| With the continuous acceleration of China's urbanization process,the beijing-tianjin-hebei region,the Yangtze river delta and the pearl river delta economic circle have become quite large,and the population pressure is increasing day by day.People's demand for convenient transportation promotes the rapid development of the rail transit industry.High-speed trains,bullet trains,intercity trains,subways,light rails and other railway trains of different speeds have built a huge rail transit network in China,providing safe,punctual,fast and convenient transportation services for busy people in cities.Urban development largely depends on the transportation speed of the city.When the urban development reaches a certain scale,the subway will undoubtedly become the first choice for millions of urban people to travel.As the most critical component of subway vehicles,the vehicle body structure has become the focus of urban rail transit industry research.After years of development,the body structure of metro vehicles can be divided into several systems,such as stainless steel spot welding car,steel-aluminum hybrid car and aluminum alloy car body.On the premise of maintaining the same transportation speed,each city combines its own conditions to ensure safety.At the same time,lightweight car body undoubtedly becomes the first choice.It can not only save more energy and enhance more capacity,but also reduce noise and vibration.Guangzhou metro line 13 is the country's first 100 km/h 8 marshaled aluminum alloy subway A car,its maximum to meet the needs of large passenger flow,but A subway car body structure particularity also put forward higher requirements for car body strength,welding structure weld fatigue,stability and so on.In this paper,Guangzhou metro line 13 bus body is taken as the research object,and the aluminum alloy car body structure is simulated and studied from static strength,modal,fatigue,collision and other aspects,and the related performance is evaluated.The main contents are as follows:1.The development status of the process performance of aluminum alloy vehicle body is introduced,the fatigue strength assessment status of welded structure is summarized,the fatigue strength related theories are studied,and the main s-n curve method,the latest intermational fatigue life prediction theory based on American ASME standard,is given;2.According to the geometric model and relevant welding drawings,create the finite element model of Guangzhou metro line 13 bus body.This paper introduces the evaluation criteria for the rigidity and static strength of subway car body,and sets up 20 load conditions according to the EN12663-2010 standard and the design requirements of car body,and carries out the simulation calculation for the rigidity and static strength of the car body.According to GB/T 7928-2003 and EN12663-2000,the stiffness and static strength of the car body were analyzed and evaluated respectively.The position of the patch for static strength test was introduced,and a comparative study was conducted based on static strength test data and finite element simulation results.3.Analyze the unconstrained free imodes of the steel structure of the head car body under the condition of preparation and maximum overwork,and study the relationship between the body mode and the body mass and its distribution according to the comprehensive displacement cloud diagram and the vibration mode frequency of each order of the car body under the three states;4.Study the fatigue load conditions in EN12663-2010 standard,select the American ASME-2007 standard,and use the Fe-weld software based on the main s-n curve method to evaluate and predict the fatigue life of key welding seams for Guangzhou metro line 13 head car body;5.Create the initial finite element model for collision simulation of the car body,analyze the deformation,energy and impact force of the main energy-absorbing structure of the car body chassis when the car body hits the rigid wall at a speed of 25 km/h,and optimize and improve the relevant energy-absorbing structure according to the analysis results,so as to improve the collision resistance of the car body... |
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