Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Smart Structures and Systems Volume 21, Number 6, June 2018 , pages 777-791 DOI: https://doi.org/10.12989/sss.2018.21.6.777 |
|
|
|
Control-structure interaction in piezoelectric deformable mirrors for adaptive optics |
||
Kainan Wang, David Alaluf, Bilal Mokrani and André Preumont
|
||
| Abstract | ||
| This paper discusses the shape control of deformable mirrors for Adaptive Optics in the dynamic range. The phenomenon of control-structure interaction appears when the mirror becomes large, lowering the natural frequencies fi, and the control bandwidth fc increases to improve the performance, so that the condition fc < fi is no longer satisfied. In this case, the control system tends to amplify the response of the flexible modes and the system may become unstable. The main parameters controlling the phenomenon are the frequency ratio fc / fi and the structural damping s. Robustness tests are developed which allow to evaluate a lower bound of the stability margin. Various passive and active strategies for damping augmentation are proposed and tested in simulation. | ||
| Key Words | ||
| adaptive optics; deformable mirror; control-structure interaction; active/passive damping | ||
| Address | ||
| Kainan Wang and André Preumont: Department of Control Engineering and System Analysis, Université Libre de Bruxelles (ULB), CP. 165-55, 50 Av. F.D. Roosevelt, B-1050, Brussels, Belgium David Alaluf: European Space Agency - ESA/ESTEC, Opto-Electronics Section, Keplerlaan 1, 2201 AZ Noordwijk ZH, The Netherlands Bilal Mokrani: Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, The Quadrangle, Brownlow Hill L69 3GH, United Kingdom | ||