and is due to test in the summer of 2006. LAMOST mount mechanism features friction drive on both axes, and oil pad is employed specifically for the azimuth. For further improving the tracking accuracy in worse surroundings some nonlinear phenomena in the drive chain have to be addressed. Moreover, external uncertainties on Xinglong site, wind buffeting in particular, could affect load variation on the drive. The control system parameters would change with time, thus eventually degrade the tracking performance. All these reasonable assumptions call for a more robust controller than conventional PID approach to cope with. This is where H-Infinity controller comes in. This paper focuses on the mount drive of LAMOST by using H-Infinity technique and comparison with the PID servo. The load disturbance rejection is discussed, as well as transmission rigidity improvement is analyzed. Study and simulation are done in Matlab. The model test in our friction drive lab is presented.

Paper Details

Date Published: 6 July 2006
PDF: 10 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 627333 (6 July 2006); doi: 10.1117/12.671107
Show Author Affiliations
Wangping Zhou, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Chinese Academy of Sciences (China)
Xinqi Xu, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Zhiming Dong, National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology (China)
Chinese Academy of Sciences (China)


Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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