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Proceedings Paper

A parametric finite-element model for evaluating segmented mirrors with discrete edgewise connectivity
Author(s): Jessica A. Gersh-Range; William R. Arnold; Mason A. Peck; H. Philip Stahl
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Paper Abstract

Since future astrophysics missions require space telescopes with apertures of at least 10 meters, there is a need for on-orbit assembly methods that decouple the size of the primary mirror from the choice of launch vehicle. One option is to connect the segments edgewise using mechanisms analogous to damped springs. To evaluate the feasibility of this approach, a parametric ANSYS model that calculates the mode shapes, natural frequencies, and disturbance response of such a mirror, as well as of the equivalent monolithic mirror, has been developed. This model constructs a mirror using rings of hexagonal segments that are either connected continuously along the edges (to form a monolith) or at discrete locations corresponding to the mechanism locations (to form a segmented mirror). As an example, this paper presents the case of a mirror whose segments are connected edgewise by mechanisms analogous to a set of four collocated single-degree- of-freedom damped springs. The results of a set of parameter studies suggest that such mechanisms can be used to create a 15-m segmented mirror that behaves similarly to a monolith, although fully predicting the segmented mirror performance would require incorporating measured mechanism properties into the model.

Paper Details

Date Published: 24 September 2011
PDF: 9 pages
Proc. SPIE 8125, Optomechanics 2011: Innovations and Solutions, 81250H (24 September 2011); doi: 10.1117/12.893469
Show Author Affiliations
Jessica A. Gersh-Range, Cornell Univ. (United States)
William R. Arnold, Jacobs ESTS Group (United States)
Mason A. Peck, Cornell Univ. (United States)
H. Philip Stahl, NASA Marshall Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 8125:
Optomechanics 2011: Innovations and Solutions
Alson E. Hatheway, Editor(s)

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