Nonlinear Response Structural Optimization of a Joined Wing Using Equivalent Loads

Abstract

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Post-critical analysis of highly deformable Joined Wings: The concept of snap-divergence as a characterization of the instability

“…Typical joined-wing configurations (Wolkovitch, 1986;Chambers, 2005) are characterized by significant structural geometric nonlinearities (Blair et al, 2005;Kim et al, 2008;Liu et al, 2010). As a consequence, preliminary design complexity is increased (Blair et al, 2005): existing procedures successfully adopted by the aerospace industry rely mainly on linear tools not able to correctly reproduce these effects.…”

“…What has proven to be very effective in the past for classical cantilevered configurations, then, cannot (Kim et al, 2008) be directly translated into procedures that have the same degree of computational efficiency and accuracy, when Joined Wings are considered (Weisshaar and Lee, 2002).…”

Nonlinear Aeroelastic Scaling of a Joined Wing Aircraft

“…The process is iterated until convergence. The ESL methodology was originally developed and applied to the joinedwing application by Lee et al 10 Kim et al 11 showed that ESL optimization produced a better design than a fully stressed design methodology for a detailed joined wing case. Kim et al 12 later showed that the ESL methodology produced the same joined-wing design as a conventional gradient based optimization, but at a much lower cost.…”

Structural Optimization of Box Wing Aircraft

“…There is therefore a need to develop a method of the structure optimization taking structural nonlinearity into account. The NROEL method [4,5,6] could be an example. This is a modified gradient method, which transforms the nonlinear problem to the linear one and then solves it.…”