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Proceedings Paper

Shuttle/Payload Contamination Evaluation (SPACE) Program Improvements
Author(s): Frank J. Jarossy; Joseph C. Pizzicaroli; Nancy L. Owen
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Paper Abstract

The Space Computer program is a systems level analytical model designed to three-dimensionally synthesize the dynamics of the induced on-orbit molecular contaminant environment of the Shuttle Orbiter (SO), Spacelab (SL), and various payloads. The SPACE code is the first systems level code to consider: 1) detailed spacecraft geometry with surface shadowing; 2) a complex mixture of arbitrary contamination sources including both point sources (RCS engines, overboard vents) and extended sources (surfaces), and; 3) a variety of contamination transport mechanisms including direct source-to-surface mass transfer, and impingement flux from scattering due to intermolecular collisions. Significant improvements to the model have resulted from contract activities with MSFC and JSC. These improvements include: 1) an evaluation of the multiple reflection option to determine the significance of this phenomenon for a typical Shuttle Orbiter/Payload configuration; 2) the design and development of new logic to accumulate predicted deposition levels for consecutive orbital time slices and thus provide the capability for automated full mission simulations; and, 3) the development of a simplified version of the SPACE code (Mini-SPACE) to provide a quick-look analysis capability for mission planning purposes circumventing the complex procedures required to model a configuration and prepare the detailed input data files needed for analysis with SPACE; and 4) an interface with the DISSPLA system utility plot package to provide an enhanced presentation of SPACE output data. This paper provides an overview of SPACE program capabilities, a detailed description of recent improvements, and a summary of the anticipated future activities.

Paper Details

Date Published: 19 February 1982
PDF: 8 pages
Proc. SPIE 0287, Shuttle Optical Environment, (19 February 1982); doi: 10.1117/12.932009
Show Author Affiliations
Frank J. Jarossy, Martin Marietta Corporation (United States)
Joseph C. Pizzicaroli, Martin Marietta Corporation (United States)
Nancy L. Owen, Martin Marietta Corporation (United States)

Published in SPIE Proceedings Vol. 0287:
Shuttle Optical Environment
Giovanni G. Fazio; Edgar Miller, Editor(s)

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