9 July 2008 Dynamic analysis of TMT
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Douglas G. MacMynowski, Carl Blaurock, George Z. Angeli, "Dynamic analysis of TMT", Proc. SPIE 7017, Modeling, Systems Engineering, and Project Management for Astronomy III, 70170W (9 July 2008); doi: 10.1117/12.786935; https://doi.org/10.1117/12.786935
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KEYWORDS
Telescopes

Turbulence

Systems modeling

Image segmentation

Thirty Meter Telescope

Acoustics

Control systems

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