Jinwen Dong

Influence of Different Methods Obtaining Air-Gap Change Rate on the Stability of Electromagnetic Suspension System in Maglev

The electromagnetic suspension system is the most important subsystem in maglev. The feedback of air-gap change rate is very important for the stability of the system. Air-gap change rate can be achieved through four types, using analog differentiator with filters, analog low-noise differentiator, digital differentiator with filters and digital low-noise differentiator. In this paper, an electromagnetic suspension system is modeled and simulated by Maltab using the four methods mentioned above. Experiments are implemented using the latter three methods. According to the waveforms obtained from the simulations and experiments, the advantages and weaknesses of the different methods are pointed out. The results indicate that the digital low-noise differentiator is the most relatively economical and practical method in the electromagnetic suspension system.

Structure analysis of levitation chassis of medium-to-low speed maglev vehicles based on left-right decoupling

Levitation chassis, as an extremely important component of maglev vehicles, provides functions of transmitting levitation force and steering force, and directly affects the safety performance of the vehicle. Based on the vertical dynamics model of the levitation chassis, kinetic equations of the model are established, and a simulation program is designed to analyze the structural decoupling function of the chassis, especially under the influence of elastic constraints between the left and right modules, which are exclusively owned by maglev vehicles. A finite element model of the levitation chassis based on left-right decoupling is constructed. Analysis results of the model show that the mechanical properties of the chassis tailored for the vehicle meet the design requirements, and the stiffness and strength is adequate to bear the weight of the whole vehicle.