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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

A Study of the Nonlinear Interaction Between an Eccentric Squeeze Film Damper and an Unbalanced Flexible Rotor

[+] Author and Article Information
Philip Bonello, Michael J. Brennan

Institute of Sound and Vibration Research, University of Southampton, Highfield, Southampton SO17 1BJ, UK

Roy Holmes

School of Engineering Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK

J. Eng. Gas Turbines Power 126(4), 855-866 (Nov 24, 2004) (12 pages) doi:10.1115/1.1787503 History: Received November 22, 2002; Revised November 20, 2003; Online November 24, 2004
Copyright © 2004 by ASME
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References

Figures

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Sections through squeeze film damper
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(Reproduced from Ref. 5) Comparison of exact rotor receptance function αJU(ω) computed by the mechanical impedance method (—— ) with the approximation synthesised from four modes (– – –) (Both lines overlay)
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Convergence of RHB N=1 as the number of harmonics m is increased for XJ0/c,YJ0/c=0, −0.8 and U=5.10×10−4 kg m.m=1 ([[dotted_line]]), m=2 (⋅ - ⋅ - ⋅), m=5 (– – –); modal numerical integration (—— ).
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(reproduced from Ref. 5): Comparison of predicted and measured orbital motion at J, U, and M at 28 rev/s for XJ0/c,YJ0/c=0, −0.8 and U=5.10×10−4 kg m. RHB, N=1,m=5 (– – –), measurement over 0.5 s (—— ).
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Correlation between RHB and numerical integration predictions for amplitude at M with XJ0/c,YJ0/c=0, −0.8 and U=5.10×10−4 kg m. RHB N=1,m=5: -○- (stable), - * - (unstable); numerical integration: 𝛁. Vertical axes show ratio of half the peak-to-peak displacement to c.
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Unbalance response for XJ0/c,YJ0/c=0, −0.6 and U=2.59×10−4 kg m. All predictions are RHB N=1,m=5. Vertical axes show ratio of half peak-to-peak displacement to c.
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Unbalance response for XJ0/c,YJ0/c=0, −0.6 and U=5.10×10−4 kg m. All predictions are RHB N=1,m=5. Vertical axes show ratio of half peak-to-peak displacement to c.
Grahic Jump Location
Unbalance response for XJ0/c,YJ0/c=0, −0.8 and U=2.59×10−4 kg m. All predictions are RHB N=1,m=5. Vertical axes show ratio of half peak-to-peak displacement to c.
Grahic Jump Location
Unbalance response for XJ0/c,YJ0/c=0, −0.8 and U=5.10×10−4 kg m. All predictions are RHB N=1,m=5. Vertical axes show ratio of half peak-to-peak displacement to c.
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Variation of normalized mean y displacement (ȲJ/c) of J relative to housing center with rotational speed. All predictions are RHB N=1,m=5.

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