研究以非线性方程描述的飞机在操纵面发生损伤、卡死等故障时的自适应观测器诊断方法.通过引入有效性因子表征操纵导数变化的程度,将飞机操纵面故障诊断转化为具有未知参数的Lipschitz非线性系统的状态观测器设计问题.采用Lypunov方法,给出了观测器的结构形式和参数估计的自适应律,并在分析观测器渐近收敛的充分条件的基础上,给出了相关参数.数字仿真表明建议的自适应观测器能够快速且较准确地估计出有效因子的变化,验证了该方法的可行性.%The fault diagnosis method based on adaptive observer is employed to detect the failure of aircraft control surfaces,such as effectiveness loss or lock-in-place. By introducing effectiveness factors to characterize the changed degrees of the manipulation derivatives caused by failure, the fault diagnosis of aircraft control surfaces is transformed into the design of the state observer for the Lipschitz nonlinear system with unknown parameters. By applying Lypunov method, the structure of the observer and adaptive laws are given. Then by analyzing the sufficient condition for asymptotic convergence of the observer, the relevant parameters are given. The numerical simulation shows that the proposed adaptive observer can estimate the changes of the effectiveness factors quickly and accurately, verifying the feasibility of the method.
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