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Research Papers: Gas Turbines: Structures and Dynamics

Relationship of Influence Coefficients Between Static-Couple and Multiplane Methods on Two-Plane Balancing

[+] Author and Article Information
John J. Yu

 GE Energy, 1631 Bently Parkway South, Minden, NV 89423john.yu@ge.com

J. Eng. Gas Turbines Power 131(1), 012508 (Oct 14, 2008) (11 pages) doi:10.1115/1.2968866 History: Received March 28, 2008; Revised April 16, 2008; Published October 14, 2008

This paper demonstrates analytical relationship of influence coefficients between static-couple and multiplane methods on two-plane balancing as well as its application. For the static-couple approach, cross-effects are defined between static weights and couple response as well as between couple weights and static response, thus making it possible to offset both static and couple vibration vectors effectively with appropriate combination of static and couple weights. Relationship of influence coefficients between static/couple and individual probe due to static/couple weights is also given. Static, couple, or individual probe influence coefficients due to static or couple weights can be obtained directly without having to place static or couple trial weights if influence coefficients used in the multiplane approach are known. From static and couple influence data as well as cross-effects, influence data for the multiplane approach can be obtained directly as well without having to place any trial weights at either plane. The above findings and conversion equations are obtained analytically and verified by experimental results. Conversion of influence coefficients from multiplane to static-couple format can determine whether static or couple weights are more effective as well as running vibration modes, while conversion from static-couple to multiplane format can determine which balance plane is more effective.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Diagram of vibration and weight vectors when the Keyphasor pulse occurs

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Figure 2

Diagram of static/couple vibration and weight vectors when the Keyphasor pulse occurs

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Figure 3

Rotor kit for balance calculations

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Figure 4

Polar plots and vibration vectors at 4800 rpm or so for initial run, and first and second trial runs with weight placements using Bently Nevada ADRE ® SXP software and 408 DSPi data acquisition system

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Figure 5

Synchronous orbits before and after balance at bearing Nos. 1 and 2 using Bently Nevada ADRE SXP software and 408 DSPi data acquisition system

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Figure 6

Generator rotor balance as real example

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Figure 7

Polar plots and vibration vectors at 3600 rpm before and after balance

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Figure 8

Synchronous orbits at 3600 rpm before and after balance

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