Analysis model of vertical vibration for rubber floating slab track

According to the structural vertical vibration characteristics of rubber floating slab track,a composite element dynamic analysis model of track section was established.In the model,Euler beam element with continuous elastic supports was used to simulate steel rail.Floating slab track was taken as elastic thin plate and was discreted by longitudinal and lateral directional finite strip elements.Linear spring and damp were regarded as fastener and rubber support.Based on the principle of total potential energy with stationary value in elastic system dynamics and the set-in-right-position rule for formulating system matrices,the total potential energy of vertical vibration of train and track was obtained and the matrix equation of vertical vibration was established to analyze the vibration properties.Analysis result indicates that the maximum reduction rate of wheel load is 0.597,the maximum vibration acceleration of car body is 0.846 m·s-2 and the vibration isolation efficiency of the track system is between 20% and 27%.Obviously,the vertical model accurately describes the dynamic response properties of vehicle and track.2 tabs,4 figs,9 refs.