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Influence of the External Rotor Damping on the Stability of Jeffcott Rotor in Fluid-Film Bearings

For some combinations of rotor speed and radial load, the pressure field of bearing fluid can perturb the pure rotational motion and disturbs the normal operation of a rotating machine. A classical approach to the stability analysis of Jeffcott rotor in fluid-film bearings is modelling of bearings as springer-damper elements and disregarding the external rotor damping [7] and [8]. Nonlinear models are used to verify results obtained from a linearized model. This paper deals with the influence of external rotor damping on the size of stability regions. Stability analysis of the Jeffcott rotor in fluid-film bearings is performed by using both the linear model based on the linearization of bearing force around the static equilibrium position and the nonlinear model of the velocity linearization [10].

Fluid-Film Bearing; Stability of Jeffcott Rotor; Nonlinear Model of Bearing Force; Linearization of Equations of Motion; External Rotor Damping

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