Study on dynamical characteristics of misalign-rubbing coupling fault dual-disk rotor-bearing system

For the misalign-rubbing coupling fault rotor-bearing system caused by misaligned bearing, the mechanical model and finite element model of dual-disk misalign-rubbing coupling fault rotor-bearing system were established in this paper. The research on dynamics characteristics about the effect of rubbing stiffness, misaligned angle, friction coefficient, rubbing interval and rotational speed on the system was done with the equivalent misaligned moment, nonlinear finite element method and contact theory. Through the relevant research and analysis, it was found that misalign-rubbing coupling fault mainly embodied in the rubbing fault. It was also found that frequency-doubled appeared very early and its peak increased rapidly. This feature can be as a basis which can diagnose misalign-rubbing coupling fault.