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Proceedings Paper

Dynamics and control performance of a very large telescopic structure
Author(s): Harald E. Nicklas; Hans Juergen Kaercher; D. Maurer; B. Arras
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Paper Abstract

Extensive finite-element calculations have been done on a novel type of optical telescope mounting to estimate the dynamic performance as well as the dynamic sensitivity of specific components of the structure. The finite-element analysis led to improved dynamics by welldirected stiffening of the basic structure. At the end of the process a lowest structural eigenfrequency of 8 Hz could be achieved for a 12-m telescope. The finite-element model of this design was also used to estimate the tracking performance of the mount directly. Moreover, it was used to establish and test a control scheme for the telescope that is able to damp the structure within less than a second but residuals in tracking error remain on smaller time scales. Those can not be removed by driving the entire mount but are to be eliminated via fine correction in a second stage.

Paper Details

Date Published: 1 August 1990
PDF: 9 pages
Proc. SPIE 1271, Adaptive Optics and Optical Structures, (1 August 1990); doi: 10.1117/12.20419
Show Author Affiliations
Harald E. Nicklas, Univ. Sternwarte (Germany)
Hans Juergen Kaercher, MAN Gutenhoffnungshuette GmbH (Germany)
D. Maurer, Technische Hochschule Darmstadt (Germany)
B. Arras, Technische Hochschule Darmstadt (Germany)

Published in SPIE Proceedings Vol. 1271:
Adaptive Optics and Optical Structures
Joachim J. Schulte-in-den-Baeumen; Robert K. Tyson, Editor(s)

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