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  • 2005-2009
  • 1980-1984  (7)
  • 1960-1964
  • 1984  (7)
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Keywords
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  • 2005-2009
  • 1980-1984  (7)
  • 1960-1964
Year
  • 1
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    Unknown
    Volume measurement in vivo using positron tomography (1984)
    Elsevier
    Details
    Publication Date: 1984-03-01
    Print ISSN: 0167-5087
    Electronic ISSN: 1872-9606
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Increased sensitivity and field of view for a rotating positron camera (1984)
    Institute of Physics
    Details
    Publication Date: 1984-11-01
    Print ISSN: 0031-9155
    Electronic ISSN: 1361-6560
    Topics: Biology , Medicine , Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 3
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    NASA transmission research and its probable effects on helicopter transmission design (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Transmissions studied for application to helicopters in addition to the more conventional geared transmissions include hybrid (traction/gear), bearingless planetary, and split torque transmissions. Research is being performed to establish the validity of analysis and computer codes developed to predict the performance, efficiency, life, and reliability of these transmissions. Results of this research should provide the transmission designer with analytical tools to design for minimum weight and noise with maximum life and efficiency. In addition, the advantages and limitations of drive systems as well as the more conventional systems will be defined.
    Keywords: MECHANICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Status of Understanding for Gear Materials (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-11
    Description: A wide variety of gear materials is available today for the gear designer. The choice of which material to use should be based on the requirements of the application and will include the operating conditions of load, speed, and temperature in addition to reliability, weight, noise limitation, accuracy, and cost. In aircraft applications such as helicopters, V/STOL aircraft, and turboprops, the dominant factors to be considered are reliability and weight. The following gear materials are reviewed herein with an emphasis upon mechanical properties, cost, and durability: plastics, nonferrous metals, copper alloys, iron alloys, metal powders, and steels.
    Keywords: MECHANICAL ENGINEERING
    Type: Tribology in the 80's, vol. 2; p 795-809
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Effect of lubricant extreme-pressure additives on surface fatigue life of AISI 9310 spur gears (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Surface fatigue tests were conducted with AISI 9310 spur gears using a formulated synthetic tetraester oil (conforming to MIL-L-23699 specifications) as the lubricant containing either sulfur or phosphorus as the EP additive. Four groups of gears were tested. One group of gears tested without an additive in the lubricant acted as the reference oil. In the other three groups either a 0.1 wt % sulfur or phosphorus additive was added to the tetraester oil to enhance gear surface fatigue life. Test conditions included a gear temperature of 334 K (160 F), a maximum Hertz stress of 1.71 GPa (248 000 psi), and a speed of 10,000 rpm. The gears tested with a 0.1 wt % phosphorus additive showed pitting fatigue life 2.6 times the life of gears tested with the reference tetraester based oil. Although fatigue lives of two groups of gears tested with the sulfur additive in the oil showed improvement over the control group gear life, the results, unlike those obtained with the phosphorus oil, were not considered to be statistically significant.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-2408 , E-2042 , NAS 1.60:2408
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    An investigation of the transient thermal analysis of spur gears (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A finite element computer program is developed for evaluating the transient behavior of surface temperature in high performance spur gears. The time dimension is implemented using two and three point finite difference schemes. The different schemes are provided for the purpose of numerical stability and convergence studies. A detailed explanation of the gear cooling process leading to the establishment of a modified Blok model is also included. Other conventional models for approximating the heat transfer coefficients are available for comparison. Preliminary results are given showing snap shots of gear temperature contours at the initial stages of tooth engagement.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-83724 , E-2192 , NAS 1.15:83724 , Intern. Power Transmission and Gearing Conf.; Oct 10, 1984 - Oct 12, 1984; Cambridge, MA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Parameter studies of gear cooling using an automatic finites element mesh generator (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The range of accuracies achieved in the gear tooth temperature using an automatic finite element mesh generator were investigated. Gear web contribution to the gear cooling process was studied by introducing a varying size hole at the center of the gear because of the versatility of program TARG in allowing different heat transfer coefficients in different areas of the gear tooth. A study was carried out to evaluate the contribution of the loaded and unloaded faces as well as the top and bottom lands. A general purpose two-dimensional finite element preprocessor ATOGEN has been developed for automatic generation of a finite element mesh over a pie-shaped sector of a gear. The program was used for facilitating the input to an upgraded version of a previously developed program for the thermal analysis of running gears (TARG). The latter program determined the steady state temperature distribution throughout the specified gear. The automatic mesh generator program includes a band width minimization routine for reducing computer cost.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-83721 , E-2187 , NAS 1.15:83721 , Intern. Power Transmission and Gearing Conf.; Oct 10, 1984 - Oct 12, 1984; Cambridge, MA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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