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针对后掠角可变的变体飞行器,研究了一类变体飞行器的建模与控制问题。拟合气动参数与后掠角变化的关系,利用Jacobian线性化的方法得到线性变参数(LPV)模型。进一步建立一类平滑切换系统,同时引入切换序列受限的链式切换,推导了链式平滑切换系统在有限时间有界且具有鲁棒性能指标的充分条件。设计了一种平滑切换镇定控制器的求解算法,并给出控制增益的求解步骤。基于广义系统理论提出了保证变体飞行器姿态跟踪系统鲁棒稳定的充分条件,并通过算例验证所提方法有效性。
Aiming at the variant flight vehicle with variable sweep angle, the modeling and control of a variant flight vehicle are studied. The relationship between the aerodynamic parameters and the sweep variation is fitted, and the linear variable parameter (LPV) model is obtained by the Jacobian linearization method. Furthermore, a class of smooth switching system is established. At the same time, chaotic switching with limited switching sequences is introduced. The sufficient conditions for the chaotic system with robust performance are obtained. A solving algorithm of smooth switching stabilization controller is designed and the control gain is given. Based on the theory of generalized system, a sufficient condition for the robust stability of the attitude tracking system of the modified variant aircraft is proposed. The effectiveness of the proposed method is verified by an example.