Research On The Dynamic Response Of High-speed Magnetic Levitation Vehicle-bridge Couplin

With the successful development of 600km/h high-speed maglev train in China.The domestic engineering application of high-speed maglev transport system has been put on the agenda.Although the high-speed maglev train has been applied in engineering,there is no high-speed maglev line to match it.The in-depth study of the high-speed maglev vehicletrack coupling dynamic response and the exploration of the technical parameters of the high-speed maglev line and the vehicle-track coupling dynamic response law can provide theoretical and technical support for the safe and stable running of the high-speed maglev.Based on the theory of multi-body dynamics,the dynamic model of high-speed maglev vehicle-track coupling is established by the UM.Firstly,the elastic property parameters of simply supported beams and continuous beams with different spans are studied.It is obtained the elastic property parameters of simply supported beams with five spans of 25 m,35m,45 m,55m,65 m and continuous beams with five spans of 25 m,50m,75 m,100m,125 m.Then,based on the above parameters,the effects of air spring stiffness,track beam damping ratio,track beam spans and Maglev train speed on the dynamic response of maglev vehicle-track coupling are studied.The results show that the vertical acceleration amplitude of maglev vehicle body increases with the increase of air spring stiffness.The vertical acceleration amplitude of the track beam decreases with the increase of the damping ratio of the track beam.The vertical acceleration amplitude of the car body and the vertical displacement amplitude of the track beam span increase with the increase of the track beam span.When the span of the track beam is 25 m,35 m and 45 m,the vertical acceleration amplitude in the middle of the track beam decreases with the increase of the span of the track beam.When the span of the track beam is 45 m,55 m and 65 m,it increases with the increase of the span of the track beam.The vertical acceleration amplitude of the car body and the vertical acceleration amplitude of the middle span of the track beam increase with the increase of the train speed.The vertical displacement amplitude of the middle span of the small span track beam decreases with the increase of the train speed,and the vertical displacement amplitude of the middle span of the large span track beam increases with the increase of the train speed.Finally,the dynamic response law of maglev vehicle-track coupling with the change of plane curve cross-slope angle and vertical curve slope is studied.The research shows that the vertical acceleration of maglev vehicle increases with the increase of plane curve cross-slope angle.The lateral acceleration of maglev vehicle decreases with the increase of plane curve cross-slope angle.When the vertical curve slope is less than 50 ‰,the dynamic response of the maglev vehicle-track coupling is within the standard limit range,and the train running is stable.Based on the law of vehicle-track coupling dynamic response of plane curve,satisfying the condition of the stable running of high-speed maglev train,the minimum radius and cross-slope angle of maglev plane curve under four speed levels of 300km/h,350km/h,400km/h and 450km/h are studied.The minimum radius and cross-slope angle of four high-speed maglev plane curve lines are recommended.