To improve the stiffness of a gun's top carriage, an modified design was conducted by using the structural optimization based on the path of force transmission. The static stiffness and strength were calculated by using the finite element method, and the weak links in the original design were analyzed. The topology optimization was used to find the main path of force transmission and search for the best material distribution, and then the layout of stiffeners was modified. The detailed design was accomplished by u-sing size optimization, and the thicknesses of major plates were determined. The stiffness and strength of the improved top carriage were enhanced after optimization, the maximal displacement reduced by 32. 7% , the center variation of trunnion chamber declined by 52. 1% , and the maximal stress decreased by 20. 0% , while the mass only increased by 1.9 kg. The results show that the expected goal is a-chieved.%为解决某火炮上架刚度较差问题,利用基于传力路径下的结构优化设计方法,进行了上架改进设计.通过有限元静态刚强度计算,分析了原上架设计中的薄弱环节.运用拓扑优化方法找到结构的主传力路径,寻求最佳材料分布,修改了上架筋板布局.采用尺寸优化方法进行详细设计,确定了上架主要板件的厚度尺寸.对改进前后上架结构的刚强度进行了对比和分析,结果表明改进设计的上架刚度有较大幅度提高,最大位移减小了32.7％,左右耳轴室中心变位差减小了52.1％,且最大应力降低20.0％,而结构质量仅增加了1.9 kg,达到了改进设计目标.
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