In rail tracks, track vibrations are caused by the large forces between wheels and rail. Dynamic contact forces in response to wheel and rail roughness produce track vibrations over a wide range frequencies. In addition, the distributions of axle loads in a train also track vibrations at lower frequencies, almost below 20Hz. In track vibrations, vibrations at lower frequencies, below 200Hz affect buildings and structures near rail tracks. In order to decrease these vibrations, rail track system with viscoelastic vibration isolation materials is constructed.
In this study, vibration characteristics such as dynamic contact force, force transmissibility, transmitted force to the concrete slab, and deflections of rail and sleepers of track with viscoelastic vibration isolation materials are analyzed.
To do this, governing equations of a track model are derieved and the material properties of isolation components with respect to various test conditions ralated to temperature, pre_load, dynamic amplitude, and frequency are extracted, then, in computer simulations dynamic characteristics of tracks with the existing isolation components and the variation of dynamic characteristics of tracks through the variation of material properties are analyzed and the effects of environmental conditions of vibration isolation materials in dynamic analysis are considered