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  • Other Sources  (83)
  • MACHINE ELEMENTS AND PROCESSES  (49)
  • AUXILIARY SYSTEMS  (34)
  • 1970-1974  (83)
  • 1965-1969
  • 1950-1954
  • 1935-1939
  • 1973  (83)
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  • Other Sources  (83)
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  • 1970-1974  (83)
  • 1965-1969
  • 1950-1954
  • 1935-1939
Year
  • 1
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    Noncontacting devices to indicate deflection and vibration of turbopump internal rotating parts (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The research is reported which was conducted to develop devices for measuring vibrations and deflections of parts, such as impellers, shafts, turbine wheels, and inducers in operating turbopumps. Three devices were developed to the breadboard stage: ultrasonic Doppler transducer, flash X-rays, and light-pipe reflectance. It was found that the X-ray technique is applicable to the shaft assembly and the turbine seal of the J-2 pump, and the light-pipe-reflectance device appears to be ideal for cryogenic pump sections.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-124208
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Some observations of the relationship between film thickness and load in high Hertz pressure sliding elastohydrodynamic contacts. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 73-LUB-D
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Development of a uninterrupted power system: ac and dc to dc converter (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This program covered the design, fabrication and testing of an advanced development model uninterrupted power system. The input and output requirements imposed on the power processor were specified such that the unit is electrically interchangeable with existing power systems used by the Federal Aviation Administration in installations which have a history of failure due to electrical transient conditions. Input power is from either of two single-phase ac power sources or batteries with electronic selection and transfer between power sources. Battery reconditioning is automatic when either ac source is present. The output power is rated at 84OW; the nominal output is 24V at 35A. Within the 84OW limit, the regulated output voltage is adjustable from 22V to 30Vdc. Protection against continuous overloading or short circuit is provided. The unit is packaged in a standard 19-inch rack mount configuration with 7-inch panel height. Controls are on the front panel with power input and output through connectors on the rear surface. Cooling is by free convection from fin areas located on the side and rear panels. The packaged unit weighs 52.8 lbs., which can be reduced significantly if a three-phase ac power source is used.
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-CR-134497
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Performance of high speed ball bearings with lead and lead alloy plated retainers in liquid hydrogen at 1.2 million DN (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Ball bearings with lead- and lead-alloy-coated retainers were operated in liquid hydrogen at 30,000 rpm under a thrust load of 400 lb. Bearing lives were compared using different: (1) lead- and lead-alloy coatings, (2) coating thicknesses, (3) substrate materials, (4) retainer locating surfaces, and (5) plating techniques. Longer bearing run times were achieved using retainers with a lead-tin-copper alloy coating electroplated onto a leaded-bronze material and an aluminum-bronze alloy. Thirty percent of the bearings tested achieved the desired objective of 10 hours. All of the lead-alloy coated retainers exceeded this objective. A coating thickness of at least 0.0014 in. was used for all bearings exceeding the 10-hour goal.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68268 , E-7573 , Joint Lubrication Conf; Oct 16, 1973 - Oct 18, 1973; Atlanta GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Texturing in metals as a result of sliding (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Sliding friction experiments were conducted with copper, nickel, iron, and cobalt sliding on themselves in air and argon. The resulting wear surfaces were examined with X-ray analysis to determine if surface texturing had occurred as a result of sliding. Results of the investigation indicate that, for the face-centered-cubic metals copper and nickel, a (111) texture develops with the (111) planes tilted 10 deg in the direction of sliding. The body-centered-cubic metal iron exhibited a (110) texture with the (100) direction oriented in the direction of sliding. It also exhibited a 10 deg tilt in the direction of sliding. The environment influenced the results in that the degree of texture observed in argon was less than that seen in air for iron. No texturing was observed for the close-packed-hexagonal metal cobalt. Recrystallization was observed with copper as a result of sliding.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7136 , E-7160
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Dynamics of moisture diffusion through a partially liquid filled porous matrix. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Models for unsteady water transport in fuel cell configurations of Bacon-Pratt and Whitney type are derived. Tests with a specially constructed isothermal cell producing no water and order of magnitude analysis show that diffusion through the liquid alone cannot account for the observed behavior. An analytical solution which includes diffusion in both the liquid and the gas spaces of the matrix is in better agreement with the data than models which consider diffusion in either the liquid or in the gas phase alone.
    Keywords: AUXILIARY SYSTEMS
    Type: AIChE Journal; 19; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Evaluation program for secondary spacecraft cells (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A life cycle test of secondary electric batteries for spacecraft applications was conducted. A sample number of nickel cadmium batteries were subjected to general performance tests to determine the limit of their actual capabilities. Weaknesses discovered in cell design are reported and aid in research and development efforts toward improving the reliability of spacecraft batteries. A statistical analysis of the life cycle prediction and cause of failure versus test conditions is provided.
    Keywords: AUXILIARY SYSTEMS
    Type: NASA-CR-132801 , QEEL/C-73-4 , AR-9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Performance of high-speed ball bearings with lead and lead-alloy-plated retainers in liquid hydrogen at 1.2 million DN (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 73-LUB-22 , Joint Lubrication Conference; Oct 15, 1973 - Oct 18, 1973; Atlanta, GA; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The influence of nondestructive inspection parameters on the preproof and postproof fatigue crack detection limits for fracture mechanics applications (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The results of a preliminary NDI program to examine the variability of flaw size detection limits in terms of specimen thickness and NDI procedures is reviewed and reanalyzed in terms of the variables involved. Penetrant, X-ray, eddy current, and ultrasonic methods developed independently at three separate laboratories were used to examine specimens having a range of thickness. The results are discussed in terms of the variables of thickness and NDI procedures.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Symposium on Nondestructive Evaluation; Apr 25, 1973 - Apr 27, 1973; San Antonio, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Interface requirements for electric propulsion power processing equipment (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Power processor interfaces, internal functions, and design techniques established for the 30-cm ion engine power processor are discussed. The interfaces include the ion engine interface, the spacecraft interface, source/load interactions, protection, and optimization criteria. In the analysis, particular attention is given to the interaction and protection aspects. A breadbord system designed and built for the 30-cm ion engine is discussed which will be used as an engineering tool to establish guidelines for electric propulsion systems.
    Keywords: AUXILIARY SYSTEMS
    Type: AIAA PAPER 73-1108 , Electric Propulsion Conference; Oct 31, 1973 - Nov 02, 1973; Lake Tahoe, NV
    Format: text
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    NASA TECHNICAL REPORTS
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