Dynamic simulations for the Terrestrial Planet Finder interferometer

Ying-Yong Li; Louise A. Hamlin; Richie Wirz; Douglas Adams; Greg Moore; Robert Coppolino; Chia-Yen Peng; Marie Levine

doi:10.1117/12.620012

31 August 2005 Dynamic simulations for the Terrestrial Planet Finder interferometer

Ying-Yong Li, Louise A. Hamlin, Richie Wirz, Douglas Adams, Greg Moore, Robert Coppolino, Chia-Yen Peng, Marie Levine

Proceedings Volume 5899, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II; 589904 (2005) https://doi.org/10.1117/12.620012
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Ying-Yong Li, Louise A. Hamlin, Richie Wirz, Douglas Adams, Greg Moore, Robert Coppolino, Chia-Yen Peng, and Marie Levine "Dynamic simulations for the Terrestrial Planet Finder interferometer", Proc. SPIE 5899, UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts II, 589904 (31 August 2005); https://doi.org/10.1117/12.620012

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