夹层结构前机身有限元分析与优化设计

 选用二次等参夹层板壳单元进行结构分析,单元面板厚度及芯层高度作为优化设计变量。对复合材料面板,则每~铺层层数作为设计变量。对复合材料夹层结构前机身模拟试验件进行了有限元分析,在位移和尺寸约束下,对复合材料夹层结构前机身进行了优化设计,并获得满意结果。

FINITE ELEMENT ANALYSIS AND OPTIMUM DESIGN FOR THE FRONT-FUSELAGE WITH SANDWICH CONSTRUCTION

Finite element analysis and optimization subject to stress, displacement and side constraints for composite sandwich structures are mainly treated in this paper. Square isoparametric sandwich plate / shell elements are used to perform the structural analysis. The thicknesses of the faceplates and the depth of the core are taken as design variables in optimization process. The number of layers for each laminate is taken as design variables if the composite faceplates are used. A few widely applied approximation concepts, such as design variable linking, regionalization method and temporary deletion of passive constraints are employed to reduce the number of both design variables and contraints. The advanced hybrid approximation techniques combining with dual solutions are employed in optimization. The corresponding software is applied to the analysis of experimental model and to the optimum design for the composite sandwich front-fuselage, and satisfactory results are obtained.