Optimal design of dynamic characteristics for composite laminates and grid-structures of wing
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摘要: 以复合材料层合板各单层连续变化的铺层角度为设计变量, 在有限元软件中对层合板结构的基频进行优化分析, 在四边简支和固支两种不同的边界条件下, 结构的基频分别提高了4.9%和16.2%, 并对优化前后结构的静力失效强度进行了对比分析。随后将这种优化方法应用到某无人机复合材料机翼格栅结构中, 针对格栅结构蒙皮和肋板共计24个纤维铺层角度进行了优化设计, 使结构基频提高了10.6%, 同时结构的承载能力也有了一定程度的提高。Abstract: The optimization of first natural frequency of composite laminate was carried out in FEA software under Four-Edge-Simple-Support and Four-Edge-Fixing-Support boundary conditions, while the ply angles of every single layer of the laminate were confirmed as design variables. The result indicates that fundamental frequency under two boundary conditions is improved by 4.9% and 16.2%, respectively. The failure intensity of the structure before and after optimization was also analyzed comparatively. Then, the optimization method was applied in composite grid-structure aerofoil box of pilotless aircraft with the ply angles of 24 single layers of skin and ribs confirmed as design variables, and the results indicate that the fundamental frequency is improved by 10.6%. At the same time, the load capacity of the wing after optimization is improved to some degree.
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Keywords:
- composite material /
- grid structure /
- fiber ply angle /
- frequency optimization /
- strength analysis /
- aircraft wing
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