With the construction of railway passenger line and the rapid development of urban rail transit, ballastless track to stability, stiffness even, durability, less maintenance of a railway track structure development. Many countries have invested a great deal of manpower and financial resources to carry out on non-ballasted track structure a long-term, systematic research and has developed hundreds of non-ballasted track structure.However, due Ballastless environmental vibration and noise is more prominent, or even seriously affect people's work and life, has aroused great concern from related departments. Therefore, Vibration Ballastless track structure because of its good NVH performance is more and more countries and regions with, but the structure type of many different parameters, how to determine the dynamic point of view, or vibration of Interpretation Ballastless Track reasonable match between the stiffness and damping properties, has important theoretical and engineering application. First, the paper from the perspective of noise and vibration, this paper analyzes the damping mechanism of track system, combined with the equivalent of three degrees of freedom model instance of the force, acceleration, displacement, orbital dynamics as the relationship between performance evaluation, analysis show that the orbital dynamics using force as a performance index and acceleration, displacement, orbital dynamics as the performance index evaluation of damping effect on the track in good agreement for reasonable Damping Ballastless dynamic analysis of the stiffness theoretical basis.Secondly, this type of slab track to vibration, ballastless ladder-shaped track, floating slab track, elastic support block track, flexible long sleeper buried ballastless track and fasteners for the study of four damping the finite element analysis software ANSYS, the actual track structure based on the establishment of various parameters of the dynamic model of track structure, research and analysis of the impact load of various dynamic characteristics of vibration-type orbits determined stiffness components Ballastlessreasonable matching relationship. Finally, in the reasonable range of track stiffness, the comparative analysis of the various vibration-type track, fastening of the vibration damping performance. The results show that the floating slab of steel spring damping Ballastless the best, followed by the non-ballasted ladder-shaped track, elastic support block track, flexible long sleeper buried track, Damping damping of slab track and the fastener. The results of this research paper on the practical engineering vibration Ballastless Track stiffness design selection and a reasonable reference value.
Key words: slab track; impact load; dynamics; damping performance; reasonable stiffness
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