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TECHNICAL PAPERS

Forced Response of a Squeeze Film Damper and Identification of Force Coefficients From Large Orbital Motions

[+] Author and Article Information
Luis San Andrés

Texas A&M University

Oscar De Santiago

Dresser-Rand Co.

J. Tribol 126(2), 292-300 (Apr 19, 2004) (9 pages) doi:10.1115/1.1611503 History: Received February 12, 2003; Revised July 01, 2003; Online April 19, 2004
Copyright © 2004 by ASME
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References

Figures

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Test rig for dynamic force measurements and flow visualization in SFDs with details for sensors location on bearing housing and reference coordinate system
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(a) Test forces and bearing motions (y versus x) for circular centered orbits, (b) amplitudes of force (X,Y) versus orbit radii. Test conditions: 40 Hz, 38°C, radial clearance (hot) 122 μm.
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Identified and predicted damping (Cxx,Cyy) and inertia (Dxx,Dyy)ω coefficients for circular centered orbits. Test conditions: 38°C, radial clearance (hot) 0.122 mm, (a) 40 Hz, (b) 50 Hz, (c) 60 Hz. Predicted coefficients based on effective length (Le).
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Test forces and bearing motions (y versus x) for elliptical orbits (major amplitude along X axis). Test conditions: 40 Hz, 38°C, radial clearance (hot) 122 μm‘1
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Identified and predicted damping (Cxx,Cyy) and inertia (Dxx,Dyy)ω coefficients for elliptical motions (Fx>Fy). Test conditions: 38°C, radial clearance (hot) 0.121 mm, (a) 40 Hz, (b) 50 Hz, (c) 60 Hz. Predicted coefficients based on effective length (Le).
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Identified and predicted damping (Cxx,Cyy) and inertia (Dxx,Dyy)ω coefficients for elliptical motions (Fx>Fy). Test conditions: 54°C, radial clearance (hot) 0.102 mm, 60 Hz.
Grahic Jump Location
Identified and predicted damping (Cxx,Cyy) and inertia (Dxx,Dyy)ω coefficients for elliptical motions (Fx=Fy). Test conditions: 38°C, radial clearance (hot) 0.121 mm, (a) 40 Hz, (b) 50 Hz, (c) 60 Hz. Predicted coefficients based on effective length (Le).
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Picture depicting air ingestion (lubricant fingering) on test SFD
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Dynamic film pressures versus time at two axial locations (top and bottom). Test conditions: 54°C, 60 Hz. (x,y) forces and elliptical motion amplitudes (a,b) noted: (a) lowest amplitude, (b) moderate amplitude, and (c) largest amplitude.
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(a) Test axial flow rate (Qz) and predicted dynamic film volume change (Qd) versus amplitude of motion, and (b) Feed-squeeze flow parameter (γ) versus amplitude of motion. Three whirl frequencies.
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Predicted air volume fraction (β), effective viscosity fraction α(β) and effective length fraction l(β) versus amplitude of dynamic motion for whirl frequencies: 40, 50, and 60 Hz

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