The Theoretical Research And Numerical Analysis Of Environmental Vibration Isolation Caused By WIB Of The Operation Of Train

During china’s "13th Five-Year Plan" period,the rapid development of rail transit,train speed is getting faster and faster,the ambient vibration caused by the operation of trains is becoming more and more serious,meantime,due to people’s living standards are improving,the comfort of being in the surrounding environment is more stringent requirements.Therefore,the study of vibration reduction caused by the environmental vibration caused by rail transit has very important theoretical significance and application value.Based on the vibration reduction of wave impeding block(WIB),this paper studies the regularity of ground vibration caused by running trains from the aspects of theoretical derivation and numerical simulation,and the primary research contents and findings are as follows:1.According to the propagation theory of elastic wave,the vibration transfer function relationship between track-WIB-soil is studied by modal analysis method,and the calculation program is compiled in MATLAB language.2.Two computational models of train-track and track-WIB-soil are established,the boundary conditions are considered,and the wheel-rail force obtained by the interaction between the train and the track is used as the loading incentive source of the latter model,and the vibration regularity of the soil surface caused by the running train is studied.3.The three-dimensional analysis model of track-WIB-soil is established by applying finite element analysis method,and taking into account the different structural parameters of WIB,from the time domain analysis and frequency domain analysis,the WIB vibration isolation regularity caused by the operation of the train is studied,and the results of vibration response are compared with the vibration response results obtained by the track-WIB-soil numerical model established by MATLAB language programming.4.In this paper,numerical analysis show that the effect of applying WIB vibration isolation is obvious,and increasing the thickness and width of WIB,reducing the buried depth of WIB,or the material with a large elastic modulus of WIB,which can improve the vibration isolation effect of the ground.In addition,WIB setting is more efficient for vibration isolation measures for low-and medium-frequency(0-40Hz)vibrations.The research results of this paper provide some reference for the study of vibration reduction on the ground caused by running trains.