Vibroacoustic analysis and optimization of lightweight silicon carbide mirrors

Lucy E. Cohan; David W. Miller

doi:10.1117/12.824739

26 August 2009 Vibroacoustic analysis and optimization of lightweight silicon carbide mirrors

Lucy E. Cohan, David W. Miller

Proceedings Volume 7436, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts IV; 74360L (2009) https://doi.org/10.1117/12.824739
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

Lightweight, actuated, silicon carbide mirrors are an enabling technology for large aperture, space-based optical systems. These mirrors have the potential to improve optical resolution and sensitivity beyond what is currently possible. However, launch survival is a key concern, especially for very lightweight mirrors. This work uses an integrated modeling approach to determine the vibroacoustic response of mirrors subjected to launch loads through the calculation of peak launch stresses in the silicon carbide substrate and in the actuators. The fully parameterized model used with optimization and trade space exploration allows for the identification of key design parameters for launch survival. The areal density, number or ribs, rib structure, and face sheet thickness are identified as key variables that affect the launch stress and are varied in the optimization. Optimal designs, in terms of lowest peak stress and lowest mass meeting launch stress requirements, are found, and iso-performance is used to identify multiple sets of design parameters that meet launch survival requirements. This modeling effort expands the knowledge of lightweight mirrors through the determination of technology limitations imposed by the launch environment. The modeling method also allows for the addition of uncertainty analysis and launch load alleviation techniques.

Citation Download Citation

Lucy E. Cohan and David W. Miller "Vibroacoustic analysis and optimization of lightweight silicon carbide mirrors", Proc. SPIE 7436, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts IV, 74360L (26 August 2009); https://doi.org/10.1117/12.824739

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