Study On Vibration Performance Of Long Elastic Sleeper Vibration Reduction Track Structure Of Metro

With the rapid development of urban rail transit, the vibration problem of track structure gets more and more attention of people. In order to meet the demand for passengers’comfort, and to reduce the influence of the track structure vibration in subway on surrounding environment, it is urgent to study the vibration characteristics of the track structure in subway.Long elastic sleeper track structure is a new type of track structure which can reduce noise and vibration and can play a very good role. But long elastic sleeper for ballastless track structure in China is lack of systematic research and application results. Therefore, this article will study the theory analysis of vibration and safety aspects. Mainly include the following contents:For the analysis of long elastic sleeper track structure vibration characteristics, this article use dynamic analysis software ABAQUS to establish a vehicle-track-substructures spatially coupled dynamics model at the linear sections and curve sections. And from the driving safety and comfort aspects, analyse the dynamic response and compare with the short elastic sleeper track structure. The results show that:the long elastic sleeper track structure has certain advantages in the lateral stability, the effect of vibration reduction and control of corrugations and so on.For the analysis of long elastic sleeper track structure vibration reduction effect, this article use three aspects:modal analysis, transient analysis and operation process simulation analysis and from the point of view of frequency domain analysis to analyse itself vibration characteristics, vibration transfer rules and the influencing factors of vibration reduction effect of long elastic sleeper ballastless track system. The results show that:The natural frequency of long sleeper is about67Hz, and the backing board under sleeper plays a good vibration reduction effect in the low frequency band.For the analysis of parameters affect of long elastic sleeper vibration track structure at linear sections and curve sections, This article analyzes the influence of the driving speed, fastener stiffness, backing board stiffness under sleeper, rigidity matching and change of gauge to track dynamic characteristics. According to the vibration acceleration of the track and vehicle, from the angle of vibration reduction we will analyse contrastively of different vibration track structure parameters. On this basis, we put forward some suggestions for the long elastic sleeper track structure design. Consider the requirements of vibration reduction effect and the track structure deformation, the driving speed of the linear sections is controlled in the design speed, and the curve sections can take the speed limit way. The fastener stiffness should not be too much and maintain the status quo. The backing board stiffness under sleeper can be increased and should be concerned about the selection of materials and maintenance. The ratio of fastener and the suboccipital plate stiffness should be controlled at0.7to1.2. The sets of boots lateral stiffness can be appropriately increased.