The identification of the unbalance of a flexible rotating machine from a single rundown

A. W. Lees, J. K. Sinha, M. I. Friswell

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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 slate 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.
    Original languageEnglish
    Pages (from-to)416-421
    Number of pages5
    JournalJournal of Engineering for Gas Turbines and Power
    Volume126
    Issue number2
    DOIs
    Publication statusPublished - Apr 2004

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