Study On Vibration Mechanics Characteristics And Vibration Reduction Measures Of Floating Slab Track Structures

With the development of urban rail transit,the problem of vibration and noise caused by subway operation is becoming more and more serious.Vibration reduction has become an urgent problem in urban construction,studying the vibration characteristics of orbit structure is of great theoretical significance and engineering application value,With the study of the vibration and noise reduction of orbit structure,the orbital structure presents a variety of forms,the best effect of vibration reduction and noise reduction is the floating slab track structure.This paper is based on ANSYS finite element analysis software,the coupling dynamics model of vehicle track structure is established,modal analysis and dynamic analysis of the structure were carried out.In this paper,modal analysis of floating slab track structure model is carried out firstly,In ANSYS software,the reduction method is used to analyze the modal analysis of the structure,the first eight modes and inherent frequencies of the structure are obtained,The influence of the parameters of the orbital structure on the natural frequency of the structure is analyzed,the results show that the stiffness of the fastener has little effect on the natural frequency of the structure,the emphasis of the researchers the support stiffness and damping of floating slab,in order to meet the structural deformation and safety conditions,the stiffness of steel spring can be reduced properly.In order to meet the structural deformation and safety conditions,the stiffness of steel spring can be reduced properly.The thickness and length of the floating slab should be considered at the same time,the elastic vibration isolator is the core damping element of the whole structure,stiffness and damping of elastic vibration isolator are the key points of research,in addition to analyzing its effect on the natural frequency of the structure,the speed of the subway is different on different sections,the damping effect of stiffness and damping are different at different speeds,Therefore,it is necessary to analyze the stiffness and damping of the damping effect at different speeds.By obtaining the acceleration time curve of the orbital structure,the effective acceleration of orbital structure vibration is acquired.The evaluation index of vibration acceleration is introduced,evaluation of the vibration reduction effect of the track structure is carried out,the effect of vibration reduction under different parameters is analyzed,the best design parameters for vibration reduction are obtained.