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  • Aircraft Design, Testing and Performance  (11)
  • SPACECRAFT PROPULSION AND POWER  (9)
  • Astronomy  (8)
  • 1
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    Space station electrical power system (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The purpose of this paper is to describe the design of the Space Station Electrical Power System. This includes the Photovoltaic and Solar Dynamic Power Modules as well as the Power Management and Distribution System (PMAD). In addition, two programmatic options for developing the Electrical Power System will be presented. One approach is defined as the Enhanced Configuration and represents the results of the Phase B studies conducted by the NASA Lewis Research Center over the last two years. Another option, the Phased Program, represents a more measured approach to reaching about the same capability as the Enhanced Configuration.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-100140 , E-3692 , NAS 1.15:100140 , IAF-87-234
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Brayton Power Conversion System Parametric Design Modelling for Nuclear Electric Propulsion (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The parametrically based closed Brayton cycle (CBC) computer design model was developed for inclusion into the NASA LeRC overall Nuclear Electric Propulsion (NEP) end-to-end systems model. The code is intended to provide greater depth to the NEP system modeling which is required to more accurately predict the impact of specific technology on system performance. The CBC model is parametrically based to allow for conducting detailed optimization studies and to provide for easy integration into an overall optimizer driver routine. The power conversion model includes the modeling of the turbines, alternators, compressors, ducting, and heat exchangers (hot-side heat exchanger and recuperator). The code predicts performance to significant detail. The system characteristics determined include estimates of mass, efficiency, and the characteristic dimensions of the major power conversion system components. These characteristics are parametrically modeled as a function of input parameters such as the aerodynamic configuration (axial or radial), turbine inlet temperature, cycle temperature ratio, power level, lifetime, materials, and redundancy.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-191135 , NAS 1.26:191135 , REPT-93RC-010143 , E-8345
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    NASA TECHNICAL REPORTS
  • 3
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    Space Station Electrical Power System (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The purpose of this paper is to describe the design of the Space Station Electrical Power System. This includes the Photovoltaic and Solar Dynamic Power Modules as well as the Power Management and Distribution System (PMAD). In addition, two programmatic options for developing the Electrical Power System will be presented. One approach is defined as the Enhanced Configuration and represents the results of the Phase B studies conducted by the NASA Lewis Research Center over the last two years. Another option, the Phased Program, represents a more measured approach to reaching about the same capability as the Enhanced Configuration.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IAF PAPER 87-234
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Change Detection Experiments Using Low Cost UAVs (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: This paper presents the progress in the development of a low-cost change-detection system. This system is being developed to provide users with the ability to use a low-cost unmanned aerial vehicle (UAV) and image processing system that can detect changes in specific fixed ground locations using video provided by an autonomous UAV. The results of field experiments conducted with the US Army at Ft. A.P.Hill are presented.
    Keywords: Aircraft Design, Testing and Performance
    Type: Infotech@Aerospace; 26-29 Sept. 2005; Arlington, VA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Design, Development, and Testing of a Compound Wing V/TOL small UAS (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: This paper discusses the development and testing of an innovative small UAS (Unmanned Aircraft System). The design of the vehicle was driven by the need to both have long endurance yet still have the convenience of V/TOL (Vertical Take-Off and Landing) operation. The paper discusses some of the design considerations and configurations evaluated in searching for a configuration that met the demanding mission requirements. The paper also discusses some aspects of the compound wing and experimental testing conducted to discern the optimum parameters for the wing's design. The paper discusses the results of the preliminary flight testing and outlines further research to be conducted.
    Keywords: Aircraft Design, Testing and Performance
    Type: NF1676L-19089 , SciTech 2015; Jan 05, 2015 - Jan 09, 2015; Kissimmee, FL; United States
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  • 6
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    Status of the SOFIA Observatory (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The SOFIA observatory has been in routine science operations since returning in January from a 6 month-long heavy maintenance period for the aircraft and the telescope assembly. These operations include a successful 6 week deployment to the Southern hemisphere. This presentation will provide an update to the current operational status of the SOFIA observatory, concentrating on the improvements and upgrades that have been implemented since the heavy maintenance period.
    Keywords: Astronomy
    Type: ARC-E-DAA-TN23899 , International Astronomical Union General Assembly; Aug 03, 2015 - Aug 14, 2015; Honolulu, HI; United States
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  • 7
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    Spitzer Infrared Spectrograph Observations of L, M, and T Dwarfs (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: We present here the first mid-infriared spectra of brown dwarfs, together with observations of a low-mass star. Our targets are the M3.5 dwarf GJ 1001 A, the L8 dwarf DENIS-P JO255-4700, and the T1/T6 binary system epsilon Indi Ba/Bb. As expected, the mid- infrared spectral morphology of these objects changes rapidly with spectral class due to the changes in atmospheric chemistry resulting from their differing effective temperatures and atmospheric structures. By taking advantage of the unprecedented sensitivity of the Infrared Spectrograph instrument of the Spitzer Space Telescope we have detected for the first time the 7.6 micron methane band and confirmed the presence of ammonia in a T dwarf atmosphere.
    Keywords: Astronomy
    Type: SSA-137
    Format: text
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  • 8
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    Toward Large-Area Sub-Arcsecond X-Ray Telescopes (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The future of x-ray astronomy depends upon development of x-ray telescopes with larger aperture areas (approx. = 3 square meters) and fine angular resolution (approx. = 1 inch). Combined with the special requirements of nested grazing-incidence optics, the mass and envelope constraints of space-borne telescopes render such advances technologically and programmatically challenging. Achieving this goal will require precision fabrication, alignment, mounting, and assembly of large areas (approx. = 600 square meters) of lightweight (approx. = 1 kilogram/square meter areal density) high-quality mirrors at an acceptable cost (approx. = 1 million dollars/square meter of mirror surface area). This paper reviews relevant technological and programmatic issues, as well as possible approaches for addressing these issues-including active (in-space adjustable) alignment and figure correction.
    Keywords: Astronomy
    Type: M14-4110 , SPIE Optics + Photonics; Aug 17, 2014 - Aug 21, 2014; San Diego, CA; United States
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  • 9
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    Toward Active X-ray Telescopes II (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In the half century since the initial discovery of an astronomical (non-solar) x-ray source, the sensitivity for detection of cosmic x-ray sources has improved by ten orders of magnitude. Largely responsible for this dramatic progress has been the refinement of the (grazing-incidence) focusing x-ray telescope. The future of x-ray astronomy relies upon the development of x-ray telescopes with larger aperture areas (greater than 1 m2) and finer angular resolution (less than 1.). Combined with the special requirements of grazing-incidence optics, the mass and envelope constraints of space-borne telescopes render such advances technologically challenging.requiring precision fabrication, alignment, and assembly of large areas (greater than 100 m2) of lightweight (approximately 1 kg m2 areal density) mirrors. Achieving precise and stable alignment and figure control may entail active (in-space adjustable) x-ray optics. This paper discusses relevant programmatic and technological issues and summarizes progress toward active x-ray telescopes.
    Keywords: Astronomy
    Type: M11-1524 , M12-2031 , M12-2148 , The International Society for Optics and Photonics (SPIE) 2012; Aug 12, 2012 - Aug 16, 2012; San Diego, CA; United States
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  • 10
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    The Rapidly Rotating Sun (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Convection in the solar interior is thought to comprise structures at a continuum of scales, from large to small. This conclusion emerges from phenomenological studies and numerical simulations though neither covers the proper range of dynamical parameters of solar convection. In the present work, imaging techniques of time-distance helioseismology applied to observational data reveal no long-range order in the convective motion. We conservatively bound the associated velocity magnitudes, as a function of depth and the spherical-harmonic degree l to be 20-100 times weaker than prevailing estimates within the wavenumber band l 〈 60. The observationally constrained kinetic energy is approximately a thousandth of the theoretical prediction, suggesting the prevalence of an intrinsically different paradigm of turbulence. A fundamental question arises: what mechanism of turbulence transports the heat ux of a solar luminosity outwards? The Sun is seemingly a much faster rotator than previously thought, with advection dominated by Coriolis forces at scales l 〈 60.
    Keywords: Astronomy
    Type: GSFC.JA.6127.2012
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