ON CONTROLLING THE FILM THICKNESS IN SELF-ACTING FOIL BEARINGS.

Abstract

Some factors useful in overcoming excessive air gaps in foil bearings are investigated. Since the gaps of interest are small, the foil bearing equations are modified to include the effects of the molecular mean free path. It is shown that by small corners in the solid wall, one can reduce the air film thickness considerably. A change in curvature with continuous slope has also a marked effect on the film thickness. Theoretical prediction curves allowing the calculation of the air gap as a function of corner angle, change in radius of curvature, and the molecular mean free path are presented. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1969
Accession Number
AD0687178

Entities

People

  • A. Eshel

Organizations

  • Ampex

Tags

DTIC Thesaurus Topics

  • Air Gaps
  • Bearings
  • Curvature
  • Equations
  • Foil Bearings
  • Geometric Forms
  • Geometry
  • Lines (Geometry)
  • Mathematics
  • Mean Free Path
  • Thickness

Fields of Study

  • Physics

Readers

  • Economics
  • Fluid Dynamics.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).