The Simulation Research on the Vibration Insulation Performance of the Floating Slab Track Structure

The finite element model of train and track structure of track-traffic coupling system is established.The track irregularity is considered as the exciting source of the coupling vibration of train and track structure.The system vibration performances of the two coupling systems of train/ballast track structure and train/floating slab track structure are simulated.The system vibration responses and the system transfer functions of the two structures are contrasted and analyzed,and the vibration insulation performance of the floating slab track structure is estimated.The analysis results demonstrate that contrasting floating slab track structure with ballast track structure,the vibration acceleration is reduced by almost 70%,the vibration acceleration responses amplitude of ground at 5 m from the line is reduced by about 62.8%,corresponding Z is reduced about 10 dB and the vertical vibration acceleration frequency is reduced from 0—200 Hz to 0—60 Hz.The vibration insulation performance is effective.