Study On Simulation And Experiment Of MP Car Body Of B-type Aluminium Alloy Carbody Performance

For the past few years,with the acceleration of China’s urbanization process,traffic congestion has become more and more serious,and being the bottleneck of the development of China’s major cities.Therefore,it is urgent to develop public transportation and relieve traffic congestion.Since the beginning of the 13 th five-year plan,more than 100 cities in China have planned the construction of urban rail transit projects,forming a situation that 100 cities develop urban rail transit at the same time.The opinions on further strengthening the planning and construction management of urban rail transit issued by the general office of the state council in 2018 shows that urban rail transit is the theme of public transport development in China at the present stage,and as the urban rail vehicles with the largest passenger capacity,subway vehicles have been widely used in various cities.Aluminum alloy has been widely used in the body structure of urban rail vehicles due to its advantages such as high strength,good processing performance,strong corrosion resistance and easy extrusion.As the main bearing structure in the operation of subway vehicles,the safety performance of the vehicle body is very important,which directly affects the normal operation of trains and the safety of passengers.In this paper,the B-type Aluminium Alloy Carbody of subway vehicle newly developed in a certain city is taken as the research object,based on the finite element method,the finite element simulation software was used to build the car body model and analyze the performance of the car body.The details are as follows:1.On the basis of determining the main parameters and basic structure of the body,the aluminum alloy body is designed detailedly in structure.The finite element simulation model of the car body was established with the Hyper Mesh software,and 31 load conditions for static strength analysis were determined according to the standards of《EN12663—2010》and operating line conditions.The aluminum alloy car body structure was simulated with ANSYS software.According to the calculation results,the strength,stiffness,modal and fatigue of the car body structure all meet the specified requirements,which provides a foundation for the further size optimization of the car body structure.2.The static strength test,of aluminum alloy car body structure were based on the《EN12663-2010》standard,and the test results and simulation results were analyzed,test values and calculated values,shows that the finite element modeling method based on the principle of equivalent stiffness can reflect the real force of the car body structure and the load-bearing characteristics.3.Based on the analysis theory of modal and buckling stability,the modal analysis and stability analysis of aluminum alloy car body structure are carried out to determine its natural vibration frequency and natural vibration mode as well as the parts of the car body structure prone to instability.4.The S-N curve of each evaluation position was determined according to the《 IIW-2008》standard,the fatigue load applied on the aluminum alloy car body was determined according to the en12663-2010 standard,and the fatigue strength of the car body structure was analyzed based on the nominal stress method.5.In accordance with the law GB5599-1985 standard,the aluminum alloy car-body nonlinear dynamic model is set up,from the vehicle movement stability,operation stability and curve simulation calculation by the security point of view,the relative parameters of vehicle system optimization analysis,and the stability,operation stability and the safety of the curve by simulation prediction.