Jig-Shape Optimization of a Low-Boom Supersonic Aircraft

Pak, Chan-Gi

关键词: SHAPE OPTIMIZATION;    SONIC BOOMS;    LEAST SQUARES METHOD;    ROLL;    AERODYNAMIC BALANCE;    AIRCRAFT DESIGN;    WINGS;    SHAPES;    STRUCTURAL DESIGN;    ERRORS;    NUMERICAL ANALYSIS;    PITCH (INCLINATION);    YAW;    AEROELASTICITY;    ANGLE OF ATTACK;    DYNAMIC MODELS;   

RP-ID  :  AFRC-E-DAA-TN46771

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来源: NASA Technical Reports Server

【 摘 要 】

A simple approach for optimizing the jig-shape is proposed in this study. This simple approach is based on an unconstrained optimization problem and applied to a low-boom supersonic aircraft. In this study, the jig-shape optimization is performed using the two-step approach. First, starting design variables are computed using the least-squares surface fitting technique. Next, the jig-shape is further tuned using a numerical optimization procedure based on an in-house object-oriented optimization tool. During the numerical optimization procedure, a design jig-shape is determined by the baseline jig-shape and basis functions. A total of 12 symmetric mode shapes of the cruise-weight configuration, rigid pitch shape, rigid left and right stabilator rotation shapes, and a residual shape are selected as sixteen basis functions. After three optimization runs, the trim shape error distribution is improved, and the maximum trim shape error of 0.9844 inches of the starting configuration becomes 0.00367 inch by the end of the third optimization run.