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  • 1
    facet.materialart.
    Unknown
    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
  • 2
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    Study of the application of hydrogen fuel to long-range subsonic transport aircraft, volume 2 (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The feasibility, practicability, and potential advantages/disadvantages of using liquid hydrogen as fuel in long range, subsonic transport aircraft of advanced design were studied. Both passenger and cargo-type aircraft were investigated. To provide a valid basis for comparison, conventional hydrocarbon (Jet A) fueled aircraft were designed to perform identical missions using the same advanced technology and meeting the same operational constraints. The liquid hydrogen and Jet A fueled aircraft were compared on the basis of weight, size, energy utilization, cost, noise, emissions, safety, and operational characteristics. A program of technology development was formulated.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-132559 , LR-26752-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Study of the application of hydrogen fuel to long-range subsonic transport aircraft. Volume 1: Summary (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of using liquid hydrogen as fuel in advanced designs of long range, subsonic transport aircraft is assessed. Both passenger and cargo type aircraft are investigated. Comparisons of physical, performance, and economic parameters of the LH2 fueled designs with conventionally fueled aircraft are presented. Design studies are conducted to determine appropriate characteristics for the hydrogen related systems required on board the aircraft. These studies included consideration of material, structural, and thermodynamic requirements of the cryogenic fuel tanks and fuel systems with the structural support and thermal protection systems.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-132558 , LR-26752-1
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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