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  • Other Sources  (4)
  • Space Communications, Spacecraft Communications, Command and Tracking  (2)
  • Composite Materials  (1)
  • Fluid Mechanics and Thermodynamics  (1)
  • 2005-2009  (4)
  • 2008  (4)
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  • Other Sources  (4)
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  • 2005-2009  (4)
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  • 1
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    Building a GPS Receiver for Space Lessons Learned (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Over the past 4 years the Component Systems and Hardware branch at NASA GSFC has pursued an inhouse effort to build a unique space-flight GPS receiver. This effort has resulted in the Navigator GPS receiver. Navigator's first flight opportunity will come with the STS-125 HST-SM4 mission in August 2008. This paper covers the overall hardware design for the receiver and the difficulties encountered during the transition from the breadboard design to the final flight hardware design. Among the different lessons learned, the paper stresses the importance of selecting and verifying parts that are appropriate for space applications, as well as what happens when these parts are not accurately characterized by their datasheets. Additionally, the paper discusses what analysis needs to be performed when deciding system frequencies and filters. The presentation also covers how to prepare for thermal vacuum testing, and problems that may arise during vibration testing. It also contains what criteria should be considered when determining which portions of a design to create in-house, and which portions to license from a third party. Finally, the paper shows techniques which have proven to be extraordinarily helpful in debugging and analysis.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: ION (Institute of Navigation), National Technical Meeting; Jan 28, 2008; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Advanced Thermal Simulator Testing: Thermal Analysis and Test Results (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Work at the NASA Marshall Space Flight Center seeks to develop high fidelity, electrically heated thermal simulators that represent fuel elements in a nuclear reactor design to support non-nuclear testing applicable to the development of a space nuclear power or propulsion system. Comparison between the fuel pins and thermal simulators is made at the outer fuel clad surface, which corresponds to the outer sheath surface in the thermal simulator. The thermal simulators that are currently being tested correspond to a SNAP derivative reactor design that could be applied for Lunar surface power. These simulators are designed to meet the geometric and power requirements of a proposed surface power reactor design, accommodate testing of various axial power profiles, and incorporate imbedded instrumentation. This paper reports the results of thermal simulator analysis and testing in a bare element configuration, which does not incorporate active heat removal, and testing in a water-cooled calorimeter designed to mimic the heat removal that would be experienced in a reactor core.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: Space Technology and Applications International Forum, STAIF-2008; Feb 10, 2008 - Feb 14, 2008; , Albuquerque, NM
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Wireless Power Transmission Options for Space Solar Power (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Space Solar Power (SSP), combined with Wireless Power Transmission (WPT), offers the far-term potential to solve major energy problems on Earth. In the long-term, we aspire to beam energy to Earth from geostationary Earth orbit (GEO), or even further distances in space. In the near-term, we can beam power over more moderate distances, but still stretch the limits of today s technology. In recent studies, a 100 kWe-class "Power Plug" Satellite and a 10 kWe-class Lunar Polar Solar Power outpost have been considered as the first steps in using these WPT options for SSP. Our current assessments include consideration of orbits, wavelengths, and structural designs to meet commercial, civilian government, and military needs. Notional transmitter and receiver sizes are considered for use in supplying 5 to 15 MW of power. In the longer term, lunar or asteroidal material can be used. By using SSP and WPT technology for near-term missions, we gain experience needed for sound decisions in designing and developing larger systems to send power from space to Earth.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: 27th Annual International Space Development; May 29, 2008 - Jun 01, 2008; Washington, DC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Measurement and Prediction of the Thermomechanical Response of Shape Memory Alloy Hybrid Composite Beams (2008)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An experimental and numerical investigation into the static and dynamic responses of shape memory alloy hybrid composite (SMAHC) beams is performed to provide quantitative validation of a recently commercialized numerical analysis/design tool for SMAHC structures. The SMAHC beam specimens consist of a composite matrix with embedded pre-strained SMA actuators, which act against the mechanical boundaries of the structure when thermally activated to adaptively stiffen the structure. Numerical results are produced from the numerical model as implemented into the commercial finite element code ABAQUS. A rigorous experimental investigation is undertaken to acquire high fidelity measurements including infrared thermography and projection moire interferometry for full-field temperature and displacement measurements, respectively. High fidelity numerical results are also obtained from the numerical model and include measured parameters, such as geometric imperfection and thermal load. Excellent agreement is achieved between the predicted and measured results of the static and dynamic thermomechanical response, thereby providing quantitative validation of the numerical tool.
    Keywords: Composite Materials
    Type: LF99-8568 , Jounal of Intelligent Material Systems and Structures; 19; 2; 129-143
    Format: text
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    NASA TECHNICAL REPORTS
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