Characteristics of vibration in magnetically levitated trains subjected to crosswind

Abstract

An electromagnetic suspension system-type (EMS-type) magnetically levitated vehicle (Maglev) maintains the airgap between the guiderail and the electromagnet by controlling the electric current through the levitation controller and runs with the help of a linear induction motor. ECOBEE, an EMS-type Maglev, is designed for the purpose of urban transit and must run on a curved guideway with a small radius of curvature. However, while the EMS-type Maglev controls the vertical airgap using the levitation force of the electromagnet, in the case of the lateral direction, a guidance force, which is determined by the levitation force through the intensity of lateral displacement, passively controls the lateral displacement. However, when an excessive lateral displacement is triggered by a disturbance that is greater than the guidance force, an antiaberration skid comes into contact with the rail. Therefore, the Maglev running on a curve with a small radius should maintain the airgap without touching the rail when turning directions on a curved rail, while the vibrations of the vehicle caused by external factors, such as entering the circular curve from the transition curve, or a crosswind, can affect the levitation stability. Therefore, in order to secure the levitation stability of the electromagnet while also improving the curving performance of the vehicle, inserting a lateral damper between the cabin and the bogie has been suggested. In the present study, by using an integrated model of the Maglev system developed by multibody dynamics, the influence of a crosswind as the train runs along a curve and the effect of the lateral damper were analyzed.

Research on nonlinear modeling and dynamic characteristics of lateral stiffness of vehicle air spring system

“…The influence of crosswind on the dynamics of rail vehicles has been considered in previous studies. In this article, the focus is on the lateral aerodynamic force of crosswind acting on the vehicle car-body, the lateral aerodynamic force F c can be described as follows [16][17][18]…”

“…The influence of crosswind on the dynamics of rail vehicles has been considered in previous studies. In this article, the focus is on the lateral aerodynamic force of crosswind acting on the vehicle car-body, the lateral aerodynamic force Fc can be described as follows 16–18 where ρ is the air density, ρ=1.2258 kg/m3, S is the cross-sectional contact area of car-body, μ and ν are the velocity of crosswind and vehicle, and β is the attack angle.…”

Study on the Dynamics Characteristics of HTS Maglev Train Considering the Aerodynamic Loads under Crosswinds

“…The numerical simulation method has become a mainstream approach in the aerodynamic assessment of high-speed trains when faced with crosswinds [23,24]. However, current research [25,26] primarily addresses the influence of strong crosswinds on conventional wheel-rail trains, with maglev trains being somewhat overlooked in this area of research. Additionally, the current research focuses on mediumand low-speed maglev systems.…”

Safety analysis of high temperature superconducting maglev train considering the aerodynamic loads under crosswinds

“…Currently, lots of scholars mainly focused on wheel-rail trains subjected to crosswinds, while few about maglev trains. [17][18][19] Meng et al 17 studied the influence of the levitation gap on the lift of maglev trains in crosswind by combining numerical simulation method and wind tunnel test. Han and Kim 18 analyzed the influence of crosswind as the train runs along a curve by using an integrated model of the electromagnetic suspension (EMS) system developed by multibody dynamics.…”

“…[17][18][19] Meng et al 17 studied the influence of the levitation gap on the lift of maglev trains in crosswind by combining numerical simulation method and wind tunnel test. Han and Kim 18 analyzed the influence of crosswind as the train runs along a curve by using an integrated model of the electromagnetic suspension (EMS) system developed by multibody dynamics. And the published articles take EMS as the research object.…”