Dynamics modeling and analysis for tilting-pad fluid film bearing considering perturbation frequency

Swing of pads on the tilting pad bearing increases the DOF of the system. Pads and journal perturbation frequency has a great influence on calculating the tilting pad bearing dynamic coefficients. The currently research, the effect of the shaft and pads perturbation frequency generally were not considered on dynamic coefficients of tilting pad bearings. Frequency reduced dynamical model of the tilting pad bearings was presented considering the effects of the perturbation frequency, and frequency reduced oil film dynamic coefficients matrix was investigated in detail. The FEM method was used to solve oil film dynamic coefficients with considering perturbation frequency for the tilting pad bearing. The numerical results indicate that the direct stiffness coefficients reduce, while the direct damping coefficients enhance, and the cross coupling stiffness and damping coefficients change little with increasing perturbation frequency.