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介绍一种基于自适应观测器的故障诊断方法,该方法通过构造自适应观测器获取反映系统故障的残差信息,并根据Lyapunov方法证明了自适应观测器的稳定性,然后采用需要样本较少的序列概率比方法进行故障决策。建立了某导弹电动舵机的数学模型,通过构造自适应观测器获取反映系统故障的残差信息,针对该系统出现的故障,利用序列概率比方法进行故障决策,仿真验证了本方法的有效性。
A fault diagnosis method based on adaptive observer is introduced in this paper. The residual error information reflecting system faults is obtained by constructing adaptive observer. The stability of adaptive observer is proved by Lyapunov method. Then, The sequence probability is better than the method to make fault decision. The mathematic model of a missile electro-dynamic servo is established. The residual error information reflecting the system fault is obtained by constructing an adaptive observer. According to the fault occurred in the system, the probability ratio method is used to make fault decision. The simulation results show the effectiveness of the method .