Research On Dynamic Characteristics Of CRTS? Vibration Reducing Slab Ballastless Track Of High-speed Railway

With the rapid development of high-speed railway technology in our country,the characteristics of high speed train,such as large capacity,high speed and dense traffic,will have a profound influence on the dynamic performance of high-speed railway.At present CRTS? vibration-type plate track is one of the main rail structures in high-speed railway,which provides a guarantee for the safe and stable operation of high-speed trains.In this paper,based on a certain type of high speed train and CRTS? type vibration ballastless track on soil subgrade as the research object,the coupling model of high speed vehicle-track-soil subgrade was established.The influence of the change of track structure parameters on the vibration response of the system was studied.The three-dimensional rail multi-layer structure(including soil subgrade)model was established by using ANSYS software.The modal analysis was carried out by using the reduction method to obtain the natural frequency and vibration mode of the underfloor foundation.The effect of elastic modulus variety of fastener and damping layer on the natural frequency of the system was researched.It is found that the elastic modulus of them has little effect on the structure,and it can be neglected.Under the condition of satisfying the deformation coordination condition and the relevant specification,the elastic modulus of the bed surface and the basement bed should be increased to reduce the vibration frequency of the system.The finite element model of rail multi-layer structure is introduced into UM software,and the vehicle-track-roadbed coupling model is established and simulated.The low disturbance spectrum of Germany is used as the orbit excitation to study the influence of orbital structure parameters on the dynamic response of the rail system.The results show that:(1)The stiffness of the fastener is 40 kN/mm ~ 90 kN/mm,and when the stiffness of the damping layer is between 20 MPa/m and 100 MPa/m,the vibration response is minimum.(2)The increase of elastic modulus of Subgradeunder track structure dynamic system response is most obvious.(3)The longitudinal connection of vibration reducing slab ballastless has little influence on the response of the coupling system.The results of this paper provide a technical reference for the design of dynamic parameters of CRTS? Vibration Reducing Slab Ballastless track,which has important theoretical and practical significance.