考虑车轨垂向耦合福州地铁振源加速度研究

Research on Acceleration of Vibration Source from Fuzhou Metro Considering Vehicle-Track Vertical Coupled Model of Vibration

为了研究福州地铁振源系统加速度,进而可以直观准确地分析土层传播规律和衰减特性,笔者建立了车轨垂向耦合振动模型,应用了福州地铁列车和轨道参数,计算了在一定车速下,振源系统各部的垂向加速度,并分析了车速的影响。结果表明,车体振动反映了自身的自振频率;转向架、轮对、支承块和道床有一定的主频集中区,且轮对和支承块在高频区还分别存在一个高频赫兹接触运动引起的第二主频。振源系统的轨道扣件和块下橡胶垫具有较好的减振能力,随着车速的增加,垂向加速度逐渐增大,同时减振效果趋于稳定。

In order to study the acceleration of the vibration source system from the Fuzhou Metro and to analyze the propagation law and attenuation characteristics of the soil along the metro lines,the vehicletrack vertical coupled model of vibration is established.Based on the parameters of the Fuzhou Metro,all parts of the system′s vertical accelerations are counted under a certain speed,and the effect of speed alteration is analyzed.The analysis results show that:the carriages vibrate with their natural frequency;some areas of dominant frequency concentration exist from the bogie,wheelset,supporting block and track bed;and the second peaks are caused by high-frequency contact between the wheelset and supporting blocks.Track fasteners and rubber bearings can improve anti-vibration capability,and vertical acceleration increases with subway speed,while damping effects tend to stabilize.