Numerical Analysis Of Motor Car-simply Supported Girder Bridge Coupled Vibration Response

Vehicle-bridge coupling vibration is an important issue to consider when you design a bridge or a vehicle.When the trains driving on the bridge,because of trains' own gravity and speed,it will apply a dynamic impact to the bridge which makes the bridge deformed and stressed,while deformed bridge apply a dynamic impact to the vehicle back,which formed the vehicle-bridge coupling vibration problem.The velocity,acceleration,damping of the train,track irregularity and natural phenomena such as drift ice,wind and earthquake will make a difference to vehicle-bridge coupling vibration,that is,those factors will make a difference to the safety and stability of the vehicle.As a result,it is necessary to study the response of the train-bridge system under various conditions to develop the railway bridge.The numerical simulation of the finite element software named ANSYS Workbench is used in this paper to establish the vehicle-bridge coupling system.The transient analysis module of system to do dynamic response analysis is used.This article main research contents include that:(1)Regard the connection of the wheel and rail as Hertz contact.Set up vehicle and bridge model respectively,then link vehicle and bridge as a whole through the connection of the vehicle and the track in bridge.(2)Transform the track irregularity spectrum with inverse Fourier transform from frequency domain into the time domain and load it into the vehicle-bridge coupling vibration system to form a new vehicle-bridge coupling system.(3)Simplify the impact of drift ice to impact loading form,by reading the related documentations,confirm the parameters and the formula of ice force.(4)Change the value of velocity,acceleration,the damping of shock absorber,and the condition whether on track irregularity or drift ice,simulate the impact of these parameters on the vehicle-bridge system.Analyze the response of the system.(5)Results indicate that the velocity?acceleration and damping of the vehicle,track irregularity and drift ice impact on the influence of the train-bridge system are existed.In terms of concrete influence size,axle biggest influence track irregularity,the impact of the velocity are least.Ice impact axle system is limited,but it will have great influence on transverse vibration,which will do harm to the train operation safety and stability,so it is needed to convection phenomena ice prevention.The position where the vehicle on the bridge will effect the vehicle bridge coupling vibration.When the drift ice appeared in running in the middle and after the process,the vehicle-bridge coupling vibration is largest.