An on-line scheme to fault detection in adaptive control systems is proposed by introducing Kullback Discrimination Information (KDI) as a detection index. When a physical parameter change due to a failure has occurred in a system under adaptive control, the failure effect will hardly be visible in the output performance because of the adaptation mechanism. Such a parameter change is also difficult to detect by monitoring the regulator parameters, which are determined by a recursive identification based on the direct approach. Since the failure effect is reflected as a change in the predictor model used for the adaptive control design, the fault detection leads to a model discrimination problem. It has been shown that the KDI can be used as an effective distortion measure for the model discrimination and the index can be applied in a modified form to detect a fault on-line. Simulation studies on a second order damped oscillatory system have been carried out to demonstrate the efficiency of the method.
|Number of pages||6|
|Journal||IFAC Proceedings Series|
|Publication status||Published - 1989|
|Event||Eighth IFAC/IFORS Symposium on Identification and System Parameter Estimation 1988. Part 1 - Beijing, China|
Duration: Aug 27 1988 → Aug 31 1988
All Science Journal Classification (ASJC) codes