航天器点阵夹层圆柱壳构型多学科优化设计

Multi-disciplinary Optimization Design of Multi-layer Lattice Sandwich Cylindrical Shell in Spacecraft

针对航天器结构承载、密封及轻量化设计等苛刻设计要求,基于四面体结构的微观单胞构型,研究双层点阵夹层圆柱壳结构的单目标及多目标优化设计。优化模型以点阵夹层圆柱壳结构中的上中下板面的厚度、间距以及单胞内杆件的半径作为设计变量,在单目标优化中,以结构的质量为目标函数,获得合理的单胞分布;在多目标优化中,以最小热传导系数、最大化一阶屈曲载荷、屈服强度为目标进行优化,获得多学科优化问题的Pareto前沿。基于双层四面体点阵结构的多目标优化,给出了用于描述最小应力、最小质量、最小传热的最优解集。

The design requirements of spacecraft structure in loading,sealing,and lightweight are rather demanding.Based on the microcell configuration of the tetrahedron structure,the single-and multi-objective optimization design of the double-layer lattice sandwich cylindrical shell structures were studied.In the optimization model,the thickness,the spacing of the upper,middle and lower plates in the lattice sandwich cylindrical shell structure and the radius of the bar member inside the single cell were selected as the design variables.In the single-objective optimization,the mass of the structure was used as the objective function to obtain a reasonable unit cell distribution.In the multi-objective optimization,the minimum thermal coefficient,the maximum first-order buckling load,and the yield strength were optimized to obtain the Pareto front of the multidisciplinary optimization problem.Based on the multi-objective optimization of double tetrahedron lattice structure,the optimal solution set for describing minimum stress,minimum mass and minimum heat transfer were given.