On the Behavior of Gas-Lubricated Journal Bearings Subjected to Sinusoidally Time-Varying Loads

[+] Author and Article Information
J. S. Ausman

Guidance and Control Systems Division, Litton Systems, Inc., Woodland Hills, Calif.

J. Basic Eng 87(3), 589-598 (Sep 01, 1965) (10 pages) doi:10.1115/1.3650614 History: Received July 16, 1964; Online November 03, 2011


Linearized steady-state time-dependent solutions to the equations of journal motion are obtained for sinusoidally time-varying radial loads by utilizing the “linearized ph” technique to approximate lubricant pressure forces. An exemplary check for vibration at half-rotor frequency shows that the nonlinear terms can be neglected provided the total eccentricity ratio (static plus dynamic) remains less than one half. A typical journal-bearing frequency response exhibits two distinct types of resonances: One at half-rotor frequency and another at a frequency given by K/M, where K is the effective spring constant due to the bulk modulus of the gas lubricant and M is the mass of the supported rotor. As the static eccentricity ratio ∊0 increases, the amplitude of the half-rotor frequency resonance decreases drastically, but the amplitude of the K/M resonance increases slightly. Rotating load response can be synthesized by superimposing the responses to two 90 deg out-of-phase radial loads acting along perpendicular axes. The resulting response is a nearly circular ellipse centered about the static equilibrium position.

Copyright © 1965 by ASME
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In