Damping Augmentation of Large Deformable Mirrors for Adaptive Optics
Conference: ACTUATOR 2018 - 16th International Conference on New Actuators
06/25/2018 - 06/27/2018 at Bremen, Deutschland
Proceedings: ACTUATOR 2018
Pages: 4Language: englishTyp: PDF
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Authors:
Wang, K.; Preumont, A. (Université libre de Bruxelles, Brussels, Belgium)
Alaluf, D. (European Space Agency - ESA/ESTEC, Noordwijk, The Netherlands)
Mokrani, B. (University of Liverpool, Liverpool, United Kingdom)
Abstract:
The recent progresses in large telescopes call for ever larger deformable mirrors for Adaptive Optics. These mirrors tend have lower natural frequencies, which limits the control bandwidth because of control-structure interaction. This paper proposes a strategy to overcome the control-structure interaction by damping augmentation of the vibration modes responsible for it. The approach is illustrated on a numerical model of a deformable mirror actuated by a thick film of piezoelectric material. Two strategies are analyzed: passive and active.