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

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.