Research on Coupled Vibration Mechanism of Vehicle-Rail System Considering the Effect of Track Elasticity on Time Delay

Abstract

In recent years, many achievements have been made in the research of EMS magnetic levitation control system. However, from the point of view of practical engineering application, these studies still have the following problems and shortcomings: 1) At present, the practical linear control strategy lacks on-line adjustment of control parameters. 2) The existing control methods can not suppress the influence of unknown disturbance by active online identification. 3) Most of them neglect unidirectional control and actuator saturation. 4) Most existing tracking control methods are sensitive to the uncertainties of model parameters. 5) When designing and analyzing the controller, the influence of multi-parameter perturbation and external disturbance cannot be considered. 6) There are still some deficiencies in the mechanism of the time-delay effect on the coupled dynamic response of vehicle-rail system. In this paper, the EMS maglev control system of low-speed maglev train is taken as the research object, focusing on the shortcomings of the existing research, and aiming at the problems of coupled vibration of Maglev train, the high-performance maglev control and coupled dynamic response of maglev train are studied in depth. A method for solving Hopf bifurcation point of magnetic levitation system based on Routh criterion is proposed, which solves the huge calculation problem that the traditional method needs to solve all eigenvalues with each parameter change. The interaction and constraints of time-delay parameters on Hopf bifurcation are comprehensively analyzed. Finally, the correctness of the theory and simulation is verified by experiments, which provides a theoretical basis for suppressing the vehicle-rail coupling vibration in the future