28 January 2015 Dynamic analysis and control of mirror segment actuators for the European Extremely Large Telescope
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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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Gert Witvoet, Gert Witvoet, Remco den Breeje, Remco den Breeje, Jan Nijenhuis, Jan Nijenhuis, René Hazelebach, René Hazelebach, Niek Doelman, Niek Doelman, } "Dynamic analysis and control of mirror segment actuators for the European Extremely Large Telescope," Journal of Astronomical Telescopes, Instruments, and Systems 1(1), 019003 (28 January 2015). https://doi.org/10.1117/1.JATIS.1.1.019003 . Submission:

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