Simulation Analysis Of A-type Subway Aluminum Alloy Body Structure

With the rapid development of China’s economy,China is currently in the process of rapid urbanization,which poses great challenges to China’s existing urban transport infrastructure.In addition,the scale of urban construction in China is increasing day by day,under the influence of the large environment.Urban rail transit construction has become China’s first choice.Subway is a very important part of urban rail transit.The subway has the characteristics of safety,punctuality,speed,comfort,and environmental protection.It has a huge amount of traffic and is superior to any transportation on the ground.With the wide application of subway,the requirements for its structure and light weight are getting higher and higher.Therefore,it is necessary to carry out simulation analysis and optimization design of the vehicle body.This article first introduces the development history and present status quo of aluminum alloys at home and abroad,and forecasts the future development prospects.Through the comparison of several common subway cars and the current status of urban traffic development,combined with the needs of the current development of the environment,it is proposed that the A-type aluminum alloy subway car body is the most suitable subway car body for the development of urban rail transit in China..In addition,aiming at a domestic A-type aluminum alloy subway middle body,the finite element simulation model of the body is established on the basis of fully understanding the body structure and force characteristics of the body.The car body was subjected to finite element simulation analysis.According to the standard EN12663-2010,the simulation results of the vehicle body under various working conditions were verified.It can be seen that the strength,stiffness,and modality of the vehicle body structure all meet the specified requirements,although local occurrences occurred.The stress is concentrated,but the stress of various parts of the car body profile has a large margin compared with the yield strength of the material,which provides a basis for further optimization of the car body structure.Based on the structural characteristics of the aluminum alloy mid-car body,the chassis crossbeam of the body is optimized in size,and the static strength and stiffness of the body after optimization are calculated and verified to ensure that the body’s static strength and stiffness are consistent.At the same time,the dimensions of the undercarriage beam are improved and the quality of the car body is reduced.At the same time,based on the sensitivity analysis analysis method for the aluminum alloy mid-car chassis,the middle car body was further calculated and analyzed.The plates of each thickness of the undercarriage were selected as the design under the principle of "isostatic strength,equal stiffness".The variable body weight optimization design optimizes the body after optimization.After optimization,the vehicle body meets the requirements in terms of strength,stiffness and modality.The body weight is 0.14t,and the weight loss ratio is 8.4%.Effectively realize the goal of lightweight design of the vehicle body.