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Journal of Astronomical Telescopes, Instruments, and Systems

Dynamic analysis and control of mirror segment actuators for the European Extremely Large Telescope
Author(s): Gert Witvoet; Remco den Breeje; Jan Nijenhuis; René Hazelebach; Niek Doelman
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Paper Abstract

Segmented primary mirror telescopes require dedicated piston-tip-tilt actuators for optimal optical performance. Netherlands Organisation for Applied Scientific Research (TNO) has developed various prototypes of such actuators, in particular for the E-ELT. This paper presents the dynamics analysis and feedback control results for a specific two-stage prototype. First, the dynamics of the actuator in interconnection with the to-be-positioned mass has been analyzed, both using frequency response measurements and first principles modeling, resulting in a detailed understanding of the dynamic behavior of the system. Next, feedback controllers for both the fine and the coarse stage have been designed and implemented. Finally, the feedback-controlled actuator has been subjected to a realistic tracking experiment; the achieved results have demonstrated that the TNO actuator is able to suppress wind force disturbances and ground vibrations with more than a factor 103, down to 1.4 nm root mean square, which is compliant with the requirements.

Paper Details

Date Published: 28 January 2015
PDF: 13 pages
J. Ast. Inst. Sys. 1(1) 019003 doi: 10.1117/1.JATIS.1.1.019003
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 1, Issue 1
Show Author Affiliations
Gert Witvoet, TNO (The Netherlands)
Remco den Breeje, TNO (The Netherlands)
Jan Nijenhuis, TNO (The Netherlands)
René Hazelebach, TNO (The Netherlands)
Niek Doelman, TNO (The Netherlands)


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