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Proceedings Paper

Characterization of the mechanical properties of the SOFIA secondary mirror mechanism in a multi-stage approach
Author(s): Benjamin Greiner; Yannick Lammen; Andreas Reinacher; Alfred Krabbe; Jörg Wagner
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Paper Abstract

The Stratospheric Observatory for Infrared Astronomy (SOFIA) uses its compact and highly integrated Secondary Mirror Mechanism (SMM) to switch between target positions on the sky in a square wave pattern. This chopping motion excites eigenmodes of the mechanism structure, which limit controller and observatory performance. We present the setup and results of experimental modal tests performed on different building stages of a test-bench model as well as on the original flight hardware. Test results were correlated to simulations employing a finite element model in order to identify excited mode shapes and contributing flexible components of the Secondary Mirror Mechanism. It was possible to isolate the motion of the compensation ring and its elastic mounts as the vibration mode inducing the main disturbance at about 300 Hz, which is currently the main mode shape limiting the performance of the chopping controller.

Paper Details

Date Published: 27 July 2016
PDF: 12 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99063R (27 July 2016); doi: 10.1117/12.2231648
Show Author Affiliations
Benjamin Greiner, Univ. Stuttgart (Germany)
Yannick Lammen, Univ. Stuttgart (Germany)
Andreas Reinacher, Univ. Stuttgart (Germany)
Alfred Krabbe, Univ. Stuttgart (Germany)
Jörg Wagner, Univ. Stuttgart (Germany)


Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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