Wing-Box Weight Optimization Using Curvilinear Spars and Ribs (SpaRibs)

The aim of this research is to perform topology and sizing optimization of wing-box structures using curvilinear spars and ribs, referred to as SpaRibs in the following. To accomplish this, a new framework calledEBF3SSWingOpt is being developed at Virginia Polytechnic Institute and State University. The optimization framework includes two different methodologies: a one-step optimization methodology where topology and sizing optimization are carried out together and a two-step optimization methodology where topology and sizing optimization are carried out separately using different constraints and objective functions. A description of how the general framework is developed and applied for optimizing winglike structures is provided and the optimization-problem formulation is stated. Two practical design problems solved using EBF3SSWingOpt are presented: a rectangular wing box and a generic fighter wing. In both cases, the structure with the SpaRibs is lighter than the initial structure with straight spars and ribs.Moreover, the two-step optimization framework has proven to be better atfinding anoptimal solution than the one-step framework. Finally, different designs with comparable weights but different stress distributions, buckling properties, and dynamic behaviors were found.

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