复杂系统子结构界面缝合方法

SUBSTRUCTURE TECHNIQUE IN THE ANALYSIS OF LARGE-SCALE STRUCTURE BASED ON INTERFACES SEAMING

把设计阶段已有的部件有限元模型作为子结构,可大幅度提高复杂系统计算效率,但会使子结构交界面上的节点网格不一致。为了满足界面位移协调条件,传统方法需要构造复杂的界面单元。该文提出一种子结构界面缝合方法,可在不需要界面单元的前提下实现子结构拼接,并且在合并子结构的同时,将界面位移凝聚到合成后的子结构边界上,从而提高了计算效率,也为设计阶段的多部门分工协作提供了便利。数值算例验证了所提方法的有效性。

One of methods to improve the computational efficient in the analysis of a large-scale structure is to take the existing finite element part models of the design stage as substructures. As a result, the meshes of these substructures are likely to be incompatible at their interfaces. In traditional methods, complex interface elements are necessary to ensure the deformation compatibility. We presented a new method of joining such substructures without recourse to the interface element, which facilitate the cooperation among departments involved in the structure design. With the presented method, displacements of nodes on the interface can be also eliminated from equilibrium equations during the procedure of joining two substructures, and consequently improves the computational efficient further. Finally, the presented method is verified by a numerical example.