Optimization Design On Installation Seats Of Frames For Intercity Multiple Units

As an important part of the railway vehicle,the bogie is subjected to a variety of static and dynamic loads from the body and wheel.As well as the working load of each component,its reliability directly affects the safety operation of the vehicle.If the strength of the bogie is not qualified,it will not only affect the service life of the train,but also pose a great threat to the safety of passengers.Therefore,it is necessary to evaluate the strength and stiffness of the bogie and optimize the structure.In order to meet the requirements of strength and stiffness,the lightweight design of the bogie is a further requirement for the optimal design of the bogie.In this paper,the welding frame of intercity EMU bogie is taken as the research object.First of all,taking into account the actual operating conditions of the steering frame is applied to the load,the steering rack Von.Mises under different conditions of stress and displacement is solved by using the Radioss module of HyperWorks software,analysis of intercity EMU bogie meets the requirements of strength and stiffness.Then,the fatigue load is applied to the bogie to solve the first principal stress of the bogie under different working conditions.The fatigue life of bogie is evaluated by BS standard,and the fatigue strength of bogie is analyzed.According to the analysis results of the static strength and fatigue life of the bogie,the topology optimization and size optimization design are carried out in order to ensure the fatigue strength of the mounting seat of the motor and the lifting seat of the gear box.In the process of topology optimization,the minimum component flexibility is taken as the objective,and the density of the elements in the design area is taken as the design variable.In order to meet the requirements of static strength,the OptiStruct software is used to optimize the topology of 3D structure.Based on the results of 3D topology optimization,a new 2D shell mesh model is established and the topology optimization is carried out.After checking the fatigue strength of the new structure,the optimal design of the new model is carried out based on the results of fatigue strength.In order to optimize the design,the minimum thickness of the component is taken as the objective and the thickness of the plate is the design variable.The static strength and fatigue strength of the new model are checked.The results show that the static strength and fatigue strength of the new structure meet the requirements.The topology optimization and size optimization,although the mounting seat of the motor and the lifting seat of the gear box of the quality has increased.However,the fatigue strength of the structure is improved,which ensures the safety of train operation.