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Technical Briefs

Modeling and Model Updating of Torsional Behavior of an Industrial Steam Turbo Generator

[+] Author and Article Information
Roberto Ricci1

Department of Mechanical Engineering, Politecnico di Milano, via La Masa 1, 20156 Milan, Italyroberto1.ricci@mail.polimi.it

Paolo Pennacchi

Department of Mechanical Engineering, Politecnico di Milano, via La Masa 1, 20156 Milan, Italy

Emanuel Pesatori, Giorgio Turozzi

Department of R&D, Franco Tosi Meccanica S.p.A., Piazza Monumento 12, Legnano, 20025 Milan, Italy

1

Corresponding author.

J. Eng. Gas Turbines Power 132(7), 074501 (Apr 16, 2010) (7 pages) doi:10.1115/1.4000287 History: Received May 06, 2009; Revised September 08, 2009; Published April 16, 2010; Online April 16, 2010

The methods employed to perform rotordynamics calculations of industrial machines are rather standard and usually allow forecasting the dynamic behavior of the considered machines. Anyhow, in some cases, in order to obtain high level of accuracy, the model has to be updated to fit experimental results, and standard modeling methods have to be improved. In this paper, the updating of the torsional model of a steam turbogenerator is presented. In order to fit the eigenfrequencies calculated using the standard model and the natural frequencies measured on-field, a modeling improvement is proposed, considering partially the dynamics of the components usually modeled as rigid disks. The proposed method has also the aim to preserve the physical meaning of the model. Finally, the new model is updated, and a very good fitting is obtained between eigenfrequencies and experimental natural frequencies.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 7

Inertia variation

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Figure 1

Strain gauge installation

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Figure 3

Standard rigid disk

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Figure 5

Eigenmode 3—the dashed box indicates the strain gauge position on the rotor

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Figure 6

Comprehensive effect of inertia and stiffness coefficients

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Figure 8

Stiffness coefficient

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Figure 10

Second eigenmode

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