Effect of Flutter on the Multidisciplinary Design Optimization of Truss-Braced-Wing Aircraft

This study highlights the effects of a flutter constraint on the multidisciplinary design optimization (MDO) of a truss-braced-wing transport aircraft for both medium-range and long-range missions. Previous MDO studies for both of these missions were performed without considering the effect of flutter. Hence, the flutter constraint has now been added to the other design constraints in this MDO study. Minimizing the takeoff gross weight and the fuel burn are selected as the objective functions. The results show that, for the medium-range mission, the flutter constraint applied at 1.15 times the dive speed imposes a 1.5% penalty on the takeoff weight and a 5% penalty on the fuel consumption while minimizing these two objective functions. The penalties imposed on the minimum-takeoff-gross-weight and minimum-fuel-burn designs for the long-range mission due to the similar constraint are 3.5 and 7.5%, respectively. Importantly, the resulting truss-braced-wing designs are still superior to equivalent cantilever ...

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