An update on the role of systems modeling in the design and verification of the James Webb Space Telescope

Muheim, Danniella M.; Menzel, Michael T.; Mosier, Gary E.; Howard, Joseph M.; Irish, Sandra; Maghami, Peiman G.; Mehalick, Kimberly I.; Parrish, Keith; Pitman, Joseph; Thomson, Shaun; Asuquo, Charity; Blaurock, Carl; Congedo, Cherie; Ha, Kong Q.; Holmes, Norman C.; Liu, Frank X.; McGinnis, Mark A.; Mariconti, Stephen; May, Christopher P.; Russell, Blair; Sanders, James A.; Shiri, Shahram; Smith, Jeffrey S.; Skelton, Dennis L.

doi:10.1117/12.856897

Cited by 2 publications

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“…In many respects, JWST flight model development, implementation and verification followed the rigorous principles applied to flight hardware to insure the best IM outcome. More details regarding the overall JWST IM approach can be found in the literature 11,12,13 .…”

Section: The Role Of Integrated Modelingmentioning

confidence: 99%

Integrated modeling of the James Webb Space Telescope: pre-launch predictions, flight performance, and lessons learned

Levine-West,

Mosier,

Walsh

et al. 2023

Optical Modeling and Performance Predictions XIII

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Because of its size and complexity, the Observatory performance of the James Webb Space Telescope (JWST) in its operating condition was primarily verified by analysis prior to launch, breaking the standard NASA paradigm of test-asyou-fly. Most of the requisite analytical predictions were achieved through Integrated Modeling which combines models of the various physics and subsystem behaviors affecting system-level performance: thermal, jitter, structures thermal distortion, gravity release and alignments, optics, wavefront sensing and control, attitude control, straylight and launch loads analysis. We will briefly describe the process by which models were managed, constructed, verified, validated, and used to support the analyses. We will address how uncertainties were accounted for given the many unknowns of the nanometric performance of the first-of-its-kind large deployable cryogenic precision optics in space. Finally, we will compare the pre-flight predictions to actual performance on-orbit for several key analysis use cases and conclude with lessons learned for future missions.The term "jitter" is often synonymous with high-frequency, uncompensated contributions to line-of-sight (LOS) stability or image motion. For the James Webb Space Telescope (JWST) mission, this working definition was extended to include dynamic contributions to wavefront error (WFE). Pre-launch verification of on-orbit jitter performance was not possible via testing, therefore high-fidelity end-to-end modeling was needed for credible verification-by-analysis. The jitter analysis was a main thrust of the overall JWST Integrated Modeling effort and was supported by a robust model verification and validation activities. Following launch, during the latter stages of the 6-month commissioning phase, LOS measurements were obtained and compared to the pre-launch predictions, then to a set of revised predictions. Here we present the modeling methodology supporting the jitter analysis, the pre-and post-launch analysis results, the comparison with the flight data, and conclusions drawn from this comparison.

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Section: The Role Of Integrated Modelingmentioning

confidence: 99%

Integrated modeling of the James Webb Space Telescope: pre-launch predictions, flight performance, and lessons learned

Levine-West,

Mosier,

Walsh

et al. 2023

Optical Modeling and Performance Predictions XIII

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The Design, Verification, and Performance of the James Webb Space Telescope

Menzel

Davis

Parrish

et al. 2023

PASP

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The James Webb Space Telescope (JWST) is NASA’s flagship mission successor to the highly successful Hubble Space Telescope. It is an infrared observatory featuring a cryogenic 6.6 m aperture, deployable Optical Telescope Element (OTE) with a payload of four science instruments (SIs) assembled into an Integrated Science Instrument Module (ISIM) that provide imagery and spectroscopy in the near-infrared band between 0.6 and 5 μm and in the mid-infrared band between 5 and 28.1 μm. JWST was successfully launched on 2021 December 25 aboard an Ariane 5 launch vehicle. All 50 major deployments were successfully completed on 2022 January 8. The observatory performed all midcourse correction maneuvers and achieved its operational mission orbit around the Sun–Earth second Lagrange point (L2). All commissioning and calibration activities have been completed, and JWST has begun its science mission. This paper will provide a description of the driving requirements and their technical challenges, the engineering processes involved in the design formulation, the resulting observatory design, the verification programs that proved it to be flightworthy, and the measured on-orbit performance of the observatory. Since companion papers will describe the details of the OTE and SIs, this paper will concentrate on describing the key features of the observatory architecture that accommodates these elements, particularly those features and capabilities associated with accommodating the radiometric and image-quality performance.

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An update on the role of systems modeling in the design and verification of the James Webb Space Telescope

Cited by 2 publications

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Integrated modeling of the James Webb Space Telescope: pre-launch predictions, flight performance, and lessons learned

Integrated modeling of the James Webb Space Telescope: pre-launch predictions, flight performance, and lessons learned

The Design, Verification, and Performance of the James Webb Space Telescope

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