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为了使飞机设计周期短、性能好、机体结构重量轻,在设计某大型飞机的地板纵向支撑长桁时,应用MSC.Patran/Nastran软件对其结构进行优化设计。采用成熟的尺寸优化方法,以厚度为优化变量,刚度指标为约束,结构轻量化为目标。通过尺寸优化计算后,得到了一种传力直接、重量较轻的地板纵向支撑长桁结构形式,并减重达29.53g,占原设计总重的42%,优化效果明显;促进了飞机研制进展。同时验证了尺寸优化方法的可行性,为以后的优化设计提供基础。
In order to make the aircraft design cycle is short, the performance is good, the structure of the body is light. When designing the long stringer longitudinally on the floor of a large aircraft, the structure should be optimized by MSC.Patran / Nastran software. Mature size optimization method is adopted. Thickness is the optimal variable, stiffness index is the constraint and the weight of the structure is the goal. After the size optimization calculation, a direct and light weight floor longitudinal support stringer structure was obtained and the weight was reduced to 29.53g, accounting for 42% of the total weight of the original design. The optimization effect was obvious. It promoted the development of the aircraft progress. At the same time, the feasibility of the size optimization method is verified, which provides the basis for the future optimization design.