An adaptive control method to suppress the maglev track-induced self-excited vibration

Track induced self-excited vibration is a special problem in the EMS (electromagnetic suspension) maglev systems. In this paper, a coupled model of the steel track and the magnetic levitation system is developed, and the principle underlying the self-excited vibration is explored using the Nyquist stability criterion. To eliminate the self-excited vibration, an improved LMS cancellation algorithm with phase compensation (C-LMS algorithm) is presented. To achieve adaptive cancellation, a frequency estimator is employed to estimate the frequency of the vibration and to provide the C-LMS algorithm with a reference signal. Theoretical analysis and numerical simulation show that the proposed adaptive LMS algorithm can effectively eliminate the self-excited vibration.