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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Imbalance Response of a Rotor Supported on Flexure Pivot Tilting Pad Journal Bearings in Series With Integral Squeeze Film Dampers

[+] Author and Article Information
L. San Andrés, O. De Santiago

Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123

J. Eng. Gas Turbines Power 125(4), 1026-1032 (Nov 18, 2003) (7 pages) doi:10.1115/1.1492831 History: Received December 01, 2000; Revised March 01, 2001; Online November 18, 2003
Copyright © 2003 by ASME
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References

De Choudhury, P., Hill, M. R., and Paquette, D. J., 1992, “A Flexible Pad Bearing System for a High Speed Centrifugal Compressor,” Proceedings of the 21st Turbomachinery Symposium, Dallas, TX, pp. 57–64.
Zeidan,  F., 1995, “Application of Squeeze Film Dampers,” Turbomach. Int., 11, (Sept./Oct.), pp. 50–53.
De Santiago,  O., Oliveras,  J., and San Andrés,  L., 1999, “Imbalance Response of a Rotor Supported on Open-Ends Integral Squeeze Film Dampers,” ASME J. Eng. Gas Turbines Power, 121, pp. 718–724.
De Santiago, O., and San Andrés, L., 2000, “Dynamic Response of a Rotor-Integral Squeeze Film Damper to Couple Imbalances,” ASME Paper No. 2000-GT-388.
De Santiago, O., and San Andrés, L., 1999, “Imbalance Response and Damping Force Coefficients of a Rotor Supported on End Sealed Integral Squeeze Film Dampers,” ASME Paper No. 99-GT-203.
Edney, S. L., and Nicholas, J. C., 1999, “Retrofitting a Large Steam Turbine With a Mechanically Centered Squeeze Film Damper,” Proceedings of the 28th Turbomachinery Symposium, Houston, TX, pp. 29–40.
Barrett,  L. E., Gunter,  E. J., and Allaire,  P. E., 1978, “Optimum Bearing and Support Damping for Unbalance Response and Stability of Rotating Machinery,” ASME J. Eng. Gas Turbines Power, 100, pp. 89–94.
San Andrés,  L., 1996, “Turbulent Flow, Flexure-Pivot Hybrid Bearing for Cryogenic Applications,” ASME J. Tribol., 118, pp. 190–200.
XLTRC, 1998, Rotordynamics Analysis Software, TAMU Turbomachinery Laboratory.

Figures

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Test rig for measurements of imbalance response of rotor supported on tilting pad bearings and squeeze film dampers
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Assembled ISFD and tilting pad bearing
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Predicted equivalent stiffness and damping synchronous force coefficients for tilting pad bearings and integral dampers, including supports flexibility. Drive and support.
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Summary of imbalance response of rotor supported on FPJBs. Measurement at rotor midspan (vertical direction). Locked ISFDs.
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Shaft centerline motion for test with no imbalance. Rotor supported on FPJBs in series with ISFDs. Drive end, static load: 247.3 N.
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Summary of imbalance response of rotor supported on series FPJB-ISFDs. Measurements at rotor midspan in the vertical and horizontal directions. ISFDs active.
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Measured first critical speed versus imbalance distance for tests on rotor supported on series FPJB-ISFDs
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Average peak-peak rotor response at first critical speed versus imbalance distance for rotor supported on FPJB-ISFDs. Vertical direction and horizontal planes.
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Comparison of predicted and measured horizontal synchronous response for 18.6 gram imbalance (u=49 microns). Measurements at rotor midspan (integral dampers active).

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