Exploring Rubbing Nonlinear Characteristics of Rotor-Casing Coupling System
The problem of rotor-casing rubbing is one of the most common faults in aviation engines.Near the critical speed,the amplitude of the rotor vibration increases sharply,and it causes rubbing if it exceeds the initial gap between rotor and casing.In order into further explore the mechanism of rubbing,the nonlinear rubbing force model considering damping is established and coupled to the rotor-casing system.The fourth-order Runge-Kutta solution is used to study the vibration response of the rotor-casing system,and the response bifurcation diagrams of the rotor-casing system at different speeds are given respectively,and the motion forms of the rotor and casing during rub-impact are analyzed.Synchronizely,the effects of collision recovery coefficient and rubbing gap on rotor motion and rubbing force are discussed.The results show that the decrease of collision recovery coefficient leads to the increase of rotor-casing embedding depth,which leads to the increase of rubbing force.The rubbing gap changes the frequency of rubbing,and with the decrease of the gap,the frequency of rubbing increases.
rotorrubbingnonlinearitybifurcationcoupling system
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