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放宽静稳定性可以解决高超声速飞行器在高超声速飞行时正稳定裕度过大的问题,但是会造成亚声速飞行阶段飞行器稳定性下降。针对高超声速飞行器在亚声速飞行时稳定性不足的问题,采用经典反馈控制和LQ最优控制方法,设计了2种不同的增稳控制系统并应用于放宽静稳定后的高超声速飞行器。数值仿真结果表明,LQ最优控制增稳系统较经典反馈增稳控制系统具有更好的动态增稳效果和更强的鲁棒性能,因此LQ最优控制下的增稳系统拥有更好的增稳效果和更理想的抗鲁棒特性。
The relaxation of the static stability can solve the problem that the hypersonic vehicle is getting over the stability margin at the hypersonic flight, but it will cause the stability of the aircraft to decline during the subsonic flight. Aiming at the lack of stability of hypersonic vehicles during subsonic flight, two kinds of stabilization control systems are designed by classical feedback control and LQ optimal control method, and applied to relax the hypersonic vehicle after static stability. The numerical simulation results show that the LQ optimal control system has better dynamic stabilizing effect and stronger robust performance than the classical feedback augmented control system. Therefore, the stabilization system under LQ optimal control has a better performance Stable effect and more ideal anti-robustness.