Application of VMD in Fault Diagnosis for Rotor-Bearing System with Rub-Impact

In order to effectively diagnose the rub-impact fault of rotor-bearing system, this study develops an experimental model of a two-span rotor-bearing system with rubbing faults. The rubbing experiment was carried out through the experimental platform and its analysis system, and the vibration of the rotor bearing system running under normal conditions, local slight rubbing and severe rubbing throughout the cycle are observed. The Variational Mode Decomposition (VMD) is then applied to the fault data analysis experiments of different rubbing degrees of the rotor. The experimental results further verified the effectiveness of the method, which can reveal the frequency structure of rubbing faults and accurately reflect the fault information. The findings are helpful in further understanding the dynamic characteristics of the rub-impact fault of the two-span rotor-bearing system and provide reference for fault diagnosis.