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Two-level optimization on structural layout and component size of flying wing aircraft

ZHANG Zhongzhen,YU Xiongqing,HU Tianyuan(National Defense Key Lab.of Fundamental Sci.for Advanced Design Tech.of Flight Vehicle,Nanjing Univ.of Aeronautics & Astronautics,Nanjing 210016,China)  
To optimize the structure of flying wing aircraft,a tow-level optimization method is proposed considering the optimization of structural layout and component size at the same time.In the first level,the number and position of wing beam are taken as the constraint,the lightest weight is taken as the optimization object,and the structural layout is optimized by multi-island genetic algorithm of iSIGHT.The second level is based on the structural layout obtained by the first level,the best size of every component is confirmed while the constraint of stress and displacement is satisfied,and so the lightest structure is obtained.In second level,according to the profile model of CAD and the fixed parameters of the structural layout,the finite element mode of an aircraft model is automatically generated using PCL of MSC Patran,the structural size of the whole aircraft is optimized using MSC Nastran,and the optimization results are returned to the first level.The optimal optimization deign solution of the structural layout and component size is achieved by the iteration between the first level and the second level.The optimization of the two levels are integrated by iSIGHT.The examples indicate that the method provides an effective solution for the collaborative optimization of structural layout and component size for flying wing aircraft.
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