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  • 1
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    The environment power system analysis tool development program (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Environment Power System Analysis Tool (EPSAT) is being developed to provide space power system design engineers with an analysis tool for determining system performance of power systems in both naturally occurring and self-induced environments. The program is producing an easy to use computer aided engineering (CAE) tool general enough to provide a vehicle for technology transfer from space scientists and engineers to power system design engineers. The results of the project after two years of a three year development program are given. The EPSAT approach separates the CAE tool into three distinct functional units: a modern user interface to present information, a data dictionary interpreter to coordinate analysis; and a data base for storing system designs and results of analysis.
    Keywords: PLASMA PHYSICS
    Type: NASA, Marshall Space Flight Center, Current Collection from Space Plasmas; p 352-357
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    High voltage interactions of a sounding rocket with the ambient and system-generated environments (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: EPSAT (environment power system analysis tool) is used to examine the design of SPEAR III, which is scheduled to fly in early 1991. It will test high-voltage designs in both ambient and system-generated environments. Two of the key questions that the experiment hopes to address are whether or not the earth's magnetic field can cause the current that a high-voltage object draws from the plasma to be far less than the current that would be drawn in the absence of the magnetic field and under what neutral environmental conditions a discharge from the high-voltage object to the plasma will occur. The EPSAT program makes it possible to perform a variety of analyses on a preliminary or conceptual-level description of a system in a short period of time. The calculations presented on SPEAR III are all done for a conceptual-level description. The calculations indicate that the experiment will produce the conditions necessary to address these questions.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); 37; 2128-213
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The environment workbench: A design tool for Space Station Freedom (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The environment workbench (EWB) is being developed for NASA by S-CUBED to provide a standard tool that can be used by the Space Station Freedom (SSF) design and user community for requirements verification. The desktop tool will predict and analyze the interactions of SSF with its natural and self-generated environments. A brief review of the EWB design and capabilities is presented. Calculations using a prototype EWB of the on-orbit floating potentials and contaminant environment of SSF are also presented. Both the positive and negative grounding configurations for the solar arrays are examined to demonstrate the capability of the EWB to provide quick estimates of environments, interactions, and system effects.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA, Lyndon B. Johnson Space Center, Fourth Annual Workshop on Space Operations Applications and Research (SOAR 90); p 684-687
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Secondary electron generation, emission and transport: Effects on spacecraft charging and NASCAP models (1987)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Secondary electrons control a spacecraft's response to a plasma environment. To accurately simulate spacecraft charging, the NASA Charging Analyzer Program (NASCAP) has mathematical models of the generation, emission and transport of secondary electrons. The importance of each of the processes and the physical basis for each of the NASCAP models are discussed. Calculations are presented which show that the NASCAP formulations are in good agreement with both laboratory and space experiments.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AGARD, The Aerospace Environment at High Altitudes and its Implications for Spacecraft Charging and Communications; 12 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Using EPSAT to analyze high power systems in the space environment (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The authors review the Environment Power System Analysis Tool (EPSAT) design and demonstrate its capabilities by using it to address some questions that arose in designing the SPEAR III experiment. It is shown that that the rocket body cannot be driven to large positive voltages under the constraints of this experiment. Hence, attempts to measure the effects of a highly positive rocket body in the plasma environment should not be made in this experiment. It is determined that a hollow cathode will need to draw only about 50 mA to ground the rocket body. It is shown that a relatively small amount of gas needs to be released to induce a bulk breakdown near the rocket body, and this gas release should not discharge the sphere. Therefore, the experiment provides an excellent opportunity to study the neutralization of a differential charge.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The Environment-Power System Analysis Tool development program (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Environment Power System Analysis Tool (EPSAT) is being developed to provide engineers with the ability to assess the effects of a broad range of environmental interactions on space power systems. A unique user-interface-data-dictionary code architecture oversees a collection of existing and future environmental modeling codes (e.g., neutral density) and physical interaction models (e.g., sheath ionization). The user-interface presents the engineer with tables, graphs, and plots which, under supervision of the data dictionary, are automatically updated in response to parameter change. EPSAT thus provides the engineer with a comprehensive and responsive environmental assessment tool and the scientist with a framework into which new environmental or physical models can be easily incorporated.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: IECEC-89; Aug 06, 1989 - Aug 11, 1989; Washington, DC; United States
    Format: text
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    NASA TECHNICAL REPORTS
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