Identification of nonlinear dynamic coefficients in plain journal bearings

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Identification of nonlinear dynamic coefficients in plain journal bearings

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Identification of nonlinear dynamic coefficients in plain journal bearings

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Título: Identification of nonlinear dynamic coefficients in plain journal bearings
Autor: Meruane, V.; Pascual, R.
Resumen: 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.
URI: http://www.captura.uchile.cl/handle/2250/7072
Fecha: 2008-08-02
Cita del item: TRIBOLOGY INTERNATIONAL Volume: 41 Issue: 8 Pages: 743-754 Published: AUG 2008


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