Design/analysis of the JWST ISIM bonded joints for survivability at cryogenic temperatures

Bartoszyk, Andrew; Johnston, John D.; Kaprielian, Charles; Kuhn, Jonathan L.; Kunt, Cengiz; Rodini, Benjamin; Young, Daniel

doi:10.1117/12.619011

Cited by 9 publications

(4 citation statements)

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“…A key consideration of ISA for telescopes is the stability of the joined segments. Bartoszyk's [19] work on non-ISA joints for the James Webb Space Telescope showed that bonded joint stability can be achieved even at cryogenic temperatures. ISA joining technology (mechanical latching, bonding, and welding) and the relative stability of the joined system for each method are primary design drivers for space telescope assembly.…”

Section: High Definition Space Telescopementioning

confidence: 99%

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In-Space Structural Assembly: Applications and Technology

Belvin

Doggett

Watson

et al. 2016

3rd AIAA Spacecraft Structures Conference

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Section: High Definition Space Telescopementioning

confidence: 99%

“…Ref. 19 shows that bonded joints can achieve the stability requirements for telescope applications. The opportunity exists for new joining approaches to be developed such as magnetic latching in future ISA operations.…”

Section: A Structural Assemblymentioning

confidence: 99%

In-Space Structural Assembly: Applications and Technology

Belvin

Doggett

Watson

et al. 2016

3rd AIAA Spacecraft Structures Conference

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“…2 The ISIM Structure is an approximately 2m x 2m x 1.5m bonded composite frame that acts as a metering structure between the instruments/guider and the telescope. 3,4 The ISIM Structure interfaces to the OTE via a kinematic mount (KM) system consisting of two bipods and two monopods. The ISIM Structure and the supported instruments are designed to operate at cryogenic temperatures (~35 K), and thermal distortion performance is critical to maintaining the alignment of the instruments to the ISIM Structure.…”

Section: Overview Of Jwst Isim and The Isim Structurementioning

confidence: 99%

Cryogenic thermal distortion model validation for the JWST ISIM structure

Johnston

Cofie

2011

SPIE Proceedings

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The James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) Structure is a precision optical metering structure for the JWST science instruments. Optomechanical performance requirements place stringent limits on the allowable thermal distortion of the metering structure. A significant effort was completed to develop capabilities to predict and metrologize cryogenic thermal distortion of the ISIM Structure. This paper focuses on thermal distortion finite element modeling, analysis, and model validation. Extensive thermal distortion analysis was completed during the design phase for the ISIM Structure to demonstrate that thermal distortion requirements were achieved. Comparison of measurements from recently completed cryogenic testing and model predictions demonstrate the adequacy of thermal distortion modeling uncertainty factors adopted during the design phase, and provide bounds on the accuracy of the model predictions. This paper will provide an overview of the test configurations, describe the thermal distortion models of the tests, and provide a comparison of test results and analytical predictions from the models.

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Section: Introduction 11 Overview Of Jwst Isim and The Isim Structurementioning

confidence: 99%

Cryogenic thermal distortion performance characterization for the JWST ISIM structure

et al. 2011

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The James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) Structure is a precision optical metering structure for the JWST science instruments. Optomechanical performance requirements place stringent limits on the allowable thermal distortion of the metering structure between ambient and cryogenic operating temperature (~35 K). This paper focuses on thermal distortion testing and successful verification of performance requirements for the flight ISIM Structure. The ISIM Structure Cryoset Test was completed in Spring 2010 at NASA Goddard Space Flight Center in the Space Environment Simulator Chamber. During the test, the ISIM Structure was thermal cycled twice between ambient and cryogenic (~35 K) temperatures. Photogrammetry was used to measure the Structure in the ambient and cryogenic states for each cycle to assess both cooldown thermal distortion and repeatability. This paper will provide details on the post-processing of the metrology datasets completed to compare measurements with performance requirements.

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Design/analysis of the JWST ISIM bonded joints for survivability at cryogenic temperatures

Cited by 9 publications

References 0 publications

In-Space Structural Assembly: Applications and Technology

In-Space Structural Assembly: Applications and Technology

Cryogenic thermal distortion model validation for the JWST ISIM structure

Cryogenic thermal distortion performance characterization for the JWST ISIM structure

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