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The Optimal Sweep Angle Design of a Morphing Firebee Drone in a Cruise Mission

This paper presents an algorithm to approximate aerodynamic coefficients and computes the optimal sweep angles of a variable-sweep Firebee drone that performs a cruise mission consequently. The aerodynamic coefficients of the morphing aircraft are computed via DATCOM. An approximation algorithm based on the sparse approximation principle is developed to fit the aerodynamic coefficients as concise and accurate functions of Mach, sweep angle, and angle of attack. The derived functions reveal the relations between the sweep angle and the drone's aerodynamic characteristics, which is used to formulate the optimal sweep angle design problem as an optimal control problem. The optimal sweep angle is derived by numerically solving this optimal control problem. Finally, two scenarios in a 3000 m cruise mission are considered to demonstrate the effectiveness of our proposed methods, while providing some instructions for further research.