An experimental study of the effects of bearing support flexibility on rotor stability and unbalance response is presented. A flexible rotor supported by fluid film bearings on flexible supports was used with fifteen support configurations. The horizontal support stiffness was varied systematically while the vertical stiffness was kept constant. The support characteristics were determined experimentally by measuring the frequency response functions of the support structure at the bearing locations. These frequency response functions were used to calculate polynomial transfer functions that represented the support structure. Stability predictions were compared with measured stability thresholds. The predicted stability thresholds agree with the experimental data within a confidence bound for the logarithmic decrement of For unbalance response, the second critical speed of the rotor varied from 3690 rpm to 5200 rpm, depending on the support configuration. The predicted first critical speeds agree with the experimental data within percent. The predicted second critical speeds agree with the experimental data within 3.4 percent. Predictions for the rotor on rigid supports are included for comparison.
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April 2001
Technical Papers
A Flexible Rotor on Flexible Bearing Supports: Stability and Unbalance Response
Jose´ A. Va´zquez, Research Scientist, Assoc. Mem. ASME,
Jose´ A. Va´zquez, Research Scientist, Assoc. Mem. ASME
Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903
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Lloyd E. Barrett, Professor, Mem. ASME,
Lloyd E. Barrett, Professor, Mem. ASME
Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903
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Ronald D. Flack, Professor, Mem. ASME
Ronald D. Flack, Professor, Mem. ASME
Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903
Search for other works by this author on:
Jose´ A. Va´zquez, Research Scientist, Assoc. Mem. ASME
Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903
Lloyd E. Barrett, Professor, Mem. ASME
Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903
Ronald D. Flack, Professor, Mem. ASME
Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22903
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS, Manuscript received Oct. 1999; revised Dec. 2000. Associate Editor: R. P. S. Han.
J. Vib. Acoust. Apr 2001, 123(2): 137-144 (8 pages)
Published Online: December 1, 2000
Article history
Received:
October 1, 1999
Revised:
December 1, 2000
Citation
Va´zquez, J. A., Barrett, L. E., and Flack, R. D. (December 1, 2000). "A Flexible Rotor on Flexible Bearing Supports: Stability and Unbalance Response ." ASME. J. Vib. Acoust. April 2001; 123(2): 137–144. https://doi.org/10.1115/1.1355244
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