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  • 1
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    Unknown
    An investigation of the transient thermal analysis of spur gears (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    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: ASME PAPER 84-DET-92 , ASME; 541-548
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    The role of thermal and lubricant boundary layers in the transient thermal analysis of spur gears (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An improved convection heat-transfer model has been developed for the prediction of the transient tooth surface temperature of spur gears. The dissipative quality of the lubricating fluid is shown to be limited to the capacity extent of the thermal boundary layer. This phenomenon can be of significance in the determination of the thermal limit of gears accelerating to the point where gear scoring occurs. Steady-state temperature prediction is improved considerably through the use of a variable integration time step that substantially reduces computer time. Computer-generated plots of temperature contours enable the user to animate the propagation of the thermal wave as the gears come into and out of contact, thus contributing to better understanding of this complex problem. This model has a much better capability at predicting gear-tooth temperatures than previous models.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-101435 , E-4413 , NAS 1.15:101435 , AVSCOM-TR-88-C-032 , AD-A205574 , International Power Transmission and Gearing Conference; Apr 25, 1989 - Apr 27, 1989; Chicago, IL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    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
  • 4
    facet.materialart.
    Unknown
    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
  • 5
    facet.materialart.
    Unknown
    The role of thermal and lubricant boundary layers in the transient thermal analysis of spur gears (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An improved convection heat-transfer model has been developed for the prediction of the transient tooth surface temperature of spur gears. The dissipative quality of the lubricating fluid is shown to be limited to the capacity extent of the thermal boundary layer. This phenomenon can be of significance in the determination of the thermal limit of gears accelerating to the point where gear scoring occurs. Steady-state temperature prediction is improved considerably through the use of a variable integration time step that substantially reduces computer time. Computer-generated plots of temperature contours enable the user to animate the propagation of the thermal wave as the gears come into and out of contact, thus contributing to better understanding of this complex problem. This model has a much better capability at predicting gear-tooth temperatures than previous models.
    Keywords: MECHANICAL ENGINEERING
    Type: 1989 International Power Transmission and Gearing Conference; Apr 25, 1989 - Apr 28, 1989; Chicago, IL; United States
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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