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Proceedings Paper

Dynamic characterization of a prototype of the Thirty Meter Telescope primary segment assembly
Author(s): Martin W. Regehr; Peter M. Thompson; M. Mark Colavita; James D. Moore; Mark Sirota; Eric C. Williams
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Paper Abstract

Finite element models (FEMs) are being used extensively in the design of the Thirty Meter Telescope (TMT). One such use is in the design and analysis of the Primary Segment Assembly (PSA). Each PSA supports one primary mirror segment on the mirror cell, as well as three actuators, which are used to control three degrees of freedom - tip, tilt, and piston - of the mirror segment. The dynamic response of the PSA is important for two reasons: it affects the response of the mirror to fluctuating wind forces, and high-Q modes limit the bandwidth of the control loops which drive the actuators, and impact vibration transmissivity, thereby degrading image quality. We have completed a series of tests on a prototype PSA, in which the dynamic response was tested. We report on the test methods used to measure the dynamic response of the PSA alone and with candidate actuators installed, and we present comparisons between the measured response and FEM predictions. There is good agreement between FEM predictions and measured response over the frequency range within which the dynamic response is critical to control system design.

Paper Details

Date Published: 5 August 2010
PDF: 14 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77332G (5 August 2010); doi: 10.1117/12.858155
Show Author Affiliations
Martin W. Regehr, Jet Propulsion Lab. (United States)
Peter M. Thompson, Systems Technology, Inc. (United States)
M. Mark Colavita, Jet Propulsion Lab. (United States)
James D. Moore, Jet Propulsion Lab. (United States)
Mark Sirota, Thirty Meter Telescope Observatory Corp. (United States)
Eric C. Williams, Thirty Meter Telescope Observatory Corp. (United States)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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