Research on Trajectory Planning Method for Variable Sweep Back Aircraft with No Fly Zone Margin

Abstract

For a high-speed variable sweep aircraft, the variation characteristics of lift coefficient and drag coefficient with angle of attack were analyzed. Based on the analyzed aerodynamic characteristics, an aerodynamic parameter calculation model was established with Mach number, angle of attack, and deformation rate as independent variables. A no fly zone avoidance strategy with a no fly zone margin is proposed to address the issue of some inter point trajectories not meeting the constraints of the no fly zone when using the pseudospectral method for trajectory design. Its effectiveness is verified in cylindrical and elliptical no fly zones. The trajectory optimization design of the deformable aircraft was carried out with three different optimal objectives: maximum range, maximum final speed, and minimum flight time. The results of on-demand deformation rate and fixed deformation rate were compared and analyzed. The simulation results showed that the deformable aircraft had better flight ability under on-demand deformation rate. At the same time, the addition of sweep angle as the control variable increased the redundancy of control variables, Improved the anti saturation ability of the servo.