| Train body is the main load-bearing component of the vehicle,whose strength and stiffness must meet the requirements of the design standards,to ensure the stability,comfort and safety of a vehicle in its running process.The steel structure of CR200 J power centralized electronic mutil unit(EMU)trailer body is based on the optimized design of the 25-type passenger train body.In order to make rational use of existing maintence resources and purse economic benefits,we carry out the static and modality analysis and fatigue failure of the vehicle body structure under different load conditions to predict the fatigue life of the structures.Firstly,the finite element model of the train body is established to fully Research and analyze the structure of the car body.According to the processing drawings,the three-dimensional actual model of the car body was established by using Solid Works three-dimensional design software,and the mesh was divided for the main structure of the built model car body,in order to ensure the accuracy of the analysis and improve the efficiency of the analysis,so as to obtain the finite element model of the car body.Secondly,according to the TB/T 1335-1996 and TB/T 1806-2006《Code for Strength Design and Test Evaluation of Railway Vehicles》requirements,we use the finite element software ANSYS Workbench(structural statics module)to analyze the strength and stiffness of the car body.In the calculation of the static strength of the car body,we determined the static strength load condition of the car body.It was concluded that the maximum value of the stress synthesis value at each measuring point under various load conditions was all less than the allowable stress of the material,which met the requirements of TB/T 1335-1996,so the static strength met the design requirements.The finite element software ANSYS is used here to anlalyze each mode of the vecle body,obtaining the natural frequency and amplitude nephogram of the structure under each mode.The stiffness of the car body is rechecked by modal analysis.The finally task is estimating the fatigue life of the vehicle body.Goodman fatigue limit diagram of each selected key part of the car body can be drawn,which provides data reference for the fatigue strength design of CR200 J power concentrated electronic mutil unit(EMU)trailer body steel structure according to the fatigue strength analysis of the car body.Comparing the fatigue life analysis method and the nomunal stress life method(S-N method),analysising the fatigue life of the vehicle body according to the S-Ncurve of the vehicle body material,by using the finite element software ANSYS Work Bench to estimate the fatigue life of the vehicle body.The calculation results provide a reference for the extension of thevehicle body repair process and the body structure scrap life,ensuring the safety of the structure in the production and operation stage,as well as fully and reasonably using resources to produce greater economic benefits. |
