Strength Calculation And Optimization Of 100% Low-floor Light Rail Vehicle Body

With China’s continuous leapfrog progress,China’s urbanization development is getting faster and faster,the forms and types of transportation are more and more diversified,followed by the problem of traffic congestion.In view of the current situation of national conditions,China needs to vigorously develop the rail transit industry,to provide cities with convenient and efficient rail transport.Among the many rail vehicles,100% low-floor light rail cars meet people’s travel needs,convenient for the public to travel also greatly reduce the urban traffic problems.Under such a premise,the design safety of 100% low-floor light rail car should be put forward high requirements,in the design phase of the vehicle needs to use finite element simulation analysis method to verify that the vehicle meets the requirements of the standard specification,which can greatly improve the efficiency of the design,and can continue to improve the vehicle in the design process,complete optimization and lightweight design.Firstly,the report explains the progress of 100% low-floor light rail vehicles and their main technologies,and the report also describes 100% low-floor light rail vehicles’ typical strength and features specifically.Then it introduces the definition of fatigue and the calculation process of evaluating fatigue intensity by the three methods of fatigue,namely IIW standard,BS7608 standard and main S-N curve method.Then,Hyper Mesh is used to carry out the geometric processing of 100% low-floor light rail vehicle body and mesh,after checking the finite element model mesh qualified,according to EN12663 standard to apply static strength conditions and fatigue condition load and constraints to 100% low-floor light rail vehicle body.According to the evaluation criteria of static strength,modality and fatigue intensity,the finite element model of 100% low-floor light rail vehicle body is calculated and analyzed,and the results obtained from simulation analysis can be seen that the modality,static strength and fatigue strength of the car body meet the prescribed requirements,and the stress size of the body is some margin compared to the yield limit of its material,which also lays the foundation for the lightweight optimization of the body structure.In the optimization stage of vehicle body lightweight,select 100% low-floor light rail vehicle body head car as the optimization object,determine the design variables,constraints,optimization targets and then use Optistruct to optimize the optimization object,optimize the body of 100% low-floor light rail car body for weight reduction to complete the lightweight design.Finally,this paper analyses the static strength and modal verification of the optimized body,and the optimized body meets the design standards,effectively realizing the lightweight goal of the body.