轨道交通场段钢弹簧浮置板减振轨道刚度研究

Research on the Damping Stiffness of Steel Spring Floating Slab Used in Urban Rail Transit

研究目的:对于进行上盖物业开发的车辆段和停车场,为了有效降低振动的影响,通常选用减振型轨道结构。钢弹簧浮置板是其中减振效果较好的轨道结构,但其目前只运用在车辆运行速度较高的正线。有必要对速度一般不超过30 km/h的车场线用钢弹簧浮置板减振轨道支撑刚度的合理取值范围进行研究。基于车辆-轨道耦合动力学理论,建立三维动力学仿真模型,研究钢弹簧浮置板减振轨道支撑刚度变化对车辆、轨道系统动力学响应的影响规律。研究结论:(1)随着钢弹簧浮置板减振轨道支撑刚度降低,减振效果显著提高,轮轨力和车辆运行平稳性指标有所降低;(2)车场线内钢弹簧支撑刚度降低到4 kN/mm时,虽然钢轨垂向位移超出了《浮置板轨道技术规范》的要求,但其减振效果提高了37.4%,轮轨力、钢轨加速度和车体加速度均未超出正线工况下对应的响应值;(3)本研究对车场线用的新型钢弹簧浮置板减振轨道是有必要的,结果可为类似工程提供借鉴和参考。

Research purposes:In order to effectively reduce the impact of vibration,for the depot and parking lot where the superstructure is developed,the vibration-damping track structure is usually selected.The steel spring floating slab is a track structure with a better vibration reduction effect,but it is currently only used in the main line where the vehicle runs at a higher speed.It is necessary to study the reasonable value range of the support stiffness of the steel spring floating slab vibration damping track for the yard line whose speed generally does not exceed 30 km/h.Based on the theory of vehicle-track coupling dynamics,a three-dimensional dynamics simulation model is established,and the influence of the stiffness of the steel spring floating slab damping track support on the dynamic response of the vehicle and track system is studied.Research conclusions:(1)As the support stiffness of the steel spring floating slab vibration damping track decreases,the vibration damping effect is significantly improved,and the wheel-rail force and vehicle running stability indicators are reduced.(2)When the steel spring support stiffness in the yard line is reduced to 4 kN/mm,although the vertical displacement of the rail exceeds the requirements of the Technical Code for Floating Slab Track,its vibration reduction effect is increased by 37.4%,and wheel-rail force,rail acceleration,and vehicle body acceleration do not exceed the corresponding response value under the normal line condition.(3)It is necessary to study a new type of steel spring floating slab vibration damping track for vehicle parking lot section lines,and this study can provide a theoretical reference for similar projects.