Pivot Stiffness Effect on Transient Dynamic Characteristic of Tilting Pad Journal Bearing-Rotor System Passing through Critical Speed

Tilting pad journal bearings (TPJBs) are widely applied in the high-speed rotor system whose working speed is higher than its critical due to excellent hydrodynamic lubrication and stability. Pivot stiffness one of key design parameters TPJBs compared other has become particularly important for optimizing performance TPJB-rotor systems. In order improve vibration characteristics systems, transient dynamic characteristic a passing through investigated considering different pivot ratios. A time-varying dynamics model symmetrical single-disc supported by four-pad established constant acceleration conditions nonlinear bearing force. The disc characteristic, force analyzed using Bode plot, shaft center orbit, phase waterfall time history. results show that plays major role suppression resonance amplitude system, without changing frequency system. This study provides theoretical basis