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Balancing with the presence of a rub

Published online by Cambridge University Press:  04 November 2011

Nicolas Péton
Nicolas Péton*
Affiliation:
GE Energy Measurement and Control Solutions, 2 rue de Flandre, 44240 La Chapelle sur Erdre, France
*
aCorresponding author: [email protected]
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Abstract

During commissioning of a cogeneration plant the air cooled generator cannot be run up tosynchronization speed because of high 1X vibration during startup. Several attempts weredone by the commissioning team to balance the rotor but proven ineffective. This paperpresents the vibration analysis performed by GE MDS Engineer. As a result of the analysisit was concluded the high levels of synchronous vibration are caused by thermally inducedbow because of rub in the new type of seals installed in generator casing. The seals wereremoved for test and the generator was started successfully. The next part of the paperdiscusses the differences between Newkirk and Morton type thermally induced bows as theycan be observed in the machinery diagnostics during field analysis.

Keywords

Rubbingbalancingrolling phasethermal phenomenonNewkirkMorton effect
Type
Research Article
Information
Mechanics & Industry , Volume 12 , Issue 5 , 2011 , pp. 409 - 418
Copyright
© AFM, EDP Sciences 2011

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References

D.E. Bently, C.H. Hatch, Fundamental of rotating machinery diagnostics, bently pressurized bearing company, 2002
J. Schmied, J. Pozivil, J. Walch, Hot spots in turboexpander bearings: case history, stability analysis, measurements and operational experience, Proc. ASME Turbo Expo 2008: Power for Land, Sea and Air, June 9–13, 2008, Berlin, Germany
L. Eckert, J. Schmied, A. Ziegler, Case history and analysis of the spiral vibration of a large turbogenerator using three different heat input models, ALSTOM & DELTA JS AG, 7th IFToMM Conference on Rotordynamics, Vienna, Austria
De Jongh, F.M., Morton, P.G., The synchronous instability of a compressor rotor due to bearing journal differential heating, J. Eng. Gas Turbines and Power 118 (1996) 816–823 CrossRefGoogle Scholar
B.L. Newkirk, Shaft rubbing. relative freedom of rotor shafts from sensitiveness to rubbing contact when running above their critical speeds, Mech. Eng. 48 (1926)
H.D. Taylor, Rubbing shafts above and below the resonance speed (Critical Speed), General Electric Company, R-16709, Schenectady N.Y., 1924