Dynamic behaviors of three-dimensional rod-disk rotor rolling bearing system

Abstract

A typical rod-disk rotor is meshed by three-dimensional solid elements. The stability features, whirling motions and frequency spectrums of 3D rod-disk rotor rolling bearing system are investigated by combining nonlinear analysis method and finite element method. Meanwhile, an identical 1D rod-disk rotor system is introduced for comparison. With the support of the ball bearing, the stability region of 1D and 3D rod-disk rotors shows good consistency at lower speed and has obvious differences at higher speed. However, 3D rotor has smaller bending deformation because 3D solid elements can restrict large deflection but the equivalent springs in 1D model do not have this function. When cylindrical roller bearings are applied, both rotors also have the same frequency spectrums which consist of rotating frequency, variable compliance frequency and their linear combinations. Moreover, 3D rotor dynamics have the advantage of analyzing dynamic stress. In short, this paper proposes a numerical way to investigate the dynamic behaviors of 3D rod-disk rotor rolling bearing system.