转子弹性支承螺栓松动致干摩擦故障分析

Abnormal vibration of a core engine rotor system was observed in the experimental results under different working conditions. A simplified rotor model with looseness in its front squirrel cage supporting was established based on the experimental results. Based on the rotor dynamic theory and the experimental signal characteristics, the bolt looseness of the front squirrel cage supporting was modeled by a generalized Dahl friction model following Masing rules. The orbit of shaft center, displacement of front supporting and supporting anti-force were carefully analyzed for the following three types: linear rotor system without fault; nonlinear rotor system with bolt looseness but without gyroscopic effect; nonlinear rotor system with bold looseness and gyroscopic effect. The simulation results showed that, in a rotor system with dry friction, the response of the system had rich harmonic components; the gyroscopic effect showed important influence on the harmonic components in the dynamic responses. The research results provide a reference for the monitoring and diagnosis of this type of faulty rotor system.