Development and sizing of the JWST Integrated Science Instrument Module (ISIM) metering structure

Cengiz O. Kunt; John Johnston; Andrew Bartoszyk; Steve Hendricks

doi:10.1117/12.670112

7 July 2006 Development and sizing of the JWST Integrated Science Instrument Module (ISIM) metering structure

Cengiz O. Kunt, John Johnston, Andrew Bartoszyk, Steve Hendricks

Proceedings Volume 6273, Optomechanical Technologies for Astronomy; 627322 (2006) https://doi.org/10.1117/12.670112
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

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.

Citation Download Citation

Cengiz O. Kunt, John Johnston, Andrew Bartoszyk, and Steve Hendricks "Development and sizing of the JWST Integrated Science Instrument Module (ISIM) metering structure", Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 627322 (7 July 2006); https://doi.org/10.1117/12.670112

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