一类非线性时滞系统基于未知输入观测器的故障检测和分离

An Actuator Fault Isolation Strategy for a Class of Nonlinear Systemswith Time-Delay Using Adaptive Nonlinear Unknown Input Observer

研究了一类非线性时滞系统的故障分离问题.文中所讨论的故障是未知卡死故障,这就使得故障检测和估计问题变得更加的复杂.根据自适应未知输入观测器的设计理论和研究方法给出了针对此类系统的故障分离和估计的方法 .在满足Lipschitz条件下,提出了故障分离观测器和自适应诊断观测器.

The actuator fault isolation problem for a class of disturbance driven time delay nonlinear systems is investigated considering constant actuator faults. The proposed fault isolation approach relies on a bank of adaptive nonlinear unknown input observers. Based on the designed observers,a bank of residuals are defined correspondingly. The actuator fault can be isolated if only one residual approaching zero while the others do not. The faulty model with residual approaching zero identifies the faulty actuator.