Abstract: Aiming at the problem that base excitation would cause the rotor to collide to protect the bearing and even cause the system to lose stability, the vibration displacement response characteristics and control of the active magnetic bearing-flexible rotor system under the condition of base translational excitation were studied. First, the motion equation of the active magnetic bearing-flexible rotor system in the base coordinate system was established. Then, an adaptive controller was designed with the base acceleration as the input signal and the LMS variable step algorithm, the output signal was adaptively adjusted according to the displacement difference, and the vibration displacement response of the system under this kind of disturbance was suppressed. A numerical simulation was carried out to analyze the vibration displacement response characteristics of the rotor system under the base translational excitation, and the control effect of the designed adaptive controller to control the vibration of the active magnetic bearing-flexible rotor system under the base translational excitation condition was studied. The results show that the vibration displacement response of the electromagnetic bearing-flexible rotor system under base translational excitation is related to the excitation frequency, excitation amplitude, excitation phase, etc. The adaptive controller proposed in this paper can effectively suppress the vibration of the active magnetic bearingflexible rotor system under the base translational excitation.

Key words:  flexible rotor; active magnetic bearing; base translational excitation; LMS algorithm; vibration control