Dynamics research on coupling system of medium-low speed maglev train and large span bridges based on stiffness and damping system
In order to study the dynamic response of low and medium-speed Maglev trains and multi-span bridges,this paper simplifies suspension control of Maglev as a stiffness-damping system based on the spring damping method,and establishes a multi-body dynamics model of trains.Taking a continuous girder bridge of a Maglev line under construction in China as an background,the FE model of the bridge is established with ANSYS.Then the coupling vibration of the vehicle and bridge is analyzed by importing the two independent systems into SIMPACK.The car weight in the calculation condition is set to empty,rated passenger capacity,overload,respectively and the train runs according to single and double lines.The results show that the suspension gap fluctuates within the required scope when the train is being excited,i.e.,the spring-damping method has a well-controlled effect and is suitable for coupled vibration analysis.The suspension gap fluctuations and the acceleration of the car body are inversely proportional to the vehicle weight,while the Maglev force is proportional to this parameter.Under the calculated conditions,the vertical displacements of the key sections of the bridge meet the code limits,indicating that the continuous beam bridge can ensure the safety of the Maglev train operation.In comparison with the peak vertical displacement in the main span,the train double-line condition is twice as large as the single-line condition,while the maximum value of the side span displacement is only 70％larger in the former than in the latter.This demonstrates that the train double-line condition has a greater effect on the dynamic response of the bridge.The relevant research results have certain significance for the construction of maglev lines.
maglev vehiclecontinuous girder bridgevehicle-bridge coupled vibrationdisplacement limit value
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