22 July 2014 High performance 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. TNO has developed various prototypes of such actuators, in particular for the E-ELT. In this paper the control results of a specific two-stage prototype will be presented. 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 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 RMS, which is compliant with the requirements.
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Gert Witvoet, Gert Witvoet, Remco den Breeje, Remco den Breeje, Jan Nijenhuis, Jan Nijenhuis, René Hazelebach, René Hazelebach, Niek Doelman, Niek Doelman, "High performance control of mirror segment actuators for the European Extremely Large Telescope", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91451S (22 July 2014); doi: 10.1117/12.2056901; https://doi.org/10.1117/12.2056901


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