The Influence of Same-Sign Cross-Coupled Stiffness on Rotordynamics

[+] Author and Article Information
Bugra Ertas

 GE Global Research Center, Vibrations and Dynamics Lab, Rotating Equipment Group,1 Research Circle, Niskayuna, NY 12309ertas@research.ge.com

John Vance

 Texas A & M University, Mechanical Engineering Department, Turbomachinery Laboratory, College Station, TX 77843-3123jvance@tamu.edu

J. Vib. Acoust 129(1), 24-31 (Jun 03, 2006) (8 pages) doi:10.1115/1.2346690 History: Received October 26, 2005; Revised June 03, 2006

The following paper focuses on same-sign stiffness cross coupling from several viewpoints. First, the influence on rotordynamics is analyzed and discussed, followed by a discussion of how past experiments measuring cross-coupled forces on rotating components may have been in error due to an incomplete testing procedure. Finally, experimental tests are presented on a partitioned damper seal and the correct and complete experimental procedure for determining cross-coupled coefficients is described.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Force coefficients effects on flexible rotor: (a) flexible rotor, (b) rotor geometry, (c) rotor forces, and (d) destabilizing stiffness cross coupling

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Figure 2

Same-sign stiffness cross-coupling coefficient forces: (a) −KXY and −KYX and (b) KXY and KYX

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Figure 3

Same-sign CCS components

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Figure 4

Orbit distortion from same-sign stiffness cross coupling: (a) radial distortion forces imposed on circular orbit and (b) distorted elliptical orbits

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Figure 5

Benckert and Wachter’s test rig and experimental results (4)

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Figure 6

(a) Labyrinth seal versus (b) six-bladed pocket damper seal

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Figure 7

Static pressure measurements displacement pattern: 15,200rpm

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Figure 8

Static pressure measurements

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Figure 9

Negative direct stiffness effect in diverging seals: (a) centered rotor and (b) offset rotor-limiting case



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