EXPERIMENTAL INVESTIGATION OF WHIRL IN SELF-ACTING AIR-LUBRICATED JOURNAL BEARINGS

Abstract

Bearing characteristics influencing the threshold speed at which large-amplitude self-excited whirl occurs incomplete, air-lubricated journal bearings were experimentally investigated. Various combinations of rotors having clearance ratios, Psi = c/r, ranging from 0.000268 to 0.002350 and symmetrical bearing assemblies having slenderness ratios, L' = L/D, ranging from 1/4 to 1 were tested. By varying slenderness and clearance ratios and unit load, by opening or closing supply orifices, or by adding unbalance, the whirl threshold speed could be varied between zero and the limit set by the available power. Experimental methods of identifying the cylindrical and conical modes of synchronous and self-excited whirl are described. The whirl hysteresis region and the nature of whirl at speeds above the threshold are examined. Three methods of avoiding large-amplitude self-excited whirl are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1962
Accession Number
AD0482294

Entities

People

  • David B. Reynolds

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Amplitude
  • Assembly
  • Atmospheres
  • Bearings
  • Clearances
  • Diameters
  • Eccentricity
  • Frequency
  • Hysteresis
  • Inertia
  • Journal Bearings
  • Mass
  • Mechanical Engineering
  • Moment Of Inertia
  • Orientation (Direction)
  • Shape
  • Thrust Bearings

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).