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Proceedings Paper

Dynamic simulations for the Terrestrial Planet Finder interferometer
Author(s): Ying-Yong Li; Louise A. Hamlin; Richie Wirz; Douglas Adams; Greg Moore; Robert Coppolino; Chia-Yen Peng; Marie Levine
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Paper Abstract

The Terrestrial Planet Finder Interferometer (TPF-I) mission requires a set of formation-flying collector telescopes that direct the incoming light to a beam combiner where the beams are combined and detected to identify habitable planets. A baseline TPF collector design, using a primary mirror of 4.2 meters in diameter, is used here to conduct a dynamic study. The objective is to investigate the effects of dynamic response of the spacecraft on the system optical performance at the presence of disturbances that arise from the reaction wheel assembly and thruster loading, respectively. Frequency responses where the frequency is associated with the flywheel speed are presented in the paper. The results focus on the surface oscillation of the primary mirror and the point at which the secondary mirror is located. Transient response simulations under the baseline four thruster-assembly configuration were conducted using various duty cycles and thrust levels determined by the TPF formation rotation requirements. This paper will also describe an investigation conducted using new IMOS (Integrated Modeling of Optical Systems), which is an open, multi-disciplinary, and Matlab-based dynamic/optical system simulation code. A pre-processor that is able to generate the sub-structure modal models required by ISYSD (Integrated System Dynamics) was developed in new IMOS. ISYSD is used to develop a high-fidelity system dynamic model by integrating the sub-structure modal models. Finally, the paper will summarize current and future work in order to meet the TPF dynamic requirements.

Paper Details

Date Published: 31 August 2005
PDF: 11 pages
Proc. SPIE 5899, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II, 589904 (31 August 2005); doi: 10.1117/12.620012
Show Author Affiliations
Ying-Yong Li, Jet Propulsion Lab. (United States)
Louise A. Hamlin, Jet Propulsion Lab. (United States)
Richie Wirz, Jet Propulsion Lab. (United States)
Douglas Adams, Jet Propulsion Lab. (United States)
Greg Moore, Jet Propulsion Lab. (United States)
Robert Coppolino, Measurement Analysis Corp. (United States)
Chia-Yen Peng, Jet Propulsion Lab. (United States)
Marie Levine, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 5899:
UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II
Howard A. MacEwen, Editor(s)

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