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Vibration Sensitivity of Large Turbine Generator Shaft Trains to Unbalance Read chapter Read first chapter

2015 | OriginalPaper | Chapter

Stability Analysis and Assessment of Rotor Trains Using Operational Modal Analysis

Authors : Eoin Peter Carden, Niklas Sehlstedt, Kenny Krogh Nielsen, Staffan Lundholm, Stefano Morosi

Published in: Proceedings of the 9th IFToMM International Conference on Rotor Dynamics

Publisher: Springer International Publishing

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Abstract

Stability of lateral rotordynamic modes is an essential consideration during design and acceptance testing of rotating machinery. Experimental modal analysis (EMA) can be used for assessment but is in practice very difficult in actual operating conditions, principally due to the challenges of quantifying the excitation force. Operational modal analysis (OMA) does not require measurement of excitation forces and therefore presents significant logistical advantages over EMA. The background and theoretical concepts of OMA are presented and its use is demonstrated on a 500 kW centrifugal compressor. Measurements performed during commissioning at first raised suspicion that the stability was marginal. However OMA was used to confirm that the first forward mode of the compressor was actually stable and the measurements were reconciled with the predicted behavior. The results show that the assessment of stability margins of rotating machinery can be measured with OMA using only proximity probe data acquired during normal operation.

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previous chapter Numerical Analysis on the Nonlinear Hysteresis Phenomenon Associated with Instability of a Steam Turbine Rotor-Bearing System
next chapter Stability Analysis Based on Energy Balance of Motion of the Gyroscopic Exercise Tool
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Metadata
Title
Stability Analysis and Assessment of Rotor Trains Using Operational Modal Analysis
Authors
Eoin Peter Carden
Niklas Sehlstedt
Kenny Krogh Nielsen
Staffan Lundholm
Stefano Morosi
Copyright Year
2015
Book
Proceedings of the 9th IFToMM International Conference on Rotor Dynamics

Print ISBN: 978-3-319-06589-2

Electronic ISBN: 978-3-319-06590-8

Copyright Year: 2015

DOI
https://doi.org/10.1007/978-3-319-06590-8_172

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