Performance Analysis And Lightweight Design Of High-speed Train Bogie Frame

With the development of my country’s high-speed railways and the strategic layout of the "eight vertical and eight horizontal" railways,my country’s high-speed trains have also developed rapidly.Among them,the lightweight research of bogie frames has become the focus of attention of many railway companies and researchers.With the development of optimization technology,domestic and foreign researchers are also increasingly sophisticated in the research on the structural optimization of the bogie frame.However,the layout of the ribs inside the side beams of the bogie frame still needs to rely on the experience design of relevant researchers,which is difficult to guarantee.Its rationality and scientificity.Therefore,it is necessary to perform performance analysis first,and based on the results of the performance analysis,rationally optimize the structure of the bogie frame based on multi-objective optimization technology to make the bogie frame as light as possible while meeting the required performance.In this paper,a certain type of high-speed train bogie frame is selected as the research object,and the following work is carried out for its structural lightweight problem:(1)Simplify the structure of the bogie frame according to the design requirements and establish a finite element model based on plate and shell elements.In the process of establishing the finite element model,the connection method between the plate and shell elements adopts the common node connection method,and the connection method between the body and shell elements mainly adopts the composite element and RBE2 rigid connection.According to the relevant standards of my country’s railway,the simulation test conditions of the frame are determined and the static strength analysis and modal analysis are carried out.The results show that the static strength and modal performance meet the design requirements.(2)According to the above performance analysis results,select several working conditions with greater stress and the first three-order modal vibration frequencies.Based on the variable-density topology optimization method,perform static single-case stiffness topology optimization and low-order natural frequencies respectively.Topology optimization,to get the rib structure under different working conditions and modes.Finally,based on the compromise planning method,the multi-objective function problem is integrated into a single objective function for topology optimization,and the internal ribs of the side beams of the bogie frame are rearranged,and the quality of the side beam ribs is reduced to improve the performance of the bogie frame.Stiffness and modal vibration frequency.(3)Based on the topologically optimized bogie frame model,the welded steel plates are optimized for multi-objective size.The thickness of the welded steel plates at the above cover plate,lower cover plate and other parts are taken as design variables,and the variation range of each design variable is determined based on sensitivity analysis.According to the design process,the Kriging proxy model was constructed,and the Pareto optimal solution set was obtained through genetic algorithm optimization calculation,and then the optimal solution was selected according to the design requirements.After optimization,the quality was reduced by 27.8%.Finally,the static strength and modal check and inspection are carried out,and they all meet the design requirements of relevant standards,which provide a reference for the optimization design of other types of structures in China.