Applicability Study On Axle Load And Speed Of Low Vibration Track

Low vibration track(LVT)as a kind of ballastless track structure that can absorb shock and reduce noises,has the advantages of less noise and good flexibility,so it has been widely used in the tunnel and subway all over the world.With the increase of train axle load and speed,the impact between wheel and rail gets larger.Except that,the geometrical morphology of the rail is worse and the speed of the damage for track structure accelerates is quicken,And the track component service life and maintenance cycle are shortened.So the maintenance workload becomes larger.Therefore,a heavy haul/high speed train-ballastless track dynamic model was built according to the LVT to analyze the axle load limit of LVT in heavy haul railway and the speed applicability of LVT in high speed railway.The main research contents are as follows :(1)A dynamic model of heavy haul/high speed train-LVT was built by using the simulation technology with UM and ANSYS software.(2)Considering the coupling system of wheel-rail interaction forces,driving stability and safety,the dynamic properties of track structure,the applicability evaluation indicators of the LVT has been established.(3)The axle load limit of LVT in heavy haul railway is proposed by calculaing the changes of driving safety and stability,wheel-rail interaction forces,and the dynamic properties of track structure with the impact of different axle loads by using this mode.(4)The speed limit of LVT in heavy haul railway is proposed according to sensitivity analysis and frequency domain analysis of the calculation results on the changes of driving safety and stability,wheel-rail interaction forces,and the dynamic properties of track structure with the impact of different speed by using this mode.Finally,this thesis can provid the theoretical basis on the selection of the ballastless track in heavy haul railway or high speed railway in the future.