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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

Figures

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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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Receptance of the system for different interlocking values. Excitation force 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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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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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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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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