Multi-Fidelity Multidisciplinary Design Optimization of Metallic and Composite Regional and Business Jets

This paper presents an aircraft manufacturer’s methodology for the high-delity multidisciplinary design optimization of regional and business jets. The formulation of the multiobjective function and the hybrid multi-level optimization architecture are highlighted. The high-speed aerodynamics sub-space is analyzed with a Transonic Small Disturbance code whereas the low-speed sub-space is analyzed using a three-dimensional panel code and the Valarezo criteria. In addition, the multiple design load cases including manoeuvre and landing are presented along with the uid to structure load transfer scheme. Particular emphasis is also placed on the development, the industrial sizing and the structural suboptimization of a high-delity 3D FEM for composite and metallic wing structures. The validation of the structural sizing methodology is highlighted through examples and by comparison with typical aircraft wing structures. The inuence of low-speed aerodynamics on the nal design is emphasized and a comparative study between the multidisciplinary optimization of composite and metallic wings is presented. The methodology is applied to the optimization of a large business jet comprising winglets, rear-mounted engines and a T-tail conguration. The aircraft-level design optimization goal in this instance is to minimize a cost function for a xed range mission assuming a constant Maximum Take-O Weight.

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