The Role of Thermal and Lubricant Boundary Layers in the Transient Thermal Analysis of Spur Gears

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1989
Accession Number
ADA205574

Entities

People

  • Dennis P. Townsend
  • E. El-bayoumy
  • F. C. Choy
  • Lee S. Akin

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Army Aviation
  • Boundary Layer
  • Coefficients
  • Convection
  • Equations
  • Failure Mode And Effect Analysis
  • Friction
  • Heat Energy
  • Heat Flux
  • Heat Transfer
  • Heat Transfer Coefficients
  • Hot Spots
  • Lubricants
  • Mechanical Engineering
  • Steady State
  • Thermal Boundary Layer
  • Thermal Conductivity

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Computational Modeling and Simulation
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).