As a key device of inertial navigation system, gyroscope is widely used in satellite and other space craft. The performance of gyroscope largely depends on the performance of gyroscope rotor system. It is necessary to research nonlinear dynamic characteristics of gyroscope rotor system to improve the performance of satellite gyroscope. In this paper, a nonlinear dynamic model of rolling element bearing rotor system is presented and nonlinear dynamic characteristics and stability of gyroscope rotor system is...