Hypersonic Morphing Vehicle Adaptive Active Disturbance Rejection and Anti-saturation Optimal Control
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摘要: 针对高超声速变形飞行器在变形过程中面临的模型不确定性、强外部扰动及执行器饱和问题,提出一种复合控制方法. 该方法集成预设时间扰动观测器、抗饱和辅助系统与自适应动态规划.首先, 设计基于模糊系统的预设时间扰动观测器, 实现对集总扰动的快速精确估计与前馈补偿; 其次, 引入动态抗饱和辅助变量, 在控制量饱和后调整收敛轨迹从而减轻饱和, 并在饱和结束后引导系统收敛, 保障系统闭环稳定性; 进一步, 构建包含跟踪误差与控制能耗的综合代价函数, 采用自适应动态规划在线逼近最优控制律, 通过输入到状态稳定性理论证明闭环系统所有信号一致最终有界. 仿真结果表明, 所提控制方法在强扰动与执行器饱和条件下, 能实现姿态跟踪误差的预设时间收敛, 相比传统的抗扰控制与纯数据驱动方法, 具备更快的动态响应、更高的跟踪精度与更优的饱和抑制能力.
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关键词:
- 高超声速变形飞行器 /
- 预设时间模糊扰动观测器 /
- 抗饱和控制 /
- 自适应动态规划
Abstract: This paper proposes a composite control method to solve the problems of model uncertainties, strong external disturbances, and actuator saturation faced by hypersonic morphing vehicles during morphing. The method integrates a prescribed-time disturbance observer, an anti-saturation auxiliary system, and adaptive dynamic programming. Firstly, a prescribed-time disturbance observer based on a fuzzy system is designed to achieve fast and accurate estimation of lumped disturbances and feedforward compensation; Secondly, dynamic anti-saturation auxiliary variables are introduced to adjust the convergence trajectory after control saturation, thereby mitigating saturation effects, and to guide the system to converge after saturation ends, ensuring the closed-loop stability of the system; Furthermore, a comprehensive cost function incorporating tracking error and control energy consumption is constructed. Adaptive dynamic programming is employed to approximate the optimal control law online, and the input-to-state stability theory is utilized to prove that all signals of the closed-loop system are uniformly ultimately bounded. Simulation results demonstrate that the proposed control method can achieve preset-time convergence of attitude tracking errors under strong disturbances and actuator saturation conditions. Compared with traditional disturbance rejection control and purely data-driven methods, it exhibits faster dynamic response, higher tracking accuracy, and superior saturation suppression capability. -
表 1 基于模糊系统的预设时间扰动观测器参数
Table 1 Parameters of prescribed-time disturbance observer based on fuzzy system
参数 符号 取值 预设时间 $ T_d $ 0.5 增益系数 $ k_1、k_2 $ 1.5 预设时间指数 $ r_1、r_3 $ 0.8 模糊系统学习率 $ \gamma_1、\gamma_2、\gamma_3 $ 0.01 参数衰减系数 $ \kappa $ 0.01 隶属函数中心范围 $ L $ 5 隶属函数宽度 $ \sigma_{ij} $ $ L/3 $ 表 2 预设时间抗饱和辅助系统参数
Table 2 Parameters of preset time anti-saturation auxiliary system
参数 符号 取值 预设时间 $ T_c $ 0.6 增益系数 $ a_c、b_c $ 1.2 收敛指数 $ r_c $ 0.7 表 3 预设性能控制律参数
Table 3 Parameters of preset performance control law
参数 符号 取值 滑模系数矩阵 $ c $ $ {\rm{diag}}\{2,\;2,\;2\} $ 滑模趋近增益矩阵 $ K_s $ $ {\rm{diag}}\{5,\;5,\;5\} $ 滑模指数 $ \alpha_0 $ 0.5 预设性能初始边界 $ \lambda_0 $ 5 预设性能稳态边界 $ \lambda_{\infty} $ 0.2 收敛速率 $ \beta_i $ 2 表 4 基于ADP的控制律参数
Table 4 Parameters of control law based on ADP
参数 符号 取值 Critic网络稳定参数 $ \alpha_{c1} $ 0.01 Critic网络学习率 $ \alpha_{c2} $ 0.01 折扣因子 $ \gamma $ 0.99 控制权重矩阵 $ R $ $ {\rm{diag}}\{1,\;1,\;1\} $ 状态权重矩阵 $ Q $ $ {\rm{diag}}\{5,\;5,\;5\} $ 缓冲区大小 $ M $ 100 表 5 对比方法控制器参数
Table 5 Parameters of comparison method controller
控制器 参数值 抗扰控制器 $ \xi = 0.75 $、$ \omega_o = 5 $、$ \omega_b = 8 $、 $ \beta_1 = 16 $、$ \beta_2 = 64 $ 强化学习控制器 $ \mu_a = 0.01 $、$ \mu_c = 0.001 $, $ \rho_a = 0.9 $、$ \rho_c = 0.9 $、 $ R = {\rm{diag}}\{1,\;1,\;1\} $、 $ Q = {\rm{diag}}\{5,\;5,\;5,\;1,\;1\} $ -
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