Structural-thermal-optical performance (STOP) sensitivity analysis for the James Webb Space Telescope

Carl Blaurock; Mark McGinnis; Kevin Kim; Gary E. Mosier

doi:10.1117/12.618697

18 August 2005 Structural-thermal-optical performance (STOP) sensitivity analysis for the James Webb Space Telescope

Carl Blaurock, Mark McGinnis, Kevin Kim, Gary E. Mosier

Proceedings Volume 5867, Optical Modeling and Performance Predictions II; 58670V (2005) https://doi.org/10.1117/12.618697
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The James Webb Space Telescope (JWST) is a key component of NASA's Origins Program to understand the origins and future of the universe. JWST will be used to study the birth and formation of galaxies and planets. The mission requires a large (25m² aperture) but extremely stable (150 nm RMS wave front error) optical platform, where performance is a tightly coupled function of numerous physical processes. Distortion due to thermal loading is a significant error source. The process by which predicted heat loads are mapped to optical error is termed Structural-Thermal-Optical Performance (STOP) modeling. Thermal-optical performance is a function of heat loads, thermal properties (conductivities, radiative coupling coefficients), structural properties (moduli, geometry, thermal expansion coefficients, ply layup angles), and optical sensitivities. Sensitivities, the gradients of performance with respect to design parameters, give a direct way to identify the parameters that have the largest influence on performance. Additionally, gradients can identify the largest sources of uncertainty, and thus contribute to improving the robustness of the design, either via redesign or by placing requirements on parameter variability. The paper presents a general framework for developing the analytical sensitivities of the STOP prediction using the Chain Rule. The paper focuses on solving for the sensitivities of the steady-state, conduction-only, problem, using discipline modeling tools (thermal, structural, and optical) to compute the terms in the STOP gradients. The process is demonstrated on the SDR2 Rev. 1 cycle of the JWST modeling effort.

Citation Download Citation

Carl Blaurock, Mark McGinnis, Kevin Kim, and Gary E. Mosier "Structural-thermal-optical performance (STOP) sensitivity analysis for the James Webb Space Telescope", Proc. SPIE 5867, Optical Modeling and Performance Predictions II, 58670V (18 August 2005); https://doi.org/10.1117/12.618697

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