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TECHNICAL PAPERS

Operation of Foil Bearings Beyond the Bending Critical Mode

[+] Author and Article Information
Hooshang Heshmat

Mohawk Innovative Technology, Inc., 1037 Watervliet-Shaker Road, Albany, New York 12205-2033. e-mail: miti@albany.net

J. Tribol 122(1), 192-198 (Jul 27, 1999) (7 pages) doi:10.1115/1.555342 History: Received January 21, 1999; Revised July 27, 1999
Copyright © 2000 by ASME
Topics: Bearings , Rotors
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References

Figures

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Flow diagram for the study of foil bearings
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Spectrum of industrial application of compliant surface bearings
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Configuration of test bearings
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(a) 3-D Drawing of foil bearing supported super critical rotor. (b) Foil bearing supported super critical rotor
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The two free-free bending modes of the rotor assembly
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Calculated critical speeds for bearing position #1
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Measured and predicted natural frequencies for bearing A (bearing stiffness is given in Table 3)
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Predicted stability map of bearing A at position #1
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Log decrement at bending critical for different levels of damping
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Predicted stability map for bearing B at different positions
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Predicted stability map for bearing B as a function of position and damping
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Vibration amplitudes at center of shaft for bearings A and B for various bearing positions
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Vibration amplitudes at shaft free end for bearings A and B for various bearing positions
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Rotor response with bearing B at three different positions
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Orbit of shaft center at super bending critical operation
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Orbit of at free end of shaft at super bending critical operation
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Coast-down of bearing B at position #2 from 45,000 rpm
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Waterfall map of coast-down of bearing B at position #2 from 45,000 rpm
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Orbit and frequency content at 45,000 rpm of bearing B at position #2
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Coast-down from 85,000 rpm of bearing B at position #2
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The interplay of stiffness and damping in the bending mode operation of foil bearings

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