Research On Topology Optimization Design Of High-speed Train Body Based On CRH EMU

High-speed trains are important for accelerating the development of the regional economy.Realizing the lightweighting of high-speed trains has always been a goal pursued by designers.According to the principle of the topology optimization of realizing reasonable distribution of regional material,uses OptiStruct density method and the control method of the minimum size for its lightweight design.Under the condition of ensuring that the stress,displacement and other constraints are met,the distribution of the train body cross-section ribs and the optimized structure of longitudinal body are obtained.The main contents of this paper are as follows:Firstly,The topology optimization theory and different topology optimization methods are discussed in detail.Different topological optimization methods have different characteristics and engineering application scope.According to the structure characteristics of high-speed train body,the topological optimization method of variable density method is determined.Secondly,due to the complexity of aluminum alloy extruded body section stiffeners,the traditional structural parameters and shape optimization methods are difficult to obtain the optimal structure.According to the requirements for each part of the train’s body in TB/T1335-1996 "specifications for the design and test appraisal of railway vehicle strength" and "interim provisions for the design and test appraisal of railway vehicle strength at 200km/h and above",the worst working condition is composed and the constraint conditions of each part in the actual operation of the train body are defined.Optistruct was used to optimize the topology of the reinforcement plate distribution of the train body section.Finally,according to the load distribution characterist ics of the existing train body in the longitudinal direction and the constraint setting of the train body design specification and the different load requirements in transverse,vertical and longitudinal directions,the topological optimization was used to optimize the train body in the longitudinal direction to find the distribution method of the best shape and position of the doors,windows and roof openings on the train body.Thus,the topological optimization method of realizing lightweight for the trai n body is studied.