Research on coupled vibrations between the low-to-medium speed maglev train and a long-span continuous beam bridge

This study investigates the strong coupling vibration between low-to-medium speed maglev trains and the track beam, which results from unique transmission principle of the trains. The research focuses on the impact of train parameters on the dynamic response of the car-bridge system, using a long-span continuous beam bridge as the background. Initially, a multi-body dynamics model of maglev trains was established based on the theory of maglev force equivalence as stiffness and damping. Subsequently, the solid element available in ANSYS was employed to construct a finite element model of the large-span bridge. In SIMPACK, the train-bridge coupled system was established to evaluate the dynamic response of the coupling system under various working conditions. The results indicate that the equivalent models of maglev train demonstrates excellent control performance. The vehicle parameters of weight and speed do not significantly affect the bridge vibration characteristics. However, the lateral dynamic behavior of the bridge increases significantly when the train velocity reaches 160 km/h. The operation of double-line trains in opposing directions can result in more complex bridge vibrations, with a greater dynamic response observed. Therefore, the analysis of the coupled vibration of the car-bridge system under complex operating conditions is required in the design phase. Analyzing the coupled vibration of train-bridge systems during the design phase is crucial for ensuring the safe and efficient of maglev trains.