基于非线性自适应观测器的故障诊断

将自适应控制的思想和状态观测器方法相结合研究了一类非线性控制系统的故障诊断问题。针对一类满足Lipschitz条件的带有未知参数的非线性系统,提出了一种非线性自适应状态观测器的设计方法,并将其应用到控制系统的故障诊断中。通过设置未知故障向量的自适应调整律,保证了状态观测器的渐近稳定。数字仿真证明了该方法的有效性,系统渐近稳定,状态向量和故障向量的估计值均趋近于实际值。

Fault diagnosis based on the nonlinear adaptive observer

The problem of fault diagnosis is investigated for a class of nonlinear control systems by combining the idea of the nonlinear adaptive control and the method of the state observer.A designing scheme of the nonlinear adaptive state observer is proposed for a class of systems which satisfy the Lipschitz conditions and have unknown parameters.Then the proposed observer is applied to the fault diagnosis of a control system.The asymptotical stability of the state observer is guaranteed by setting the adaptive adjusting law of the unknown fault vector.The numerical simulation demonstrates the effectiveness of the proposed scheme.The system is asymptotically stable.The estimated values of the state vector and the fault vector both tend to their actual values.