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  • AIRCRAFT PROPULSION AND POWER  (1)
  • EARTH RESOURCES AND REMOTE SENSING  (1)
  • SPACECRAFT INSTRUMENTATION  (1)
  • 1980-1984  (3)
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Year
  • 1
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    The wind-speed measurement capability of spaceborne radar altimeters (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: This study represents an attempt to quantitatively assess the capability of a spaceborne radar altimeter to infer ocean surface wind speeds from a measurement of the backscattered power at vertical incidence. The study uses data acquired during 184 near overflights of NOAA data buoys with the GEOS-3 satellite radar altimeter and encompasses a wind-speed range from less than 1 to 18 m/s. An algorithm is derived from the data comparison for converting measurements of the normalized scattering cross section of the ocean surface at 13.9 GHz into estimates of the surface wind speed at the standard anemometer height of 10 m. The algorithm is straightforward and potentially useful for on-board processing of raw altimeter data for the purpose of providing real-time estimates of surface wind speed. For winds in the range of 1 to 18 m/s, the mean difference between the altimeter-inferred winds and the buoy measurements is negligible while the standard deviation of the difference is 1.74 m/s.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Journal of Oceanic Engineering; OE-6; Apr. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Lewis Research Center spin rig and its use in vibration analysis of rotating systems (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Lewis Research Center spin rig was constructed to provide experimental evaluation of analysis methods developed under the NASA Engine Structural Dynamics Program. Rotors up to 51 cm (20 in.) in diameter can be spun to 16,000 rpm in vacuum by an air motor. Vibration forcing functions are provided by shakers that apply oscillatory axial forces or transverse moments to the shaft, by a natural whirling of the shaft, and by an air jet. Blade vibration is detected by strain gages and optical blade-tip motion sensors. A variety of analogy and digital processing equipment is used to display and analyze the signals. Results obtained from two rotors are discussed. A 56-blade compressor disk was used to check proper operation of the entire spin rig system. A special two-blade rotor was designed and used to hold flat and twisted plates at various setting and sweep angles. Accurate Southwell coefficients have been obtained for several modes of a flat plate oriented parallel to the plane of rotation.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TP-2304 , E-1829 , NAS 1.60:2304
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Age discrimination among basalt flows using digitally enhanced LANDSAT imagery (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Digitally enhanced LANDSAT MSS data were used to discriminate among basalt flows of historical to Tertiary age, at a test site in Northwestern Saudi Arabia. Spectral signatures compared favorably with a field-defined classification that permits discrimination among five groups of basalt flows on the basis of geomorphic criteria. Characteristics that contributed to age definition include: surface texture, weathering, color, drainage evolution, and khabrah development. The inherent gradation in the evolution of geomorphic parameters, however, makes visual extrapolation between areas subjective. Therefore, incorporation of spectrally-derived volcanic units into the mapping process should produce more quantitatively consistent age groupings.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E84-10189 , NASA-TM-86141 , NAS 1.15:86141 , Am. Soc. of Photogrammetry; Sep 09, 1984 - Sep 14, 1984; San Antonio, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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