Frequency Response of a Rigid Rotor on Magnetorheological Fluid Squeeze Dampers

The paper presents the results of modeling the dynamic behavior of a rotor system using fluid film bearings and magnetorheological squeeze dampers. A rigid rotor model is used to describe the dynamics. A linearized bearing and damper models are used to describe force interactions in a two-mass system that takes into account the mutual motion of the damper, bearing and rotor. The hydrodynamics models of the bearing and damper are based on the Reynolds equation for the case of non-Newtonian rheological behavior of the lubricant. Dynamic coefficients were calculated for all sets of rotor speed and the applied magnetic field values. The trajectories of rotor motion were obtained on the basis of dynamic coefficients. A harmonic analysis was performed based on the rotor motion trajectories. The controllability of a magnetorheological liquid damper was analyzed based on an estimation of the maximum amplitudes of rotor vibration displacements.