Abstract
The controlled air gap of the electromagnetic levitation system of maglev train is generally 8-10mm, which makes the vehicle/guideway coupling problem prominent. In practice, it is found that the stability of the magnetic levitation system is affected by guideway irregularities, and the levitation gaps show different dynamic characteristics, which is closely related to the sensor positions. The purpose of optimization of the dynamic performance of the electromagnetic levitation system is to reduce the dynamic deviation amplitude of the levitation gaps. Firstly, a linear model of the module levitation system with guideway is proposed. On this basis, the discrete frequency excitation method is used to obtain the dynamic amplitude response of the levitation gaps at different guideway wavelengths and vehicle speeds. Then, an optimization framework based on sensor positions is proposed. Based on this framework, the optimal sensor position at different speeds is obtained. The simulation results show that the optimal scheme can effectively reduce the deviation amplitude and the difference between the two levitation gaps, thus improving the dynamic performances of the electromagnetic levitation system.
Highlights
The maglev train uses electromagnetic force to support and to guide the vehicle to realize non-contact operation
The simulation results show that when the vehicle speed is set as 80km/h, the deviation degree of the back levitation gap can be reduced by 12.14%, and the total deviation degree of the two levitation gaps can be reduced by 4.11%
THE MODULE LEVITATION SYSTEM In Figure 2, the low-speed maglev train consists of five independent bogies, each of which is connected with the vehicle body through air springs
Summary
The maglev train uses electromagnetic force to support and to guide the vehicle to realize non-contact operation. The remainder of this paper is organized as follows: In section II, the modeling of the module levitation system with the guideway is presented, and the dynamic response of levitation gaps is investigated. THE MODULE LEVITATION SYSTEM In Figure 2, the low-speed maglev train consists of five independent bogies, each of which is connected with the vehicle body through air springs. B. THE MATHEMATICAL MODEL OF THE SIMPLIFIED MODULE LEVITATION SYSTEM Comparing to the dynamic vibration of the electromagnet, the frequency of load force from the vehicle body transmitted through the air spring is very low. Li and Chang [32] introduced the cascade control with the current control inner-loop and levitation gap control outerloop into the levitation control algorithm, which is widely used in the electromagnetic levitation control system Where kP, kI , kD, kA are the PIDA control parameters, δ0 is the set gap, and i0 is the equilibrium current
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