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  • 1
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    Neutral environment for space station (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The results of studies to determine the contamination compatibility of the cross boom and dual keel Space Station configurations with attached payloads are presented. The approach was to define the 3-D configuration of the Space Station and calculate surface-to-surface view factors and solid angles between surfaces and points in an extensive point matrix around the Space Station via a modified TRASYS model. The molecular number column densities along specific experiment lines-of-sight on the cross boom generally meet JSC 30426 requirements. The deposition of contaminants on payload surfaces exceeds the JSC 30426 requirements. These model predictions require updating because of the impact on background brightness predictions. An increase of a factor of 2 to 10 in column densities would result in an unacceptable optical background.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA, Langley Research Center, A Study of Space Space Station Contamination Effects; p 1-9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Experimental investigation of contamination prevention techniques to cryogenic surfaces on board orbiting spacecraft (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Within the simulation limitations of on-orbit conditions, it was demonstrated that a helium purge system could be an effective method for reducing the incoming flux of contaminant species. Although a generalized purge system was employed in conjunction with basic telescope components, the simulation provided data that could be used for further modeling and design of a specific helium injection system. Experimental telescope pressures required for 90% attenuation appeared to be slightly higher (factor of 2 to 5). Cooling the helium purge gas and telescope components from 300 to 140 K had no measurable effect on stopping efficiency of a given mass flow of helium from the diffuse injector.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-152171 , MCR-78-578
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Payload/orbiter contamination control requirement study (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study was conducted to determine and quantify the expected particulate and molecular on-orbit contaminant environment for selected space shuttle payloads as a result of major shuttle orbiter contamination sources. Individual payload susceptibilities to contamination are reviewed. The risk of payload degradation is identified and preliminary recommendations are provided concerning the limiting factors which may depend on operational activities associated with the payload/orbiter interface or upon independent payload functional activities. A basic computer model of the space shuttle orbiter which includes a representative payload configuration is developed. The major orbiter contamination sources, locations, and flux characteristics based upon available data have been defined and modeled.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-120379 , MCR-74-93
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Preliminary evaluation of the contaminant induced environment for the space shuttle orbiter (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A preliminary evaluation of the on-orbit induced environment from identified major sources of contamination for the STS shuttle orbiter is presented. A contamination computer mathematical model is discussed that was used to develop the description and predictions of the induced environment along with the extent and physical makeup of the molecular induced environment from these sources. The predicted induced molecular environment from each source is evaluated against current Space Shuttle Program on-orbit contamination control criteria. The flash evaporator vents and the VCS 25-lb thrust engines are shown to significantly exceed applicable contamination control criteria and were the subject of extensive evaluation. Preliminary conclusions concerning the contaminant potential of these sources along with recommendations for various measures of contamination control regarding the shuttle orbiter design and operational activities are made.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: PAPER-25 , 8th Conf. on Space Simulation; p 279-304
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Payload/orbiter contamination control assessment support (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The development and use is described of a basic contamination mathematical model of the shuttle orbiter which incorporates specific shuttle orbiter configurations and contamination sources. These configurations and sources were evaluated with respect to known shuttle orbiter operational surface characteristics and specific lines-of-sight which encompass the majority of viewing requirements for shuttle payloads. The results of these evaluations are presented as summary tables for each major source. In addition, contamination minimization studies were conducted and recommendations are made, where applicable, to support the shuttle orbiter design and operational planning for those sources which were identified to present a significant contamination threat.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-141939 , MCR-75-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Orbiter/payload contamination control assessment support (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The development and integration of 16 payload bay liner filters into the existing shuttle/payload contamination evaluation (SPACE) computer program is discussed as well as an initial mission profile model. As part of the mission profile model, a thermal conversion program, a temperature cycling routine, a flexible plot routine and a mission simulation of orbital flight test 3 are presented.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-151654 , MCR-78-517
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Shuttle orbiter - IUS/DSP satellite interface contamination study (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of a contamination analysis on the Defense Support Program (DSP) satellite during launch and deployment by the Space Transportation System (STS) are presented. Predicted contaminant deposition was also included on critical DSP surfaces during the period soon after launch when the DSP is in the shuttle orbiter bay with the doors closed, the bay doors open, and during initial deployment. Additionally, a six sided box was placed at the spacecraft position to obtain directional contaminant flux information for a general payload while in the bay and during deployment. The analysis included contamination sources from the shuttle orbiter, IUS and cradle, the DSP sensor and the DSP support package.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-151682 , MCR-78-512 , AD-A145726
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Payload/orbiter contamination control requirement study, volume 1, exhibit A (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This study is to identify and quantify the expected molecular and particulate on orbit contaminant environment for selected shuttle payloads as a result of major spacelab and shuttle orbiter contaminant sources. This investigation reviews individual payload susceptibilities to contamination, identifies the combined induced environment, identifies the risk of spacelab/payload critical surface(s) degradation, and provides preliminary contamination recommendations. It also establishes limiting factors which may depend upon operational activities associated with the payloads, spacelab, and the shuttle orbiter interface or upon independent payload functional activities.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-120571 , MCR-74-474-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Payload/orbiter contamination control requirement study, volume 2, exhibit A (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The computer printout data generated during the Payload/Orbiter Contamination Control Requirement Study are presented. The computer listings of the input surface data matrices, the viewfactor data matrices, and the geometric relationship data matrices for the three orbiter/spacelab configurations analyzed in this study are given. These configurations have been broken up into the geometrical surfaces and nodes necessary to define the principal critical surfaces whether they are contaminant sources, experimental surfaces, or operational surfaces. A numbering scheme was established based upon nodal numbers that relates the various spacelab surfaces to a specific surface material or function. This numbering system was developed for the spacelab configurations such that future extension to a surface mapping capability could be developed as required.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-120572 , MCR-74-474-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Orbiter/payload contamination control assessment support (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The development and use of a contamination math model of the shuttle orbiter which incorporates specific shuttle orbiter configurations and contamination sources is described. These configurations and sources represent the latest design of the shuttle orbiter and its sources. The results of model predictions for many lines-of-sight and individual and grouped sources are presented. Support trade studies primarily concerned with the supplemental flash evaporator location and operation are presented.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-151365 , MCR-77-107
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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