Damping Augmentation of Large Deformable Mirrors for Adaptive Optics

Konferenz: ACTUATOR 2018 - 16th International Conference on New Actuators
25.06.2018 - 27.06.2018 in Bremen, Deutschland

Tagungsband: ACTUATOR 2018

Seiten: 4Sprache: EnglischTyp: PDF

Persönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt

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)

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.