Abstract:

Abstract: To inquire into the steel spring stiffness and density of the floating slab of elevated steel spring floating slab track the influence law of vibration damping characteristics, by building the vehicle - train-bridge coupling model of floating slab track (FST), from the Angle of time and frequency domain analysis, for the design of the steel spring floating slab track parameters provide theoretical basis for the reasonable selection and combinatorial optimization. The results show that the vibration level of the floating plate increases with the decrease of the steel spring stiffness in the range of 2 ~ 20Hz. In the frequency range of 16 ~ 125Hz, the vibration level of the centerline, the flange, the web and the beam bottom of the track decreases with the decrease of the stiffness of the steel spring, and the maximum value is reduced to 13dB. The stiffness of the steel spring has obvious effect on the transfer function. The smaller the stiffness of the steel spring, the smaller the value of the vertical transfer function of the floating plate to the bridge structure. Considering steel spring stiffness change on the influence of bridge structure vibration level and the impact on the transfer function, in the design of floating slab track structure suggestion will steel spring stiffness control in 6 ×106 N/m ~ 8×106 N/m. The increase of the floating plate density will reduce the vibration level of the system to a certain extent. In actual design, the floating plate density should be reasonably set, and the proposed control should be controlled at 2800kg/m3 ~ 3200kg/m3.

摘要：

摘要：为探讨钢弹簧刚度和浮置板密度对高架钢弹簧浮置板轨道减振特性的影响规律，构建车辆-浮置板轨道-桥梁耦合模型，从时频域的角度对其进行了分析，为钢弹簧浮置板轨道的设计参数的合理选择与组合优化提供理论依据。研究结果表明：在2 ~ 20Hz范围内浮置板的振动水平随钢弹簧刚度的减小而增大。在16 ~ 125Hz频率范围内，轨道中心线、翼缘、腹板、梁底的振动水平随着钢弹簧刚度的减小而减小，最大减幅达到13dB。钢弹簧刚度的变化对传递函数的影响比较明显，弹簧刚度越小，浮置板到桥梁结构的竖向传递函数值越小。综合考虑，在设计浮置板轨道结构时建议将钢弹簧的刚度控制在6×106 N/m ~ 8×106 N/m。浮置板密度的增大会在一定程度上减小系统的振动水平，实际设计中要合理设置浮置板密度，建议控制在2800kg/m3 ~ 3200kg/m3。

关键词: 振动与波, 轨道交通, 浮置板轨道, 减振特性, 参数优化, 高架箱型梁