Lightweight Research Based On The Structure Of Charge Cabinet Of Rail Vehicles

As the speed of trains continuing to increase,Lightweighting has become an important field for rail vehicle research.Based on the Optistruct structure optimization platform,the thesis carries on the morphology and topology optimization design of the rail vehicle charging cabinet structure.The modal welding fatigue utilization factor,the utilization rate of each material and the weak parts of the cabinet structure are obtained by analyzing the strength of the original structure of the charging cabinet and then the corresponding parts are optimized.The research results are shown as follows:(1)According to the three-dimensional model of the charging cabinet,the thesis simplifies the structure and selects the appropriate grid unit type to discretize the cabinet structure and adopts the mass unit to simulate the quality of the electrical components in the case.The constraints of the cabinet are determined and the finite element model of the cabinet is established.(2)According to the requirements of railway vehicle body structure standards,the cabinet structure is analyzed in five main working conditions and the dynamic and static mechanical performance parameters of the cabinet are evaluated according to the standards.The results show that the strength,mode,utilization factor of each material and weld fatigue strength of the cabinet structure meet the requirements of train operation standards under all operating conditions.(3)The weak parts of the cabinet structure are determined,the optimal design processes are formulated and a single-objective multi-working topology optimization mathematical mode is established by the results of the finite element analysis.In addition,the board,cabinet cover and electrical parts are carried out topological optimization of the mounting plate based on Optistruct optimization software.At the same time,the improved progressive structural optimization method is used to dealwith the checkerboard effect of the optimized finite element grid model.The reinforcement plate at the hanging foot,the mounting plate for the electrical device and the cabinet cover realize structural optimization.By comparing and analyzing the performance parameters of the cabinet structure before and after optimization,the rationality of the optimization is verified.After the final optimization,the first-order natural frequency of the cabinet cover is increased by 56.18%.The stress distribution of the cabinet structure is more balanced and the material utilization rate is higher and the purpose of lightweighting the cabinet is achieved after optimization.A preliminary discussion is carried out on the topology optimization technology of the structure and optimization design is used to the structural components of the cabinet according to improving progress optimization method advanced and the reliability of the method is verified in the thesis.The thesis has some reference value and engineering significance to structure optimization design of a vehicle charge cabinet.