Stringer-Concept Evaluations with Multidisciplinary Gradient Based Optimization of Composite Wing Structures

摘要

To further reduce CO2 emissions and increase the airplane performance the multidisciplinaryoptimization (MDO) approach is widely used. Especially the coupling ofaero performance and structural design is a promising approach to increase the overallperformance. From the structural point of view, details like sti ened panels areoften neglected to reduce the complexity for MDO purposes. Furthermore criteria likelocal buckling, global buckling and strength are seldom comprehensively considered.Composite structures increase the problem complexity by adding additional parameters,which are in general discrete, but they open the design space and inuence thestructural and aerodynamic interaction due to their highly oriented sti ness. Thesechallenges are faced with a highly parallel gradient based process and a precise wayto smear the stringer sti ness into the shell elements. This approach avoids buildingnew models with di erent meshes and non-trivial cut operation to generate discretestringers in the Finite-Element-Model. In conjunction with continuous and convexlamination parameters used to parametrize laminate, the full design space of laminatesand stringer is covered. Furthermore relevant design criteria like global andlocal buckling, strength and producibility constraints can be considered by analyticalcriteria. To illustrate the inuence of structural details on early stage wing design,di erent stringer designs are compared on a simpli ed wing box.