Speed ​​train - Elastic Bearing Block Ballastless Track System Of Vertical Vibration Analysis

With the rapid development of passenger dedicated lines and city mass transit in China, it is necessary to analyze the dynamic performance of more new ballastless tracks. As one of the ballastless tracks structure patterns, low vibration track has some merits: the good vibration and noise reduction performance; the simple structure; the construction convenience; may repair and so on. This paper mainly studied the dynamic response of the coupling high-speed train and the low vibration track. The prime work is as follows.Respect to its structure character, taking the low vibration track between two neighboring fastenings as a track unit (actually it is a small section of low vibration tract). In this model, rail is simulated as continual elastic supporting Euler beam, the pad under rail is simulated as linearity spring and damper. The concrete supporting block is connected by the rubber gumshoe and the pad under block, and simulated as quality block connecting the slab through linearity spring and damper. The slab (including the concrete foundation) is regarded as the elastic plate, its elasticity coefficient can be obtained by using the equivalent method. The connection between concrete foundation and subgrade is simulated as linearity equispaced surface spring and damper. Now, the low vibration track in this paper is separated as 24-degree of vertical vibration freedom finite element model, and the vehicle is simulated as 6-freedom multi-body model. On this foundation, based on the principle of total potential energy with stationary value in elastic system dynamics and the rule of "set-in-right-position" for formulating system matrixes, inferred every part's vibration total potential energy, established the high-speed train and low vibration track vertical vibration equation, and by using "fortran" , simulating program is constructed accordingly.According to the above analysis method and program, the vertical vibration responses of the system be calculated, the comparison between the static and dynamic results is made. Both the calculated waveforms and values are in accord with the physic concept. All of these demonstrate the correctness and feasibility of the dynamic analysis model of the low vibration track.The effect of parameters of the low vibration track on the vertical vibration responses of the system is analyzed and the rational parameter ranges for the low vibration track design are obtained.