This paper presents a new method to perform fault diagnosis for data-correlation based process monitoring. As alternative to the traditional contribution plot method, reconstruction-based contribution of fault detection indices is proposed. The monitored indices are SPE, T 2 and a combined index φ. The lack of diagnosability of traditional contributions is analyzed for the case of single sensor...

Operations, maintenance and reliability of wind turbines have received much attention over the years due to the rapid expansion of wind farms. This paper explores early fault diagnosis technique for a 5MW wind turbine system subjected to multiple faults, where genetic optimization algorithm is employed to make the residual sensitive to the faults, but robust against disturbances. The proposed t...

Multiple fault diagnosis is a challenging problem because the number of candidates grows exponentially in the number of faults. In addition, multiple faults in dynamic systems may be hard to detect, because they can mask or compensate each other’s effects. The multiple fault problem is important, since the single fault assumption can lead to incorrect or failed diagnoses when multiple faults oc...

Many model-based fault diagnosis approaches have been proposed so far and some of them are applied in industrial practice. But for modern complex processes, due to the variable nature of faults and model uncertainty, no single approach can diagnose all faults and meet different contradictory criteria. In this paper, the importance of integration of different fault diagnosis schemes in a common ...

Current design and assessment methods cannot ensure that software is error free and consequently fault tolerant techniques play an important role in safety critical systems to ensure reliable software behaviour. Unfortunately general guidelines for the implementation of software diagnostics are lacking. The aim of this work is to build on the previous research in software error detection and th...

A set of subgraphs C1, C2, . . . , Ck in a graph G is said to identify the vertices if the sets {j | v ∈ Cj} are nonempty for all the vertices v and no two are the same set. We consider the problem of minimizing k when the subgraphs Ci are required to be cycles. The motivation comes from fault diagnosis of multiprocessor systems. We study the cases when G is the locally twisted cube.

Vacuum circuit breaker becomes more and more complicated, integrated, high-speed and intellectualized. To insure vacuum circuit breaker in its good conditions, the function of fault diagnosis gets more important than before in the process of repairing. This paper is addressed a modelbased fault detection framework for vacuum circuit breaker by trip coil analysis. At first, the electromagnetic m...

This paper presents an approach for data-driven design of fault diagnosis system. The proposed fault diagnosis scheme consists of an adaptive residual generator and a bank of isolation observers, whose parameters are directly identified from the process data without identification of complete process model. To deal with normal variations in the process, the parameters of residual generator are ...