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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Experimental Measurements of Actively Controlled Bearing Damping With an Electrorheological Fluid

[+] Author and Article Information
John M. Vance

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

Daniel Ying

Bently Nevada Corporation, 7651 Airport Boulevard, Houston, TX 77059

J. Eng. Gas Turbines Power 122(2), 337-344 (Jan 03, 2000) (8 pages) doi:10.1115/1.483212 History: Received March 09, 1999; Revised January 03, 2000
Copyright © 2000 by ASME
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References

Vance, J. M., Ying, D. Z., and Nikolajsen, J. N., 1999, “Active Control Of Bearing Damping for Aircraft Engine Applications,” ASME Paper 99-GT-18.
Nikolajsen, J. L., and Hoque, M. S., 1988, “An Electroviscous Damper,” NASA CP 3026, Rotordynamic Instability Problems in High-Performance Turbomachinery, pp. 133–141.
Vance, J. M., and San Andres, L. A., 1999, “Analysis of Actively Controlled Coulomb Damping for Rotating Machinery,” ASME Paper 99-GT-175.
Stevens,  N. G., Sproston,  J. L., and Stanway,  R., 1988, “Experimental Study of Electrorheological Torque Transmission,” J. Mech. Trans. Automat. Design, 110, No. 2, pp. 182–188.
Ying, D. Z., 1993, “Experimental Study of an Electrorheological Bearing Damper With a Parametric Control System,” Master of Science thesis, Mechanical Engineering Department, Texas A&M University, College Station, TX.
Thomson, W. T., 1993, Theory of Vibrations With Applications, 4th ed., Prentice Hall, Englewood Cliffs, NJ, pp. 35–36.
Vance, J. M., 1988, Rotordynamics of Turbomachinery, John Wiley & Sons, New York.

Figures

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Rotordynamic test rig for the ER damper
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Cross section of the ER damper
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Curve fit for bearing no. 1 stiffness
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Rap test spectrum, X, no ER fluid
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Rap test spectrum, X, 350 CS fluid, no voltage
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Time trace, 10 CS fluid, 500 V
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Rotor orbits at the first critical speed with the 350 CS fluid
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Orbits at the second critical speed with the 350 CS fluid
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Orbits at the first critical speed with the 10 CS fluid
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Measured Bode plots with 350 CS fluid (X)
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Measured Bode plots with 10 CS fluid (X)
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Theoretical dimensionless bearing force versus frequency ratio for three damping ratios
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Dynamic bearing loads calculated from the measured stiffness and damping coefficients, 10 CS fluid
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Measured runup response with 350 CS fluid and the control system (solid line). Dashed line is expected.
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Measured runup response with 10 CS fluid and the control system (solid line). Dashed line is expected.

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