Optimization Design Research On Vibration Reduction Of Steel Spring Floating Slab Track

With the rapid development of rail transit in recent years, it brings muchconvenience to our life and work. However, the vibration and noise problems itproduces has begun to affect people’s daily lives at the same time. As one of the mostwidely used measures in the world to reduce vibration and noise, steel-spring floatingslab track structure system can effectively reduce vibration caused by train. With theaid of Visual Fortran and ANSYS10.0, the design of the steel spring floating slabtrack is optimized according to the actual test results. Also, the feasibility of thedesign is verified. The major contents are as follows:(1)Large number of domestic and foreign literature was checked, and thecharacteristics and current application of steel spring floating slab track system werecarefully analyzed.(2) The data based on test detection was collected and analyzed which providerealistic basis for the optimization work of steel spring floating slab.(3) The design of steel spring floating slab was optimized by changing size of thefloating plate with the help of Visual Fortran programming and the relative floatingslab track vibration-reduction principle. The optimal size of steel-spring floating slabwas determined: length30m, width2.6m, thickness40cm. And verified by test,finally it is concluded that: compared with the existing floating slab track, verticalvibration acceleration level of steel rail and floating slab of the new one increased2.4dB and5.3dB respectively; vertical vibration acceleration level of the tunnelwall reduced4.5dB; lateral vibration acceleration of the tunnel wall reduced10.0dB.(4) A finite element model of steel-spring floating slab track was established byusing ANSYS10.0, and the dynamic characteristics of new steel spring floating slabtrack were analyzed. The results show that: natural frequency of vibration of the newsteel-spring floating slab reduced, and it is conducive to reducing vibration.(5)The global stiffness of transition section of the floating slab wassystematically analyzed. After calculation, it shows that: the global stiffness increasedwith the increase of the length of the transition section. Therefore, the length oftransition section in the actual construction period should not be too long. The optimallength of the transition section is20m. Through the actual test, to see the new steelspring floating slab section than the existing transition section damping effect is obvious, achieving the target of optimization design.