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TECHNICAL PAPERS

A Flexible Rotor on Flexible Bearing Supports: Stability and Unbalance Response

[+] Author and Article Information
José A. Vázquez, Lloyd E. Barrett, Ronald D. Flack

Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903

J. Vib. Acoust 123(2), 137-144 (Dec 01, 2000) (8 pages) doi:10.1115/1.1355244 History: Received October 01, 1999; Revised December 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Experimental apparatus (dimensions are in mm)
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Bearing stiffness and damping coefficients
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Sketch of the experimental setup
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Detail of the bearing housing and flexible supports
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Flexible support design (dimensions are in mm)
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Estimated static support stiffness
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Spectral map of the rotor displacement in the horizontal direction. Middle stiffness range.
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Schematics of the support testing
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Measured FRF and fitted polynomial transfer function for Gxx. Response in the right support; excitation in the right support. Support’s static stiffness 1.27 106 N/m.
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Measured FRF and fitted polynomial transfer function for Gxx. Response in the right support; excitation in the right support. Support’s static stiffness 1.00 106 N/m.
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Measured FRF and fitted polynomial transfer function for Gxx. Response in the right support; excitation in the right support. Support’s static stiffness 1.38 106 N/m.
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Effect of the support horizontal static stiffness on the controlled support frequency
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Sketch of the analytical procedure
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Comparison between predicted and measured stability threshold
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Unbalance response in the horizontal direction at sensor location 2. Unbalance Distribution 1. Horizontal stiffness =1.00 106 N/m.
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Unbalance response in the horizontal direction at sensor location 2. Unbalance Distribution 1. Horizontal stiffness =1.19 106 N/m.
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Unbalance response in the horizontal direction at sensor location 2. Unbalance Distribution 1. Horizontal stiffness =1.38 106 N/m.
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Comparison between measured unbalance response for support with Horizontal stiffness = 1.00 106 N/m and single mass support model. Sensor Location 2. Horizontal direction. Unbalance Distribution 1.
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Unbalance response in the horizontal direction at sensor location 3. Unbalance Distribution 2. Horizontal stiffness =1.00 106 N/m.
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Unbalance response in the horizontal direction at sensor location 3. Unbalance Distribution 2. Horizontal stiffness =1.19 106 N/m.
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Unbalance response in the horizontal direction at sensor location 3. Unbalance Distribution 2. Horizontal stiffness =1.38 106 N/m.
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Comparison between measured unbalance response for support with Horizontal stiffness = 1.00 106 N/m and Single mass supports. Sensor Location 3. Horizontal direction. Unbalance Distribution 2.
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Comparison between predicted and measured critical speeds
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Percentage difference between predicted and measured critical speeds
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Comparison between predicted and measured amplitudes at the first and second critical speeds

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