| The systematic study Of floating slab track with good damping effect has important practical significance. In this paper, the three-dimensional finite element model of steel spring floating slab track and the vertical coupling dynamic model of the vehicle track are established by using ANSYS software, then Modal analysis and transient dynamic analysis are carried out respectively. The paper mainly discusses about the influence of the parameters on the natural frequency and vibration of the track system and the influence of the support failure on the track dynamic characteristics. The main contents of this paper are as follows:(1)A three-dimensional finite element model of steel spring floating slab track was established. The modal analysis of the track structure is carried out by the reduction method, and the natural frequencies and modes are given, and the influence of the parameters on the natural frequency of the system is analyzed. Research shows that the fastener stiffness can not be considered as a key consideration. In the condition of deformation compatibility and other safety factors, the support stiffness of steel spring can be reduced. On the premise of meeting the requirements of the relevant specifications, the spacing of the steel spring support can be increased, and the thickness, density and length of the floating slab are also should be increased.(2)The vehicle track vertical dynamic analysis model is established by ANSYS software. The influence of parameter variation on the dynamic characteristics of the track is analyzed by using the full method. Research shows that reducing the stiffness of fastener is advantageous to reduce the dynamic characteristics of the track. suggested that the fasteners and steel spring damping values between 50~200 kN·s/m and 50~100 kN·s/m respectively. The value of steel spring stiffness should be considered comprehensively. the contradiction between force and vertical displacement and vertical acceleration. The support spacing of steel springs is recommended to take 1.25 m as the optimum. The density of floating slab is recommended to take 2 500~3 000 kg/m3. In order to achieve the perfect match of the speed and the demand of reducing vibration and noise, we should set up the driving speed reasonably.(3)According to the vehicle track vertical coupling dynamic model, the effect of the failure of the fastener and the steel spring on the dynamic response of the rail system under different conditions are analyzed. Research shows that the more failure of the fastener and the rail, the more significant changes in the dynamic response of the rail system. the failure of the fastener spacing is easily lead to a range of track geometric irregularity. The influence of fastener failure is greater than that of steel spring failure, and the inspection and maintenance of fasteners should be strengthened. |
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