Investigation of Vibration Energy and Transfer State in a High-Speed Rotor System with Crack Fault

This is the authors' abstract. We don't add key points for this paper.

The rotor system operating under harsh conditions, such as high rotation speed, long-term operation, and alternating load, is susceptible to crack faults that pose a threat to operational stability. The abnormal vibration of the rotor caused by crack faults represents an anomalous transfer of energy from the force-driving point through the shaft. Relying solely on rotor vibration displacement for analysis may not provide a comprehensive reflection of the internal impact of cracks on system operation. Thus, the vibration power flow is utilized to investigate a cantilever support rotor, commonly employed in high-speed rotor systems for aeroengines, under the influence of crack faults. The results reveal the reason for the distinctive motion observed at twice the first critical speed in the cracked rotor. The vibration energy of the system is investigated through nonlinear dynamics analysis in the presence of displacement bifurcation. Subsequently, the energy response and transfer of cracked rotor systems under parameter influence are examined to elucidate how crack faults impact the input and transfer of vibration energy. The accuracy of theoretical findings is validated through experimental methods. These research findings are valuable for dynamic characteristic analysis and fault diagnosis in cracked rotor systems.