Research On Reliability Of Train Operation On High Speed Railway Bridge Under Random Wind

Vigorously building high-speed railways has become the development trend of rail transit.With the increase in the speed of high-speed trains,the problems it causes are also getting more and more attention.The crosswind effect has a great impact on the safe operation of high-speed trains.This paper summarizes the research progress on aerodynamic characteristics and driving safety of high-speed trains at home and abroad.The joint simulation method of ANSYS and SIMPACK is used to analyze 'the safety and reliability of train operation,including the following aspects:(1)Based on the theory of fluid dynamics,a three-dimensional model of the train-bridge combination is established,and the aerodynamic coefficient of the high-speed train is numerically analyzed.The aerodynamic coefficient of the high-speed train under the cross wind is obtained.The turbulence model used in the simulation.Considering the influence of wind deflection angle,the variation law of the aerodynamic coefficient of the train on the bridge with the wind deflection angle is calculated.(2)Based on ANSYS finite element software and SIMPACK multi-body dynamics software,joint simulation of flexible body track-bridge and rigid vehicle.Model the track-bridge in the ANSYS finite element software,import the flexible track-bridge model into SIMPACK,and combine it with the high-speed train model to form the vehicle-rail-bridge coupling vibration analysis model,and use the track irregularity as the excitation to obtain high speed The safety evaluation index of the train when the train is running,and compared with the specification requirements.(3)Based on the vehicle-rail-bridge coupling model,the train wind load is applied and the randomness of the wind field is considered,and the train operation safety is analyzed.Based on Cooper theory and the principle of harmonic superposition,a random wind speed at a certain wind speed is obtained,and further random pulse power is obtained,and the pulsed pneumatic power is introduced into SIMPACK to obtain a high-speed train on a flexible track Safety index of operation when affected by random pulsating wind.(4)Based on the reliability theory,the established car-rail-bridge coupling analysis model is used to analyze the reliability of high-speed train operation safety.The reliability of the operation when the random pulsating wind is affected,and finally the probability characteristic wind speed curve when the high-speed train is affected by the random pulsating wind on the flexible track.