Dynamic response analysis of bearing-rotor system considering cage whirling motion

Dynamic model of bearing-rotor system is developed considering the collision effects between cage and its guiding land. The modal characteristic vibration response are studied with fourth-order Runge-Kutta method. It demonstrated that whirling motion arising as a result land would induce abnormal frequency components in system’s including multiple well modulation speed natural frequency. Additionally, rotor become severe when rotates around pitching-mode critical speed. shown amplitudes frequencies can be decreased by reducing unbalance given range.