| For mixed passenger and freight railway of 200km/h and above,due to the characteristics of large passenger and freight speed difference and axle load difference,the vibration intensity of the track system will increase,thereby accelerating the deformation and destruction of the track equipment and reducing the use of the track structure.life.As the total passing weight continues to increase,problems such as increased rail wear and increased transportation risks will also be caused.If passenger and freight transportation are completed in the form of "moving goods without meeting",or passenger trains run on the same line with freight trains after speed reduction,the line capacity cannot be fully utilized and the economic benefits of the railway cannot be maximized.Therefore,research on passenger and freight railroads of 200km/h and above is extremely important for ensuring the safety of train operation,reducing maintenance and repairing workload,and giving full play to the benefits of railway transportation.This paper studies the dynamic response and rail profile development of passenger and freight railroads with a capacity of 200km/h and above.The specific research content is as follows:(1)Research on the plane and longitudinal section parameters of mixed passenger and freight railwayStarting from the current status of railway operations in my country,based on the speed matching relationship between passenger cars and freight cars,mixed passenger and freight railway are divided into high-speed line,express line and busy line.In view of the above sub-levels,based on the "Railway Line Design Code",the values of the minimum curve radius,minimum transition curve length and other line parameters are studied,and recommended values that meet the specification conditions are given.(2)Establish train line dynamics model and rail profile development simulation modelFor the high-speed line,express line and busy line,the corresponding vehicle models are established respectively,combined with the flexible track model and the wheel-rail contact model to further complete the creation of the train line dynamics model.On this basis,the Archard material wear theory is introduced,and the multi-condition parallel calculation method is adopted to establish a rail profile development simulation model and verify the reliability of the model.(3)Dynamic response analysis of curved section of mixed passenger and freight railwayThrough the research and analysis of the vehicle dynamic performance and track dynamic response when the train passes through the curve section,it can be found that as the curve radius increases,the vehicle dynamics indicators show a downward trend as a whole,and the track dynamic response is divided into outer rail and inner rail.Different laws of change.(4)Analysis on the influence of mixed passenger and freight volume ratio and speed distribution on the evolution law of rail profile1)With the increase of the passenger and freight volume ratio,the rate of rail profile evolution also increases,and when the passenger and freight volume ratio is less than3:1,this trend is obvious.When the passenger and freight volume ratio exceeds 3:1,the rate of rail profile evolution is weakened.2)When the train passes through with the speed distribution,as the skewness changes from 0.567 to-0.567,the evolution of the rail profile is first suppressed,then the suppression effect is attenuated,and finally the rail wear intensifies.It can be seen that the skewness is positive,that is,when the train speed distribution is dominated by low speed,it can inhibit the evolution of the rail profile.一般为1000个左右实词。... |
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