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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Dynamic Response of Squeeze Film Dampers Operating With Bubbly Mixtures

[+] Author and Article Information
Luis San Andres, Oscar C. De Santiago

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

J. Eng. Gas Turbines Power 126(2), 408-415 (Jun 07, 2004) (8 pages) doi:10.1115/1.1690770 History: Received December 01, 2001; Revised March 01, 2002; Online June 07, 2004
Copyright © 2004 by ASME
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References

De Santiango,  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.
Zeidan, F., and Vance, J. M., 1989, “Cavitation and Air Entrainment Effects on the Response of Squeeze Film Supported Rotors,” ASME Paper No. 89-Trib-52.
Diaz,  S., and San Andrés,  L., 2001, “A Model for Squeeze Film Dampers Operating With Air Entrainment and Validation With Experiments,” ASME J. Tribol., 123, pp. 125–133.
Dı́az, S. E., 1999, “The Effect of Air Entrapment on the Performance of Squeeze Film Dampers; Experiments and Analysis,” Ph.D. dissertation, Mechanical Engineering, Texas A&M University, May.
San Andrés, L., Dı́az, S., and Rodrı́guez, L., 2001, “Sine Sweep Load Versus Impact Excitations and Their Influence on the Damping Coefficients of a Bubbly Oil Squeeze Film Damper,” 56th STLE Annual Meeting, Orlando, FL, May, Paper No. STLE 01-NP-18.
Diaz,  S., and San Andrés,  L., 1999, “A Method for Identification of Bearing Force Coefficients and Its Application to a Squeeze Film Damper With a Bubbly Lubricant,” STLE Tribol. Trans., 42(4), pp. 739–746.
Ewins, D. J., 2000, Modal Testing, Theory, Practice and Application, 2nd Ed., Research Study Press, LTD, Hertfordshire, UK.
San Andrés,  L., and De Santiago,  O., 2001, “Imbalance Response of a Rotor Supported on Flexure Pivot Tilting Pad Journal Bearings in Series With Integral Squeeze Film Dampers,” ASME J. Eng. Gas Turbines Power, 125, pp. 1026–1032.
San Andrés,  L., and Lubell,  D., 1998, “Imbalance Response of a Test Rotor Supported on Squeeze Film Dampers,” ASME J. Eng. Gas Turbines Power, 120, pp. 397–404.

Figures

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Experimental and predicted damping force versus air content in a lubricated mixture. Whirl frequency=8.33 Hz, vertical bars denote experimental uncertainty. Source 1.
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Test rig for measurements of imbalance response of rotor supported on hydrodynamic bearings and squeeze film dampers
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Configuration of integral squeeze film damper and flexure pivot tilting pad journal bearing
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Configuration and main dimensions of cylindrical squeeze film damper and plain journal bearing
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Response of test rotor to impacts exerted on middle disk. Dampers operating with 100% (dry lands), 50%, and 0% air content (pure oil). (a) horizontal, (b) vertical motions.
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Appearance of lubricant mixture supplied into squeeze film dampers. 30.2% air volume fraction.
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Damping coefficients versus air volume fraction as derived from impact responses. Estimates from single point and over a frequency range. Contribution of two dampers after subtraction of structural (dry) damping.
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Imbalance response of test rotor close to the middle disk for pure oil and 50% air volume fraction (a) horizontal, (b) vertical.

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