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Proceedings Paper

Dynamic analysis of TMT
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Paper Abstract

Dynamic disturbance sources affecting the optical performance of the Thirty Meter Telescope (TMT) include unsteady wind forces inside the observatory enclosure acting directly on the telescope structure, unsteady wind forces acting on the enclosure itself and transmitted through the soil and pier to the telescope, equipment vibration either on the telescope itself (e.g. cooling of instruments) or transmitted through the soil and pier, and potentially acoustic forces. We estimate the characteristics of these disturbance sources using modeling anchored through data from existing observatories. Propagation of forces on the enclosure or in support buildings through the soil and pier to the telescope base are modeled separately, resulting in force estimates at the telescope pier. We analyze the resulting optical consequences using integrated modeling that includes the telescope structural dynamics, control systems, and a linear optical model. The dynamic performance is given as a probability distribution that includes the variation of the external wind speed and observing orientation with respect to the wind, which can then be combined with dome seeing and other time- or orientation-dependent components of the overall error budget. The modeling predicts acceptable dynamic performance of TMT.

Paper Details

Date Published: 9 July 2008
PDF: 12 pages
Proc. SPIE 7017, Modeling, Systems Engineering, and Project Management for Astronomy III, 70170W (9 July 2008); doi: 10.1117/12.786935
Show Author Affiliations
Douglas G. MacMynowski, California Institute of Technology (United States)
Carl Blaurock, Nightsky Systems, Inc. (United States)
George Z. Angeli, Thirty Meter Telescope Observatory (United States)

Published in SPIE Proceedings Vol. 7017:
Modeling, Systems Engineering, and Project Management for Astronomy III
George Z. Angeli; Martin J. Cullum, Editor(s)

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