The Object Reentry Survival Analysis Tool (ORSAT) – Version 6.0
- Paper number
IAC-05-B6.3.06
- Author
Mr. Jose Dobarco-Otero, Jacobs Sverdrup, United States
- Coauthor
Ms. Kristin Bledsoe, Georgia Institute of Technology, United States
- Coauthor
Ms. Rachel De Laune, United States
- Coauthor
Mr. Nicholas L. Johnson, National Aeronautics and Space Administration (NASA), United States
- Coauthor
Mr. William Rochelle, Jacobs Sverdrup, United States
- Coauthor
Mr. Ries Smith, Jacobs Sverdrup, United States
- Year
2005
- Abstract
NASA Safety Standard (NSS) 1740.14 requires that each NASA reentering spacecraft and launch vehicle upper stage be assessed as a human casualty risk to the world’s population upon impact of all surviving debris to the Earth. As a first approach, the risk is usually evaluated with the slightly conservative NASA Debris Assessment Software (DAS). However, if the DAS assessment of the risk does not meet the NSS guideline of 1:10,000, the higher-fidelity Object Reentry Analysis Survival Tool (ORSAT) might be required. Various versions of this code have been used in the past 10 years to perform over 20 different spacecraft reentry analyses. The object of this paper is to discuss the new features of the latest version – ORSAT 6.0. These features include replacement of the trajectory model and improvement of the gravitational model; incorporation of the GRAM atmosphere and a user-defined atmosphere model; 2-D heating rate and temperature variation around spheres, cylinders, cones, and flat plates; drag coefficients for cones; and general program improvements. Additional improvements also include a Graphical User Interface (GUI), gas cap radiation at high entry velocities, recession for non-metallic insulation materials, structural failure of solar array hinges, tank bursting, Unix/Linux plotting scripts, an expanded materials property database, and trajectory mapping on a world map. Sample results are presented for reentry of selected spacecraft using these updated features in ORSAT.
- Abstract document
- Manuscript document
IAC-05-B6.3.06.pdf (🔒 authorized access only).
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