摘要
首先,针对存在外部干扰和输入饱和的通用式高超声速飞行器的纵向动态模型,提出一种基于滑模干扰观测器的抗饱和滑模控制器。该滑模控制器采用非线性趋近律,在保证系统快速、稳定跟踪指令的同时,能够消除传统滑模控制中的抖振现象,并针对执行器饱和问题,加入抗饱和补偿器,以提高系统的稳定性。其次,对于系统中存在的干扰和不确定性,提出一种滑模干扰观测器,用以准确估计系统中存在的等效干扰,并将该观测器对干扰的估计值应用于滑模控制器中进行补偿,以消除干扰。再次,利用Lyapunov理论对所提出的基于滑模干扰观测器的抗饱和滑模控制器进行稳定性分析。最后,对高超声速飞行器的巡航状态进行仿真。仿真结果表明,所提方法能够有效提高系统的稳定性和抗干扰性,具有一定的实际应用价值。
Firstly, aimed at the longitudinal dynamics model of generic hypersonic flight vehicle in the presence of external disturbances and input saturation, an anti-windup sliding mode controller based on sliding mode disturbance observer is proposed. The sliding mode controller employs nonlinear reaching law, which makes the system track reference command fast and steadily; at the same time it eliminates the chattering phenomenon existing in the traditional sliding mode control, adds saturation compensator according to the problem of actuator saturation to improve the stability for the system. Secondly, a sliding mode disturbance observer is proposed to overcome the disturbances and uncertainties of the system, which can exactly estimate the equivalent disturbances added in the system. The estimated value evaluated by the observer is applied to the sliding mode controller as compensation to achieve the goal of eliminating disturbance. Thirdly, the stability of the proposed anti-windup sliding mode controller based on sliding mode disturbance observer is analyzed by means of Lyapunov theory. Finally, the simulation is conducted for cruise flight condition of hypersonic flight vehicle. Simulation results show that the suggested method can improve the stability and disturbance rejection performance for the system effectively, which has certain actual application value.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2015年第6期2027-2036,共10页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(91216304)~~
关键词
高超声速飞行器
干扰观测器
趋近律
饱和
滑模控制
干扰抑制
hypersonic flight vehicle
disturbance observer
reaching law
saturation
sliding mode contro
disturbance rejection
