MOTION OF ROTOR SUPPORTED ON AERODYNAMIC BEARINGS

Abstract eng:
The tilting pad bearings are very often applied in high speed rotating machines. The exact solution of bearing characteristics, including the motion of tilting pads, is very difficult and not yet completely elaborated. An approximate method for calculation of rigid rotor motion with large amplitudes limited only by the bearing clearance is presented. The models of stiffness and damping forces valid for the entire area of journal motion in the aerodynamic bearing's clearance are based on the transformation of linear stiffness and damping characteristics calculated for two cases of stationary state and extended to the whole bearing field by using the correction function fcor(r). Differential equation of motion of rotor modeled by a mass point supported on aerodynamic bearing with proposed nonlinear characteristic is numerically solved and resulting time histories of journal motion and its plane trajectories are presented. The influence of eccentricity of rotor on its dynamic response are analysed as well.

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