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Non Linear Behaviour of Oil Film Bearings and its Relevance in Force Identification Procedures FREE

[+] Author Affiliations
Nicolò Bachschmid, Riccardo Dellupi

Politecnico di Milano, Milano, Italy

Paper No. 97-GT-070, pp. V004T14A013; 6 pages
doi:10.1115/97-GT-070
From:
  • ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award
  • Orlando, Florida, USA, June 2–5, 1997
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7871-2
  • Copyright © 1997 by ASME

abstract

The main differences in the calculated behaviour of an unbalanced rotor on two-lobe oil film bearings, in terms of mean statical position, 1 × rev. and 2 × rev. components in steady-state conditions, between the results obtained by means of the linearized and the non linear oil film models are shown.

The errors introduced by the linearized model are not negligible and can affect significantly the accuracy of results of numerical simulations. This may be unacceptable if one uses the measured vibrations in the bearings for identifying the exciting forces on the rotor in a model based diagnostic approach.

Therefore a method is presented which utilises the linear model of the rotor and the non linear oil-film forces in the identification procedure.

Copyright © 1997 by ASME
Topics: Bearings
This article is only available in the PDF format.

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