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A fault detection method for a three-tank system.

Shields D.N., Du S.

Systems Science

2000

Vol. 26, nr 2

27-41

A fault detection observer is considered for a class of nonlinear models which consist of bilinear and polynomial nonlinearities up to degree N. The performance of the observer is assessed when applied to a three-tank system.

Development of Dynamic Neural Networks With Application to Observer-Based Fault Detection and Izolation

Marcu T., Mirea L., Frank P. M.

International Journal of Applied Mathematics and Computer Science

1999

Vol. 9, no 3

547-570

The paper suggests a neural-network approach to the design of robust fault diagnosis systems. The main emphasis is placed upon the development of neural observer schemes. They are built based on dynamic neural networks, i.e. dynamic multi-layer perceptrons with mixed structure. The goal is to achieve an adequate approximation of process outputs for known classes of the process behaviour. The obtained symptoms are then classified by means of static artificial nets. Appropriate decision mechanisms are designed for each type of observer schemes. An application to a laboratory process is included. It refers to component and instrument fault detection and isolation in a three-tank system.