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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Friction Damping of Interlocked Vane Segments: Experimental Results

[+] Author and Article Information
T. Berruti, S. Filippi, M. M. Gola

Dip. Ing. Meccanica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

S. Salvano

FIAT AVIO, Via Nizza 312, 10127 Torino, Italy

J. Eng. Gas Turbines Power 124(4), 1018-1024 (Sep 24, 2002) (7 pages) doi:10.1115/1.1494097 History: Received December 01, 2000; Revised March 01, 2001; Online September 24, 2002
Copyright © 2002 by ASME
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References

Berruti, T., Filippi, S., Goglio, L., and Gola, M. M., 2000, “A Test Rig for Frictionally Damped Bladed Segments,” 45th ASME Gas Turbine and Aeroengine Congress and Exhibition, Munich (Germany).
Berruti, T., Filippi, S., Goglio, L., and Gola, M. M., 1999, “Forced Vibrations of Frictionally Damped Stator Segments,” 44th ASME Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, IN.
Fouvry,  S., Kapsa,  Ph., and Vincent,  L., 1997, “Developments of Fretting Sliding Criteria to Qualify the Local Friction Coefficient Evolution Under Partial Slip Condition,” Tribology for Energy Conservation, . et al., eds., Tribol. Ser., 34, pp. 161–172.
Fouvry,  S., Kapsa,  Ph., and Vincent,  L., 1995, “Analysis of Sliding Behavior for Fretting Loading, Determination of Transition Criteria,” Wear, 185, pp. 35–46.
Waterhouse, R. B., 1981, Fretting Fatigue, Waterhouse, ed., Applied Science Pub., UK.
Sextro, W., 2000, “The Calculation of the Forced Response of Shrouded Blades With Friction Contacts and Its Experimental Verification” 45th ASME Gas Turbine and Aeroengine Congress and Exhibition, Munich (Germany).
Csaba, G., 1999, “Modeling of a Microslip Friction Damper Subjected to Translation and Rotation,” 44th ASME Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, IN.
Sanliturk,  K. Y., Imregun,  M., and Ewins,  D. J., 1997, “Harmonic Balance Vibration Analysis of Turbine Blades With Friction Dampers,” ASME J. Vibr. Acoust., 119, pp. 96–103.
Sanliturk,  K., and Ewins,  D. J., 1996, “Modeling Two-Dimensional Friction Contact and Its Application Using Harmonic Balance Method,” J. Sound Vib., 193(2), pp. 511–523.
Menq,  C. H., Griffin,  J. H., and Bielak,  J., 1986, “The Influence of a Variable Normal Load on the Forced Vibration of a Frictionally Damped Structure,” ASME J. Eng. Gas Turbines Power, 108, pp. 300–305.
Sanliturk, K. Y., Ewins, D. J., and Stanbridge, A. B., 1999, “Underplatform Dampers for Turbine Blades: Theoretical Modeling, Analysis and Comparison of Experimental Data,” 44th ASME Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, IN.
Menq,  C. H., Griffin,  J. H., and Bielak,  J., 1986, “The Forced Response of Shrouded Fan Stages,” ASME J. Vibr. Acoust., 108, pp. 50–55.
Menq,  C. H., Griffin,  J. H., and Bielak,  J., 1986, “The Influence of Microslip on Vibratory Response, Part I: A New Microslip Model,” J. Sound Vib., 107, pp. 279–293. 1986, “The Influence of Microslip on Vibratory Response, Part II: A Comparison With Experimental Results,” J. Sound Vib., 107, pp. 295–307.

Figures

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Receptance of the system for different interlocking values. Excitation force 80 Npk.
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Model with mass and stiffness in the measurement area
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Linear behavior of gross slip
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Ratio of tangential force and normal contact force for different frequency around resonance: evidence of friction coefficients variation
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Example of measured histeresis cycles and ellipses obtained after Fourier (1st order approx.) of force and displacement
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Stator segment contact surfaces
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Picture of a support instrumented with strain gages
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Position of the accelerometers near the contact surfaces
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Tangential contact force (determined through static and dynamic calibration)
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Hysteresis cycles in resonant condition for different interlocking values. Excitation force 80 Npk.
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Ratio of tangential force and normal contact force for different interlocking values. Support left. Resonance condition. Excitation frequency 80 Npk.
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Tangential contact force (N) (hoop direction) versus relative displacement (μm) for different interlocking and excitation values, resonance condition. Light line: right support, dark line: left support.
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Ratio of dissipated energy for friction and input energy versus frequency for different interlocking values. Excitation force 80 Npk.
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Real part of Fourier expansion of tangential force on mean normal force versus the amplitude of relative displacement on mean normal force for different interlocking values. Left support.
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Imaginary part of tangential force Fourier expansion versus the amplitude of relative displacement for different interlocking values. Left support.

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