The reliable estimation of a flexible foundation model and the state of unbalance (both amplitude and phase) of a turbogenerator from machine rundown measured vibration data is an active research area. Earlier studies on the estimation of both these quantities used the whole frequency range of the rundown as a single band. However, such an identification may be inaccurate for large flexible foundations having many modes in the rundown frequency range. For reliable identification, the whole frequency range has to be divided into a number of frequency bands and the frequency-dependent foundation models have to be estimated together with the unbalance. This paper combines the unbalance estimation with the split frequency range for the foundation model, and the highlights the limitations observed during estimation of foundation models and the state of unbalance. It is shown that the accuracy of the method may be enhanced by judicious choice of a weighting function. Having established the method in simulation, experimental data from a 3-m long test rig, with four journal bearings, is used to test the method. The approach seems to give reliable estimates of the machine unbalance.
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April 2004
Technical Papers
The Identification of the Unbalance of a Flexible Rotating Machine From a Single Rundown
A. W. Lees,
A. W. Lees
Department of Mechanical Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
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J. K. Sinha,
J. K. Sinha
Department of Mechanical Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
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M. I. Friswell
M. I. Friswell
Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, UK
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A. W. Lees
Department of Mechanical Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
J. K. Sinha
Department of Mechanical Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
M. I. Friswell
Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, UK
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Amsterdam, The Netherlands, June 3–6, 2002; Paper No. 2002-GT-30420. Manuscript received by IGTI, Dec. 2001, final revision, Mar. 2002. Associate Editor: E. Benvenuti.
J. Eng. Gas Turbines Power. Apr 2004, 126(2): 416-421 (6 pages)
Published Online: June 7, 2004
Article history
Received:
December 1, 2001
Revised:
March 1, 2002
Online:
June 7, 2004
Citation
Lees , A. W., Sinha, J. K., and Friswell, M. I. (June 7, 2004). "The Identification of the Unbalance of a Flexible Rotating Machine From a Single Rundown ." ASME. J. Eng. Gas Turbines Power. April 2004; 126(2): 416–421. https://doi.org/10.1115/1.1691441
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