Multidisciplinary Design Optimization (MDO) techniques were successfully applied in sizing the wing boxes of the newly developed Fairchild Dornier regional jet family. A common finite element model for the whole aircraft was used for the static and aeroelastic optimization and analysis purposes. A detailed design model in the order of thousands of design variables was constructed. All relevant sizing r equirements for structural strength, aeroelastic behavior and manufacturing, resulting in over 800,000 constraints, were applied under all loading conditions. Many auxiliary tools for automating the process of preparing the huge amount of required input data, as well as the rapid assessment of results, were developed. Most of these tools were developed in close coordination with the MSC Software GmbH, since the MDO implementation process is centered around the optimization procedure in MSC.Nastran SOL 200. A new MSC.Nastran feature called External Server was utilized to integrate company specific wing buckling constraints into the Nastran optimization loop. An independent and comprehensive analysis of the conceived wing box's structural sizes confirmed the validity of the results.

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