Estimating unbalance and misalignment of a flexible rotating machine from a single run-down

JK Sinha, AW Lees, MI Friswell

Research output: Contribution to journalArticle (Academic Journal)peer-review

93 Citations (Scopus)

Abstract

Earlier studies have suggested that the reliable estimation of the state of unbalance (both amplitude and phase) at multiple planes of a flexibly supported rotating machine from measured vibration data is possible using a single machine run-down. This paper proposes a method that can reliably estimate both the rotor unbalance and misalignment from a single machine run-down. This identification assumes that the source of misalignment is at the couplings of the multi-rotor system, and that this will generate constant synchronous forces and moments at the couplings depending upon the extent of the off-set between the two rotors, irrespective of the machine rotating speed. A flexible foundation model is also estimated. The method is demonstrated using experimental data from a machine with two bearings and a flexible coupling to the motor. A sensitivity analysis has also been carried out for the proposed approach with perturbation errors in the rotor and bearing models, to confirm the robustness of the method.
Translated title of the contributionEstimating unbalance and misalignment of a flexible rotating machine from a single run-down
Original languageEnglish
Pages (from-to)967 - 989
Number of pages23
JournalJournal of Sound and Vibration
Volume272(3-5)
DOIs
Publication statusPublished - May 2004

Bibliographical note

Publisher: Elsevier

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