Control of levitation parameters and dynamic performance of maglev vehicle

The levitation performance of maglev trains is an important research direction of the maglev transportation system. To investigate the influence of control parameters on floating stability and vibration comfort during the levitation of maglev vehicles, a single-suspension rigid electromagnet model was established. Under PD control, the dynamic response characteristics and expressions of the electromagnet during levitation were obtained. The upper and lower limitations of the suspension gap feedback coefficient KP were obtained through the suspension stability condition and the vibration comfort requirement. The obtained control PD parameters were applied to the single-suspension rigid electromagnet model, the single suspension elastic electromagnet model, the single suspension elastic electromagnet-track beam model, the maglev train-track beam model. The vertical displacement and acceleration of the electromagnet or the vehicle body and the acceleration of the track beam were analyzed during levitation. The results show that the electromagnetic control parameters KP and KD regulate the stiffness and damping of the system during the floatation process, respectively. The lower limit is determined by the physical parameters of the electromagnet and the bearing mass to suppress the floatation instability, while the upper limit is determined by the acceleration limit, the initial displacement, the rated suspension gap, the physical parameters of the electromagnet and the bearing mass to ensure that the vibration comfort required by the specification is met. During levitation, the secondary suspension can reduce the acceleration of the electromagnet or the vehicle body, but increase the vibration acceleration of the maglev frame. In the case of low frequency of vehicle-rail coupling vibration, the track beam has little effect on the levitation vibration of the electromagnet or the train. © 2023, Central South University Press. All rights reserved.