Two different methods were proposed for high speed EMU body modal analysis research.The modal and mass sensitivity analysis was carried out with the thickness parameters of each vehicle body component as the design variables,and the influence rule of different component thickness on the first-order sag frequency of the vehicle body was studied.Eight components were selected as the final design variables,and the optimi-zation mathematical model was established for optimization.The response surface analysis was carried out by taking the stiffness parameter of the elastic element at the connection between the vehicle body and the main e-quipment under the vehicle body as the design variable,and the influence rule of the elastic element stiffness on the first-order vertical bending frequency of the vehicle body was studied,and the stiffness of the elastic el-ement was optimized.Both methods had achieved certain results.The optimization results showed that:the plate thickness optimization based on sensitivity analysis can improve the first-order vertical frequency by 4.13％;the stiffness optimization of the elastic components based on response surface analysis can improve the first-order vertical frequency by 28.05％,which was greater than the 10 Hz specified in the relevant stand-ards,and the optimization effect was obvious.
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