Computer Science – Performance
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340407d&link_type=abstract
American Astronomical Society, AAS Meeting #213, #404.07; Bulletin of the American Astronomical Society, Vol. 41, p.196
Computer Science
Performance
Scientific paper
Starshade Shape Tolerances and Mechanical Deployment
Dean Dailey, Tiffany Glassman, NWO Study Team
The primary purpose of the New Worlds Observer (NWO) Starshade is to suppress the light from a star to 10-10 without blocking the light from planets in the habitable zone of that star. In order to successfully deploy a properly functioning Starshade 10s of meters in diameter, we must know precisely how much the shape of the Starshade is allowed to deviate from the theoretical profile without causing its performance to fall below the established threshold. We use a simulation of the optical performance of the Starshade to establish the tolerance of the Starshade to various shape deformations. These Starshade shape tolerance terms are combined into a budget set of the maximum level of tolerable deformations. These budgets become the deployed dimensional stability requirements for structural engineering to use in accessing competing deployment concepts.
The effects that we consider to determine if a deployment scheme will meet the shape tolerance requirements include:
1. Mechanical piece-part manufacturing error
2. Mechanical assembly errors
3. 1 G assembly shape verification error
4. Launch Shift
5. Deployment repeatability errors
6. Thermal distortion errors
7. On-orbit dynamics - jitter
8. CME errors (coefficient of moisture expansion)
9. Contamination errors
Deployed dimensional stability performance margins can then be determined for each deployment concept over each shape distortion effect and a suitable deployment concept can be selected. Each of these effects are described along with the sensitivity analysis to their contribution to the overall performance.
Dailey Dean
Glassman Tiffany
NWO Study Team
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