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由于飞行器模型的强非线性,各种建模不确定性以及飞行环境的复杂性,高超声速飞行器控制成为一个研究难点.针对某类具有参数不确定性的非线性系统,提出了一种反馈线性化与自适应估计相结合的方法,对非线性系统的输入输出动态应用反馈线性化处理以得到拟线性模型,并设计反馈控制律;对不确定参数采用自适应在线估计,利用Lyapunov方法分析稳定性;针对选择不同输出的情况,对如何消除内动态进行了讨论.为了验证该方法的可行性,将其应用于某高超声速飞行器巡航段纵向非线性模型,对速度和高度通道进行跟踪控制仿真,由于飞行器和大气环境存在建模不确定性,利用自适应控制对不确定参数进行在线估计.仿真结果显示该方法能够快速收敛,并且具有良好的在线自适应能力.
Due to the strong nonlinearity of the aircraft model, various modeling uncertainties and the complexity of the flight environment, hypersonic vehicle control becomes a research challenge.Aiming at a class of nonlinear systems with parameter uncertainty, a feedback linear And adaptive estimation. The feedback linearization is applied dynamically to the input and output of the nonlinear system to obtain the quasi-linear model and to design the feedback control law. An adaptive on-line estimation is applied to the uncertain parameters, and the stability is analyzed by Lyapunov method In order to verify the feasibility of this method, this method is applied to a longitudinal nonlinear model of a hypersonic vehicle cruise section, and the simulation of tracking and controlling of the velocity and altitude channels is carried out. Due to the modeling uncertainty of the aircraft and the atmospheric environment, an adaptive control method is used to estimate the uncertain parameters online. The simulation results show that the proposed method can converge quickly and has good online self-adaptability.