Active-passive correction of wind buffeting deformation on large thin meniscus mirrors

Details Active-passive correction of wind buffeting deformation on large thin meniscus mirrors Active-passive correction of wind buffeting deformation on large thin meniscus mirrors

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2199.1141c&link_type=abstract

Proc. SPIE Vol. 2199, p. 1141-1153, Advanced Technology Optical Telescopes V, Larry M. Stepp; Ed.

Computer Science

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Scientific paper

This paper presents a solution to correct wind induced deformation on a 8.0 m thin meniscus mirror supported by a system of astatic active supports. The correction scheme is based on an active correction using the force actuators which support the mirror, and a passive rate dependent coupling of the mirror to the cell. The paper identifies the fundamental design parameters of the passive correction system and the active controller, and shows its wind attenuation capabilities. A 3D simulation verifies the good performance of the system for wind velocities of about 45 km/h. Furthermore, the influence of cell deflection on the mirror due to the passive coupling system is shown.

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