近空间飞行器直接自适应变论域模糊滑模控制

考虑一类非线性不确定系统的直接自适应变论域模糊滑模控制问题。根据跟踪误差在线调整伸缩因子，使变论域模糊系统一致逼近被控对象中的非线性部分。通过引入鲁棒自适应控制器，消除了模糊建模误差，提高了系统的动态性能。给出了系统自适应参数的调整律，并基于Lyapunov理论证明了闭环系统一致稳定。最后，将该算法用于近空间飞行器(near space vehicle, NSV)姿态控制系统的设计，仿真结果表明了该算法的有效性。

Direct adaptive fuzzy sliding mode control with variable universe for near space vehicle

The design of variable universe direct adaptive fuzzy sliding mode control law to a class of uncertain nonlinear systems is considered. According to the tracking error, the contraction and expansion factors of variable universe fuzzy controller are tuned on line, so the nonlinear part is estimated by the fuzzy system. Robust controller is constructed to attenuate fuzzy approximation errors and enhance the whole system performance. The adjusting law of the adaptive parameters is given. By using Lyapunov theory, it is proven that the closed loop is uniformly stable. Finally, the flight control system of near space vehicle (NSV) under hypersonic condition is designed by using the proposed method. The results show the fine performance of the method.