Optimization Analysis of Multi-Response Sensitivity of EMU Roof
In order to improve the structural stiffness of EMU roof,and reduce the mass,and to study the influence of roof structure optimization on the vehicle bending stiffness,multi-objective dimensional optimization is carried out.In this paper,a submodel of the EMU roof is established based on the analysis results of vertical static load conditions and displacement interpolation technology.The compromise programming method is used to fit multiple subtargets into a multi-objective function,and a multi-response sensitivity analysis is proposed,so as to select the required components for optimization.The mass of the optimized roof submodel is reduced by 5.5%,the maximum vertical deformation is reduced by 8.6%,and the first-order vertical bending frequency is increased by 2.5%.Using the optimized slab-beam data,the vertical static load condition of the vehicle is recalculated.The results show that the bending stiffness of the vehicle is increased by 3.2%,which indicates that the stiffness of the vehicle can be improved by improving the stiffness performance of the roof,and provides technical reference for the roof optimization design of EMU.
万方数据
维普
