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