Identification of nonlinear dynamic coefficients in plain journal bearings

This work proposes a framework to the numerical identification of nonlinear fluid film bearing parameters from large journal orbital motion (20–60% of the bearing clearance). Nonlinear coefficients are defined by a third order Taylor expansion of bearing reaction forces and are evaluated through a l...

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Bibliographic Details
Published in:Tribology international 2008-08, Vol.41 (8), p.743-754
Main Authors: Meruane, V., Pascual, R.
Format: Article
Language:English
Subjects:
Applied sciences
Bearings, bushings, rolling bearings
Computational fluid dynamics
Drives
Exact sciences and technology
Friction, wear, lubrication
Identification
Journal bearing
Large orbital motion
Machine components
Mechanical engineering. Machine design
Nonlinear
Transient
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Summary:This work proposes a framework to the numerical identification of nonlinear fluid film bearing parameters from large journal orbital motion (20–60% of the bearing clearance). Nonlinear coefficients are defined by a third order Taylor expansion of bearing reaction forces and are evaluated through a least mean square in time domain technique. The journal response is obtained from a computational fluid dynamic (CFD) model of a plain journal bearing on high dynamic loading conditions. The model considers fluid–structure interaction between the fluid flow and the journal. The case in study considers a laboratory test rig. Results indicate that nonlinear coefficients have an important effect on stiffness and damping. It was found a change on nonlinear behavior occurred when the Oil Whirl phenomenon starts, which it is not seen in classical linear models.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2008.01.002