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-to-stator 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 super-synchronous vibrations in rotating machines.

Analysis of the sensitivity to non-linear effects in the oil-film forces of 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-to-stator 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 super-synchronous vibrations in rotating machines.
Institution of Mechanical Engineers - 10th International Conference on Vibrations in Rotating Machinery
9780857094520
non-linear effects; journal bearing; oil-film forces; parametric analysis
File in questo prodotto:
File Dimensione Formato  
VIRM10 - Analysis of the sensitivity to non-linear effects in the oil-film forces of journal bearings.pdf

Accesso riservato

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 472.14 kB
Formato Adobe PDF
472.14 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/678356
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? ND
social impact