一类具有未知参变量的非线性系统的鲁棒故障诊断(英文)

Robust Fault Diagnosis for a Class of Nonlinear Systems with Unknown Parameters

中文关键词  故障诊断及隔离  非线性系统  自适应观测器  未知参变量

英文关键词  fault detection and isolation  nonlinear systems  adaptive observer  unknown parameters

中文摘要

      讨论了一类含有状态和输入未知参变量的非线性系统的故障诊断问题. 在满足一些几何条件的情况下, 该类系统可化成两类不同的子系统. 对于其中一类不受故障影响的子系统, 得到了其非线性自适应观测器及参数自适应律的设计; 另一类受故障影响的子系统的状态是可测的, 给出了该类子系统的基于模型监测和故障诊断的观测方案. 然后, 给出了用于验证本文所提方案的数字示例.

英文摘要

      The fault diagnosis problem for a class of nonlinear systems with unknown parameters in both states and inputs is discussed. Under some geometric conditions, the systems are transformed into two different subsystems. One is not affected by actuator faults, so the nonlinear adaptive observer and the parameter adaptive law can be designed. The other whose states can be measured is affected by the faults. The observation scheme is then used for model based monitoring and fault diagnosis. Selection of threshold is investigated. Finally, a numerical example is used to illustrate the applicability of the proposed method.