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  • Other Sources  (143)
  • MACHINE ELEMENTS AND PROCESSES  (143)
  • 1970-1974  (142)
  • 1930-1934  (1)
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  • Other Sources  (143)
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Keywords
Years
Year
  • 1
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    Investigation of noise in gear transmissions by the method of mathematical smoothing of experiments (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-28
    Description: A rotatable central component smoothing method is used to analyze rotating gear noise spectra. A matrix is formulated in which the randomized rows correspond to various tests and the columns to factor values. Canonical analysis of the obtained regression equation permits the calculation of optimal speed and load at a previous assigned noise level.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Cybernetic Diagnostics of Mech. Systems with Vibro-acoustic Phenomena (NASA-TT-F-14899); p 115-117
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Process of manufacturing small-module gears with internal coupling (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The small module geared coupling of an undulatory transmission is considered. Versions of the manufacture of gears with internal coupling and the instruments and equipment used, are reported.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Technol. for the Production of Space Equipment (NASA-TT-F-15766); p 77-79
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Summary of nondestructive testing theory and practice (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The ability to fabricate design critical and man-rated aerospace structures using materials near the limits of their capabilities requires a comprehensive and dependable assurance program. The quality assurance program must rely heavily on nondestructive testing methods for thorough inspection to assess properties and quality of hardware items. A survey of nondestructive testing methods is presented to provide space program managers, supervisors and engineers who are unfamiliar with this technical area with appropriate insight into the commonly accepted nondestructive testing methods available, their interrelationships, used, advantages and limitations. Primary emphasis is placed on the most common methods: liquid penetrant, magnetic particle, radiography, ultrasonics and eddy current. A number of the newer test techniques including thermal, acoustic emission, holography, microwaves, eddy-sonic and exo-electron emission, which are beginning to be used in applications of interest to NASA, are also discussed briefly.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-2120 , BMI-NLVP-TM-71-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Fabrication and test of a space power boiler feed electromagnetic pump. Part 1: Design and manufacture of pump (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A three-phase helical induction electromagnetic (EM) pump has been designed and built. This pump was designed for use as the boiler-feed pump of a potassium Rankine-cycle space electric power system. The pump is constructed of high temperature materials including a T-111 duct, Hiperco 27 magnetic material, nickel clad silver conductor wire, and a completely inorganic insulation system. The pump is designed to deliver 3.25 lb/sec potassium at 1000 F with a developed head of 240 psi while being cooled by 800 F NaK. At these conditions, the overall pump efficiency is expected to be 18%.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-1949 , GESP-459-PT-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Effects of vibration and shock on the performance of gas-bearing space power Brayton cycle turbomachinery. 1 - Half- sine shock and sinusoidal vibration (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Half-sine shock and sinusoidal vibration tests of gas bearing supported rotor assembly and effects on mechanical performance of Brayton cycle space-power turbomachinery
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-1762 , MTI-70TR19
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Premium quality 5A1-2.5 Sn ELI titanium production (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Preliminary design and reliability analysis conducted on the turbopump for the NERVA 75,000 full flow cycle engine, indicated that the turbopump bearings were the most critical turbopump parts in meeting the 10 hour life at the required turbopump reliability of .99978. The analysis revealed that significant reductions (approximately a factor of 3.25) in bearing loads would be achieved by fabricating the rotating parts from titanium in lieu of A286 or 718. This is basically due to the difference in density of the materials and the resulting mass effect on the location of the first and second stick mode critical speeds. For the selected rotor configuration, the lighter material has a first critical speed at approximately 36,000 rpm, while that of the heavier material has a first critical at approximately 27,000 rpm. As the operating range of the turbopump is from 0 to 30,000 rpm, the heavier material would have a stick mode critical in the operating range.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-132227 , N8300R:72-103
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Mainshaft seals for small gas turbine engines (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An experimental evaluation of mainshaft seals for small gas turbine engines was conducted with shaft speeds to 213 m/s (700 ft/sec), air pressures to 148 Newtons per square centimeter abs. (215 psia), and air temperatures to 412k(282 F). A radial face seal incorporating self-acting geometry for lift augmentation was evaluated. In addition, three conventional carbon seal types (face, circumferential segmented, and rotating ring) were run for comparison. Test results indicated that the conventional seals used in this evaluation may not be satisfactory in future advanced engines because of excessive air leakage. On the other hand, the self-acting face seal was shown to have the potential capability of limiting leakages to one-half that of the conventional face seals and one-fifth that of conventional ring seals. A 150-hour endurance test of the self-acting face seal was conducted.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-71558 , E-7983 , Lubrication Conf.; Oct 08, 1974 - Oct 10, 1974; Montreal
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Development of a method for fabricating metallic matrix composite shapes by a continuous mechanical process (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The continuing efforts in upscaling to produce larger diameter Al/B tubes are described. While the basic methodology remains unchanged, the larger volume of acrylic binder material and its removal by dissolution in toluene had to be performed by dynamic scrubbing. Similarly, the boron and MCF continuous length requirements increased when a 6 foot long by 7 inches wide mat was needed. These modifications and associated problems are described fully with schematics. Also included are seven experiments conducted to prepare larger tubes. The thermal profile, drawing speeds, and furnace positions in the draw bench bay are presented along with metallographic evidence of composite cross sections.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-124407 , QPR-8/9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Failure mode analysis to predict product reliability. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The failure mode analysis (FMA) is described as a design tool to predict and improve product reliability. The objectives of the failure mode analysis are presented as they influence component design, configuration selection, the product test program, the quality assurance plan, and engineering analysis priorities. The detailed mechanics of performing a failure mode analysis are discussed, including one suggested format. Some practical difficulties of implementation are indicated, drawn from experience with preparing FMAs on the nuclear rocket engine program.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 72-DE-17 , American Society of Mechanical Engineers, Design Engineering Conference and Show; May 08, 1972 - May 11, 1972; Chicago, IL
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Effects of energy dissipation in the bearing assemblies of dual-spin spacecraft (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Proper evaluation of the effects of bearing assembly flexibility on the attitude stability of dual-spin spacecraft may explain the observed anomalies in the motion of a recently launched satellite. A convenient, but approximate, expression with which to gauge these effects is presented, as in an example of a possible application of this expression in a design role.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA. Goddard Space Flight Center 5th Aerospace Mech. Symp.; p 143-148
    Format: text
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    NASA TECHNICAL REPORTS
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