Technical Briefs

Modal Parameter Extraction of a Turboset From High Speed Balance Data

[+] Author and Article Information
Anoop K. Dhingra1

Mechanical Engineering Department, University of Wisconsin, Milwaukee, WI 53201dhingra@uwm.edu

Juan I. Hidalgo2

Mechanical Engineering Department, University of Wisconsin, Milwaukee, WI 53201


Corresponding author.


Currently Dynamic Analyst and Balance Engineer, ReGENco LLC.

J. Eng. Gas Turbines Power 130(5), 054503 (Jun 12, 2008) (5 pages) doi:10.1115/1.2938275 History: Received September 26, 2006; Revised April 05, 2008; Published June 12, 2008

Turbosets used in power generation industry are frequently placed on flexible foundations, which significantly influence the overall dynamics. Establishment of structural models that capture the rotor and foundation effects reliably using finite element modeling or modal analysis is difficult because of model complexity and/or costs involved. This paper presents a method to extract modal parameter information of a turboset using frequency response function data recorded during high speed balancing. The main advantage of the present method over the others is the low cost and small effort involved, so that it is of practical use in an industrial setting. A real life example dealing with parameter extraction for a large generator rotor is presented to demonstrate its implementation.

Copyright © 2008 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

The generator rotor being lowered into balancing pit

Grahic Jump Location
Figure 2

FE model of the generator rotor

Grahic Jump Location
Figure 3

Transfer function fitted to the FRFs of the system at Bearing 1 measurement location



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