Structural Optimization Design On Equipment Cabin Of High-speed Train

Equipment cabin of high-speed train which is responsible for protecting equipments and decreasing aerodynamic drag,is an important component under train.If that inappropriate structural design of equipment cabin can lead to stress concentration of component is ignored,it could cause hidden danger in long range.So finite element analysis and optimization design for the equipment cabin is extremely important.In this paper,the equipment cabin of high-speed train is taken as the research object,topology optimization and shape optimization are implemented for bracket structure,bottom plate beam structure and camber beam on the basis of the stiffness and static strength analysis,the main content is as follow:Firstly,finite element model of equipment cabin is built by use of HyperMesh software based on 3D geometry model,and eight load cases is set up including aerodynamic pressure and acceleration vibration.Then static strength analysis of the structure is implemented by the use of Radioss.With the reference to analysis results of static strength,the safety factors of parts with large stress are checked,and a plan of optimization design for bracket,bottom plate beam and camber beam is proposed.Secondly,topology optimization is implemented for bracket based on substructure method.Optimization model is built up by filling optimized area with 3D solid element,and the topology optimization problem is solved by OptiStruct software.New bracket is designed according to topology optimization result,then stiffness and static strength of optimized bracket is checked.Then,layout optimization of bolts and topology optimization of shell structure are conducted for bottom plate beam based on substructure method.Layout optimization of bolts is achieved by ID topology optimization,then topology optimization on bottom plate beam is achieved by 2D topology optimization.New bottom plate beam is designed according to the topology optimization results,then stiffness and static strength of optimized bottom plate beam is checked.Lastly,shape optimization are conducted for camber beam based on substructure method.Free shape optimization for camber beam is conducted by selecting boundary nodes as object.New camber beam is designed according to shape optimization result,then stiffness and static strength of optimized camber beam is checked.