چكيده به لاتين
Foldable structures are one of the space structure’s categories that each pair of its elements are pined like a scissor. These structures are capable to deform from compact form to expanded one. It is difficult and time consuming to modeling the joints of these structures in analysis softwares, so in this proposal presents an analysis method due to easy analysis of these complex structures. The proposed method is based on the stiffness method of finite elements analysis in the way that a stiffness matrix is defined for each scissor element that can present a real model of scissor-link foldable structures. The other part of this proposal is allocated to optimal design of scissor-link foldable structures. In this part, by using meta-heuristic algorithms, it is tried to design structures that have optimum weight and volume in their folded position. To attain this purpose, the structures are modeled under imposed loads then by changing elements cross sections and topology of the structure, the optimum variables are accounted by considering optimization constrains like allowable displacement, maximum stress, and buckling. To get this purpose two multiobjective meta-heuristic algorithms, NSGAII, and MOCBO are used, and the results are compared.
