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针对轨道交通车辆在以中等车速120 km/h和140 km/h运行时轨道动态响应较大的问题,采用特征频率分析及动态位移限定等方法对该工况下轨道减振器(轨道扣件)的刚度进行合理设计,并在选择的刚度范围内对车辆、轨道的安全性能及动态响应进行校核。通过计算得到适合的扣件垂向刚度范围为17—25 k N/mm,且在此范围内车辆脱轨系数及倾覆系数都小于0.8。与普通型扣件相比,在1—80 Hz范围内,道床在减振扣件(GJ-32)系统中的垂向总Z振级降低8.7 d B,地基垂向总Z振级降低5.7 d B。
Aiming at the large orbit dynamic response of rail transit vehicles running at moderate speeds of 120 km / h and 140 km / h, the characteristics of the track shock absorber (track fastener ) Of the stiffness of a reasonable design, and within the selected stiffness range of vehicles, track safety performance and dynamic response check. The calculated vertical stiffness of the fastener is calculated to be 17-25 kN / mm, and within this range the vehicle derailment factor and the overturning factor are both less than 0.8. Compared with conventional fasteners, the total vertical Z vibration level of ballast bed in vibration damping fastener (GJ-32) system decreased by 8.7 d B in the range of 1-80 Hz, and the total vertical Z vibration level in foundation bed decreased by 5.7 d B.