SIMULTANEOUS FORWARD AND BACKWARD WHIRLING IN A JEFFCOTT ROTOR SUPPORTED ON DISSIMILAR HYDRODYNAMIC BEARINGS

The equations of motion of the disk are derived using the influence coefficient method and the force balance at the journal is used to formulate the remaining governing equation. Euler Bernoulli beam theory is used to obtain the necessary influence coefficients associated with the displacement and rotation components at the disk location. Gyroscopic couples are also considered in the analysis. The solution for imbalance response is determined by solving the resulting system of linear equations numerically