Often, the presence of unexpected super-synchronous harmonic components in the vibrations of rotating machines is considered a reliable symptom of serious faults like: shaft cracks, rotor-tostator rubs and severe misalignments. However, the not unusual occurrence of malfunctions that cause high synchronous vibration levels can generate non-linear forces in oil-film journal bearings, which, in turn, give rise to unexpected super-synchronous vibrations of the shaft. The knowledge of the sensitivity to non-linear phenomena in oil-film journal bearings can give significant information that allows the identification of false faults to be avoided. This paper shows the results provided by a model-based method focused on the investigation of the influence of the synchronous vibration level on the generation of non-linear effects in the behaviour of oil-film journal bearings and supersynchronous vibrations in rotating machines.

On the non-linear effects in journal bearings

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

Abstract

Often, the presence of unexpected super-synchronous harmonic components in the vibrations of rotating machines is considered a reliable symptom of serious faults like: shaft cracks, rotor-tostator rubs and severe misalignments. However, the not unusual occurrence of malfunctions that cause high synchronous vibration levels can generate non-linear forces in oil-film journal bearings, which, in turn, give rise to unexpected super-synchronous vibrations of the shaft. The knowledge of the sensitivity to non-linear phenomena in oil-film journal bearings can give significant information that allows the identification of false faults to be avoided. This paper shows the results provided by a model-based method focused on the investigation of the influence of the synchronous vibration level on the generation of non-linear effects in the behaviour of oil-film journal bearings and supersynchronous vibrations in rotating machines.
2012
Atti 3° Workshop AIT
8890191686
non-linear effects; oil-film journal bearings
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/646132
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