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针对一类多输入多输出非线性不确定系统,提出了基于模糊干扰观测器(FDO)的轨迹线性化控制(TLC)方法并应用于空天飞行器(ASV)飞行控制系统设计。利用模糊系统具有以任意精度逼近非线性函数的能力设计FDO对未知干扰和不确定进行估计,并通过鲁棒控制项来提高系统的性能。采用Lyapunov方法本文证明了闭环系统跟踪误差和干扰观测误差一致最终有界。最后利用所提出的控制方案设计了ASV飞行控制系统,仿真结果表明了控制方案的有效性和鲁棒性。
Aiming at a class of multi-input multi-output nonlinear uncertain systems, a trajectory linearization control (TLC) method based on fuzzy disturbance observer (FDO) is proposed and applied to the design of flight control system of spacecraft (ASV). The FDO is used to estimate the unknown interference and uncertainty by using the fuzzy system with the ability of approximating nonlinear functions with arbitrary precision. The robust performance of the system is improved by using robust control terms. Using Lyapunov method, this paper proves that the closed-loop tracking errors and the observed errors are consistent and finally bounded. Finally, the ASV flight control system is designed by using the proposed control scheme. The simulation results show the effectiveness and robustness of the control scheme.