Research On Dynamic Characteristics And Dynamic Vibration Absobers Of Ballastless Track

Ballastless track is a new kind of track that uses concrete or asphalt track bed instead ofballast bed. It has the remarkable characteristics of low Maintenance, high stability, highsmoothness and good durability. Railway line maintenance is reduced and its utilization rate isimproved by using ballastless track. The safety and speed of train negotiation are bothimproved. Ballast is a Kind of non-renewable resourees. Ballastless track is beneficial toenvironmental protection because the use of ballast is reduced. Ballastless track is moreeconomic than ballast track in long run. With the constant building of high-speed railway,speed of the train has improved a lot. Accordingly, the track structure has become increasinglydemanding. The ballastless track has replaced the ballasted rail in track structure. Therefore, ithas become a basis to research on the dynamic response of ballastless track and floating slabin evaluating the track structure of high-speed rail.At the same time, Improving a new methodto decrease the vibration become a key job of ballastless track rail and floating slab. From theslab ballastless track source, structure of dynamic vibration absober is applied to wheel/rail, inorder to reduces vibration from the source, and achieves good results.The main contents of this paper are as follows:1,By using ANSYS, a three-dimensional dynamic finite element model of ballastlesstrack rail–floating slab was established. After rail-floating slab structure model analysis inANSYS,natural frequencies and modthod is get.2,According to model established, the model takes into account of the track irregularitycase,and adopts on transient dynamic method. the analysis the dynamic responsecharacteristics of the rail and floating slab under the vertical force in the track structure. Themodel corresponding numerical simulated program is compiled by the MATLAB software.Rail with floating slab's vertical displacement's and vertical acceleration's power spectraldensity is produced.3,While the vehicle velocity is in 200 km/h or 350km/h, the influence of velocity on thedynamic responses of Slab ballastless track is studied.4,Simulation result shows that comparing with existing methods, the rail structure modelestablished is feasible.5,Between two adjacent simplified for rail fastener main vibration dampingsingle-degree-of-freedom system, and with three dof damping vibration absorbers, forexample, a rail - dynamic vibration absorbers mathematical model is establish. The dynamic vibration absorbers obtain optimal damping effect of optimization goal is produced. The raildynamic vibration absorbers parameters is calculated by using numerical optimization method,and its location is determined.6,According to the design of dynamic vibration absorbers, Through ANSYS softwaredynamic vibration absorbers of finite element model is established, added in the beforementioned in the model.When it takes into account of the track irregularity case, the modelinstalled the dynamic vibration absorbers is analysed by transient dynamic method,Conclusion is got by comparing the conclusion of no installation dynamic vibration absorbersand installation dynamic vibration absorbers.