Abstract: In this paper, in order to investigate the effect of sealing load on the structural strength of high-speed railway cockpit,the cockpit of one high-speed train was taken as research target. First, Hypermesh was used to establish the finite element model of cockpit and the structural strength of cockpit under sealing load was evaluated. Then in response to the strength evaluation results, OptiStruct was used to optimize the layup of composite materials which were used in the side wall of cockpit. The research result shows that the effect of sealing load causes a large displacement close to the large opening structure. At the seam time, by optimizing the layup of composite materials, not only can the structural displacement be ameliorated, but the structural lightweight effect can also be achieved. The structural has a 14.2% reduction in displacement and a 6.95% reduction in weight compared to the original design.

Key words: high-speed railway, composite materials, optimization, strength analysis, lightweight structure