Analysis Of Train Vertical Vibration Characteristics And Vibration Isolation Control

With the rapid development of domestic high-speed railways,the vibration problem caused by rail transit is becoming more and more serious.In order to reduce the various negative effects of vibration,the corresponding scientific researchers have already started to study the mechanism of train vibration and the law of transmission.Referring to the previous research results,this thesis establishes a large system model of vehicle-track-soil-building,aiming to explore the impact of train vibration on the train itself and the surrounding environment,and to study the effect of trenching distance changes on the vibration isolation efficiency of open trenches.The main work of this thesis is as follows:(1)Vertically Coupled Random Vibration Analysis of Vehicle-Track Coupled Systems.In this thesis,the ten-degree-of-freedom vehicle model and the elastic support block track model are used as examples to derive the equation of motion respectively;and the Hertz nonlinear contact model is used to calculate the vertical force between the wheel and rail to realize the vehicle-rail vertical coupling,and obtain the vehicle-track The vertical random vibration equations of the coupling system are simulated,and the new integral method is used for simulation calculation with MATLAB software to simulate the vibration response of each component under the influence of track irregularity when the train is running.Analyze the obtained results,and put forward reasonable suggestions to improve the comfort and stability of the vehicle based on the obtained results.(2)3D modeling and vibration response analysis of soil-building systems.In this thesis,the ABAQUS software is used to establish a threedimensional model of the soil-building system.The model boundary is loaded with a viscous artificial boundary.The Mohr-Coulomb yield condition is applied to the soil,and the model is layered according to the distribution of the soil layer,and the building is replaced by the element beam structure.thing.Load the rail under force,obtain the peak acceleration and displacement curves of the surface and buildings through model simulation,and analyze the image to obtain the propagation law of vibration in the soil and the vibration response of buildings at different distances.(3)Vibration isolation research.In this paper,the open trench isolation method is adopted,and the open trench is excavated at different positions between the soil and the building,and compared with that without trench under the condition of constant load.By analyzing the vibration response results of the ground surface and the building at different positions,the isolation efficiency of the open trench is analyzed,and the best position for the soil and the building to excavate the open trench is obtained.Based on the above analysis results,the optimal location of vibration isolation trench excavation is given for the whole soil-building system model.