Lund’s Contribution to Rotor Stability: The Indispensable and Fundamental Basis of Modern Compressor Design

[+] Author and Article Information
Edgar J. Gunter

Department of Mechanical & Aerospace Engineering, University of Virginia, Charlottesville, VA 22903

J. Vib. Acoust 125(4), 462-470 (Oct 08, 2003) (9 pages) doi:10.1115/1.1605978 History: Received June 01, 2003; Online October 08, 2003
Copyright © 2003 by ASME
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Extended Jeffcott rotor on flexible supports
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Lund 2-mass rotor on damped supports
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Shaft element divided into point and field elements showing the sign convention
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First two computed modes for 11-station beam using Lund transfer matrix method
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Uniform beam a 3-station model showing Lund method of mass lumping
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Damped natural frequencies of a uniform beam with Kb=20,000 lb/in
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Single-degree-of-freedom system
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Critical rigid rotor mass for L/D=0.5 gas bearing vs. dim. speed
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Gas bearing rotor below and above the stability threshold
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Stability of cylindrical gas bearing vs. support damping for ε=0.3, L/D=0.5,Kp=0.10
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Normalized whirl orbits in a sleeve bearing at the onset of instability
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Schematic diagram of a typical turbo-rotor and lumped mass representation




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