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Proceedings Paper

Development and sizing of the JWST Integrated Science Instrument Module (ISIM) metering structure
Author(s): Cengiz O. Kunt; John Johnston; Andrew Bartoszyk; Steve Hendricks
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Paper Abstract

The JWST Integrated Science Instrument Module (ISIM) includes a large metering structure (approx. 2m × 2m × 1.5m) that houses the science instruments and guider. Stringent dimensional stability and repeatability requirements combined with mass limitations led to the selection of a composite bonded frame design comprised of biased laminate tubes. Even with the superb material specific stiffness, achieving the required frequency for the given mass allocations in conjunction with severe spatial limitations imposed by the instrument complement has proven challenging. In response to the challenge, the ISIM structure team considered literally over 100 primary structure topology and kinematic mount configurations, and settled on a concept comprised of over 70 m of tubes, over 50 bonded joint assemblies, and a "split bi-pod" kinematic mount configuration. In this paper, we review the evolution of the ISIM primary structure topology and kinematic mount configuration to the current baseline concept.

Paper Details

Date Published: 7 July 2006
PDF: 10 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 627322 (7 July 2006); doi: 10.1117/12.670112
Show Author Affiliations
Cengiz O. Kunt, Swales Aeropace (United States)
John Johnston, NASA Goddard Space Flight Ctr. (United States)
Andrew Bartoszyk, Swales Aeropace (United States)
Steve Hendricks, Swales Aeropace (United States)

Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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