高超声速飞行器输入受限模糊反演控制

针对吸气式高超声速飞行器控制中存在的执行机构受限问题,提出一种模糊反演控制设计策略。设计一种新的辅助系统分别对跟踪误差和控制律进行补偿,在物理执行机构受限时能够同时保证闭环系统及跟踪误差的有界性。在反演控制的设计框架下,引入模糊控制器逼近模型中的不确定项,提高控制系统的鲁棒性。为防止出现传统反演方法中存在的“微分膨胀”问题,引入滑模微分器对虚拟导数进行求解。最后,通过实例仿真验证所设计控制策略的有效性。

Fuzzy back-stepping control of a flexible air-breathing hypersonic vehicle with input constraints

The design of a fuzzy back-stepping control of a flexible air-breathing hypersonic vehicle with actuator constraints is discussed. Novel auxiliary systems are developed to compensate both the tracking errors and desired control laws, which guarantees the boundedness of the closed-loop system and tracking errors even when the physical limitations are on actuators. The back-stepping controller with fuzzy logic systems is applied to approximate the lumped uncertainty of the model. The sliding mode differentiator is introduced to obtain the derivatives of virtual control laws, which avoids the explosion of differentiation terms in the traditional back-stepping control. Finally, reference trajectory tracking simulation shows the effectiveness of the proposed method.