| Rail train,as a new type of transportation,greatly meets the needs of people flow and goods trade,accelerates the contact and exchange between different civilizations,promotes the process of global integration,and makes great historical contributions to the development of the world.With the upgrading of train technology,the speed of train operation is faster,and the stability and comfort are constantly improved.In train technology,lightweight design is an important and eternal research direction,which is of great significance to reduce energy use and global carbon emissions.In this paper,the finite element model of a high-speed train body in our country is established firstly.Referring to EN12663 standard and TB1335-96 standard,the common train operation conditions are selected and the boundary conditions are set,and the results meet the strength and stiffness requirements specified in the standard;referring to 95j01-L "strength and dynamic performance specification for high speed power train",the modal results meet the requirements of the EMU body The first bending frequency is higher than 14 Hz.According to the results of static strength analysis,the stress of each part of the EMU body is far less than the allowable stress of the material,and the material is not fully utilized,so the utilization rate of the material can be increased through structural optimization.Based on Optistruct software and sub model analysis method,the middle part of the EMU body is selected as the design domain,the boundary position of the sub model is determined,and the displacement information of the boundary nodes is generated.The effectiveness of the sub model is verified by simulation calculation.Based on the topology optimization method,the sub model is optimized to obtain the new cross-section aluminum alloy profile distribution.Based on the cross-section conceptual design,the finite element model of the new concept EMU body is established.Under the same working conditions as the original car,the thickness of 12 components such as the EMU body skin and stiffeners is taken as the design variables,and the calculated stress of 12 components is less than the material yield limit as the constraint condition.The optimization objective is to minimize the mass of the components.Then the size optimization design of the concept car is carried out.The static strength,stiffness and modal analysis results of the optimized concept car meet the requirements of relevant standards or specifications,and the concept car achieves the purpose of lightweight. |
