Experimental-Theoretical Comparison of Instability Onset Speeds for a Three Mass Rotor Supported by Step Journal Bearings

[+] Author and Article Information
J. C. Nicholas

Turbo Engineering Sciences, Ingersoll-Rand Co., Phillipsburg, N. J. 08865

L. E. Barrett

Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Va. 22901

M. E. Leader

Monsanto Chemical Intermediates Co., Texas City, Tex. 77568

J. Mech. Des 102(2), 344-351 (Apr 01, 1980) (8 pages) doi:10.1115/1.3254750 History: Received June 07, 1979; Online November 17, 2009


Theoretically predicted instability onset speeds are compared to the experimental instability threshold speeds for a simple three mass flexible rotor supported by five geometrically different sets of step journal bearings and a set of two axial groove bearings. The near optimum step bearing designs increase the instability onset speed by around 109 percent in one case and 41 percent in another compared to two axial groove bearings. The off optimum designs increase the instability speed by 18, 30 and 35 percent. The theoretical stability analysis predicts the general trends in the experimental data.

Copyright © 1980 by ASME
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