In general, abnormal changes of the twice per revolution harmonic component of the shaft vibration are considered the most important symptom of a crack propagation in horizontal shafts of rotating machines. This paper shows the results of a model-based investigation performed to study the influence of some basic geometrical characteristics of full-annular cracks on the shaft dynamic behaviour. This study has shown that, contrary to common cracks, full annular cracks may cause only minor changes of the shaft super-synchronous vibrations. These results are in good accordance with the experimental dynamic behaviour experienced by a steam turbine in which a very deep annular crack propagated.

On the effects of transverse annular cracks in rotating machines

VANIA, ANDREA TOMMASO;PENNACCHI, PAOLO EMILIO LINO MARIA;CHATTERTON, STEVEN
2012-01-01

Abstract

In general, abnormal changes of the twice per revolution harmonic component of the shaft vibration are considered the most important symptom of a crack propagation in horizontal shafts of rotating machines. This paper shows the results of a model-based investigation performed to study the influence of some basic geometrical characteristics of full-annular cracks on the shaft dynamic behaviour. This study has shown that, contrary to common cracks, full annular cracks may cause only minor changes of the shaft super-synchronous vibrations. These results are in good accordance with the experimental dynamic behaviour experienced by a steam turbine in which a very deep annular crack propagated.
2012
Institution of Mechanical Engineers - 10th International Conference on Vibrations in Rotating Machinery
9780857094520
Rotating machine; annular crack; breathing phenomenon; parametric analysis
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/678355
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