1520mm宽轨距减振型无咋轨道结构动力学分析

Dynamic Analysis of 1520mm Wide Gauge Vibration Damping Ballastless Track Structure

为研究1520mm宽轨距减振型无咋轨道的结构动力学性能,运用车辆-轨道耦合动力学理论,并采用ANSYS有限元软件建立了详细的减振型和非减振型无咋轨道有限元模型。对比于高速客车、货车及动货车对轨道的作用可知:动货车具有较大的轴重和速度,对轨道结构有较强的冲击力作用,其轨道各层应力幅值均较大;而高速客车由于运行速度最快,轮轨相互作用频率高,轨道各结构部件加速度幅值均远大于货车对应的加速度幅值。减振型无咋轨道增大了道床板振动加速度和表面Mises应力,但减振垫层使底座板加速度衰减速率增大,并且加速度幅值降低了68%,Mises应力降低了29%,起到了一定的隔振作用并缓冲了列车动荷载对轨道结构的直接冲击作用。

In order to study the structural dynamic performance of vibration damping ballastless track with gauge of 1520mm.Used on the theory of vehicle-track coupling dynamics and finite element software of ANSYS,a finite element model of vibration-damping and non-damped ballastless track was established.As the moving truck had a large shaft weight and speed,the track structure had a strong impact force,the amplitude of stress of the track were larger.But the high-speed train due to the fastest running,wheel-rail interaction frequency was high,the track structural components of the acceleration amplitude was much larger than corresponding acceleration amplitude of the truck locomotive.The damping type ballastless track increases the vibration acceleration and the surfece Mises stress of the track slab.However,the damping cushion layer increases the acceleration decay rate of the base plate,and reduces the acceleration amplitude by 68%,and the Mises stress is reduced by 29%,which has a certain vibration isolation effect and buffers the direct impact of the train dynamic load on the track structure.