Abstract
In this paper, the influence of base excitation on the rotor-rolling bearings’ supports with rubber damping rings coupling dynamics model was studied. Using the finite-element theory associated with the lumped mass method, the governing differential equations of the coupling system were established. In this model, the rotor was discretized using Timoshenko beam elements, while the supports and ball bearing outer races were modelled as lumped parameter models. The dynamic model was verified by varying compliance (VC) vibration impact analysis, the influence of the rubber damping ring, and the rotor unbalanced response. On this basis, the effect of the dynamic characteristics of the rotor coupling system subjected to base vibration was analysed. The base excitation frequency near the natural frequency of the rotor not only exerts an effect on the rotor vibration in the direction of excitation but also the rotor oscillation in the other directions. The amplitude of the axial trajectory is influenced by the frequencies and amplitudes of the foundation excitation. As the amplitudes of the base excitation increase, the amplitude of the axis trajectory tends to increase linearly, and the speed of growth is different at various base excitation frequencies. The shape of the axial trajectory is mainly affected by the foundation excitation frequencies. As the excitation frequency changes, the axis trajectory becomes complicated, and the combination resonance phenomenon occurs.
Published Version
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