Researth On Load Disturbance Of Levitation System Running Across Vertical Curve

Due to the geometric constraints and dynamic constraints between the train and track, the electromagnet will meet several load disturbances when maglev train is running across the vertical curve. Experiments show that when the train runs across a vertical curve with a certain speed, the carriage will vibrate severely. It's named'nodding phenomenon'. This will influence the performance of levitation system, even make the system unstable. Aiming at improving the anti-jamming capability of levitation system, this paper analyzes the source and character of load disturbance when the train runs across the vertical curve, and optimizes the feedback parameter on condition of levitation controller output saturation based on engineering practice. The main content of this paper can be summarized as following.Firstly, a two-point levitation model is built, considering electro magnetic module as investigated subject. And the simulation model adopts state feedback control method, by analyzing the stability and controllability of levitation system. And the model is simulated in the case of the maglev train running on smooth guideway.Secondly, the geometry relation and dynamics confinement are analyzed, aiming at the running phenomenon of the train crossing the vertical curve. The relational expression of disturbance force is given by analyzing dynamics confinement among radius of vertical curve, train running speed and the disturbance.Thirdly, considering existing control algorithm, the feedback signals are analyzed and new signal combinations is presented, the simulation results show that the new algorithm proves feasible and effective to reject the disturbances.Finally, based on the engineering practice, the relationship is analyzed between levitation controller input saturation and system stability. A method is given to optimizes the feedback parameter considering controller saturation. The simulation results show that the system could levitate stably using optimized parameter as the same disturbance force appears, comparing to original parameter.In a word, the simulation results in this paper are consistent with the test phenomenon when the train runs across the vertical curve. The new algorithm is helpful to engineering practice and need to be verified in practice.