COLLABORATIVE MULTI-LEVEL MDO PROCESS DEVELOPMENT AND APPLICATION TO LONG-RANGE TRANSPORT AIRCRAFT

摘要

DLR’s work on developing a distributedcollaborative MDO environment is presented. Amulti-level approach combining high-fidelityMDA for aerodynamics and structures withconceptual aircraft design methods is employed.Configuration-specific critical loads areevaluated and used for sizing the structure. Agradient-free optimization algorithm is used tooptimize the fuel burn of a generic long-rangewide-body transport aircraft configuration with9 shape parameters. First results show a trulymultidisciplinary improvement of the modifieddesign. The result of a gradient-free highfidelityMDO with preselected load cases andfive shape parameters is also presented,comparing a full mission analysis with resultsfor the Breguet range equation. Finally, agradient-based high-fidelity aero-structuraloptimization subject to 7 pre-selected load casesis performed for a wing-body configuration thatis parametrized by 360 freeform deformationdesign variables for the aerodynamic shape and348 thickness design variables for the internalstructure, resulting in a 6% increase in theobjective function.