600 km/h磁浮大跨度连续梁车-桥耦合振动特性及影响因素研究OA

For the 600 km/h high-speed maglev(HSM)system,the vehicle-bridge coupled vibration character-istics of a long-span continuous bridge and its impact on vehicle operation safety are studied.A coupled model of the HSM train and continuous bridge is established through finite element and multibody dynamics simula-tions.The vehicle-bridge coupling vibration characteristics of three types of long-span bridges under varying section height,stiffness,guideway configuration,and train speed are investigated.The results indicate that the bridge span and section height significantly affect the train's vertical acceleration,bridge vibration re-sponse,and vehicle-bridge coupling effects.As the bridge span increases and the section height decreases,the natural frequency drops,and both the train's vertical acceleration and bridge vibrations increase substantially.Especially under high-speed conditions,long-period excitation may cause vertical resonance of the vehicle body.On the other hand,the stiffness of the guideway also has a significant impact on the overall stiffness of the bridge.Compared with point-supported guideways,continuous guideways help reduce dynamic responses of HSM train.To avoid resonance,it is crucial to control the impact of stiffness on the train's dynamic re-sponse when designing large-span bridges,with attention to the vertical natural frequency design and the avoid-ance of resonance between the excitation frequency and the train's resonance frequency.The research results can provide a theoretical basis for the design and operation of high-speed maglev long-span bridges.