Trajectory multiobjective optimization of hypersonic morphing aircraft based on variable sweep wing

In order to explore the application of morphing technology in hypersonic aircraft, a hypersonic morphing aircraft based on variable sweep wing is proposed, then the trajectory of glide phase is optimized through multiobjective optimization method. Firstly, the aerodynamic characteristics of different sweep morphing phases are offered, then the 3 degree of freedom dynamic model of free glide phase and the heat flux model of the leading edge of the wing are built. In the multiobjective optimization problem (MOP), the two optimization objectives are range of trajectory, the total heat of the leading edge of the wing, and the optimization variables include the Mach numbers when the aircraft is morphing, the angle of attack of different phases. MOP is solved by using the multiobjective evolutionary algorithm based on decomposition (MOEA/D). The numerical simulation results show that the proposed method can obtain the Pareto Front. Also, comparing to the non-morphing aircraft, the aircraft can achieve a larger range and a smaller total heat of the leading edge of the wing.