To study the nonlinear dynamic characteristics of high-speed rolling bearing-rotor coupling system in maneuvering flight

the mathematical model of bearing-rub-impact rotor system with time-varying rigidity of rolling bearings in climbing-diving maneuvering flight was established by using finite element method

and the dynamic equation of the system was solved by Newmark-β integral method. The interaction between the time-varying stiffness of rolling bearings and the non-linear dynamic characteristics of rotor is considered in this model

as well as the influence of the eccentricity of rotor and the radial clearance of rolling bearings. By solving the model

the time-domain diagram

frequency-domain diagram and bifurcation diagram of the system under different states are obtained. Based on these

the time-varying characteristics of the stiffness of high-speed rolling bearings

the interaction between the stiffness of bearings and the dynamic state of rotor

the non-linear characteristics of the bearing-rotor system

the influence of the maneuvering flight state on the system and the dynamic response of rotor system with rub-impact fault in maneuvering flight are analyzed. The results show that the time-varying characteristics of bearing stiffness

which is one of the factors restricting the maximum speed of the rotor system

is closely related to the dynamic characteristics of the rotor system. Because of the maneuvering load

the complex non-linear dynamic characteristics will be generated in the rotor system

but when the speed of the system is low

the stability of the system will be improved to some extent due to the introduction of maneuvering loads. The stable motion interval decreases with the increase of rub-impact stiffness.