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针对含有测量时滞的线性时滞系统,研究其执行器发生频率已知但幅值和初始相位未知的正弦故障时的故障诊断方法.提出了一种基于观测器的故障诊断方法,该方法首先通过建立故障的状态空间模型,将执行器故障的动态特性表示出来;然后利用一种测量时滞的无时滞转换方法,将时滞系统转换成无时滞系统;最后通过构造一种新颖的状态观测器,设计了不利用残差体现故障的故障诊断器,实现了系统执行器故障的在线诊断.仿真实例验证了该方法的可行性和有效性.
Aiming at the fault diagnosis of a linear system with time delay and a sinusoidal fault whose actuator frequency is known, but whose amplitude and initial phase are unknown, a fault diagnosis method based on observer is proposed. Firstly, By establishing a fault state-space model, the dynamic characteristics of the actuator failure are expressed. Then, a time-delay-free system with time delay is used to convert the time-delay system into a time-delay system. Finally, by constructing a novel State observer, a fault diagnosis device that does not reflect the fault using residuals is designed, and the on-line diagnosis of system actuator faults is realized. The simulation example proves the feasibility and effectiveness of the method.