Dynamic Performance Analysis Of Floating SLAB Track With Steel Spring

The steel spring floating slab track is commonly used in urban rail transit vibration isolation track.and it proved a good effect in major cities of China.but the dynamic analysis and evaluation of floating slab track is not enough. In this paper, the dynamic analysis and evaluation of floating slab track is conducted. For this analysis.it will surely provide useful reference for localization of steel spring floating slab track.Drawing on the basis of previous research experience, parameters were mostly taken from Chengdu Metro Line1in this paper. Analysises of this paper were taken by means of finite element analysis software ABAQUS and multi-body dynamics software ADAMS. With this, modal analysis, vibration isolation efficiency analysis, vehicle dynamics performance analysis and environmental study of the propagation of vibration were represented.First, the damping principle and design of steel spring floating slab track is introducted. At the same time, the construction technology of steel spring floating slab track is represented.Secondly, a three-dimensional solid model of steel spring floating slab track is established, then followed by a modal analysis. The purpose of this analysis is to study the influence discipline of fastener stiffness, the weight of floating slab, spring stiffness and spring arrangement for floating slab system natural frequency and isolation efficiency. This study shows that floating slab track has high vibration isolation efficiency for high-frequency load. In order to achieve better vibration isolation effection, increasing the corresponding weight of floating slab track bed and choosing appropriate spring is necessaryThirdly, based on vehicle-track coupling dynamics model, vehicle dynamic performance is evaluated at safety index and comfort index for different speeds or spring layout. The analysis can provide guidance suggestion on design and operation of floating slab track.Finally, floating slab-tunnel-soil two-dimensional dynamic finite element model is established to study the vertical and horizontal vibration attenuation law. This analysis aims to stydy the weight of floating slab, tunnel depth and steel spring stiffness on the vibration propagation law. Through the numerical calculation above, the vibration in all conditions proposed sphere of influence and in engineering practice should pay attention to.