Fault Detection and Diagnosis

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Fault Detection and Analysis
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Author Index
A B C D E F G H I
J K L M N O P Q R
S T U V W X Y Z

A New Controller Architecture for High Performance, Robust, and Fault Tolerant Control

Authors:

Kemin Zhou,

Volume: 1, Page 4120 Paper number 2091

Abstract:

In this paper, we propose a new feedback controller architecture. The distinguished feature of our new controller architecture is that the controller design for performance and robustness can be done separately which completely overcome the conflict between performance and robustness in the traditional feedback framework. The controller architecture includes two parts: one part for performance and the other part for robustness. The controller architecture works in such a way that the feedback control system will be solely controlled by the performance controller when there is no model uncertainties and external disturbances and the robustification controller will only be active when there is model uncertainties or external disturbances.

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Optimal Control Law for Fault Tolerant Control Systems

Authors:

Mufeed Mahmoud, Jin Jiang, Youmin Zhang,

Volume: 1, Page 4126 Paper number 1466

Abstract:

In this paper, an optimal control law is designed for Fault Tolerant Control Systems with Markovian Parameters(FTCSMP). The matrix maximum principle is used to minimize an equivalent deterministic cost function. Three scenarios are considered. The first assumes that both the failure process and the Fault Detection and Isolation (FDI) process are accessible for controller. In the second scenario, the controller is reconfigured based on the decisions of the FDI process and does not need an accessible failure process. The case where the FDI process itself is not able to give any decision due to physical malfunction or excessive computational time is the third scenario. In these scenarios, optimal control laws are developed to reduce the risk of losing system stability. A computational algorithm is constructed to calculate the optimal control law.

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Robust Reconfigurable Control for Parametric and Additive Faults with FDI Uncertainties

Authors:

Zhenyu Yang, Jakob Stoustrup,

Volume: 1, Page 4132 Paper number 1462

Abstract:

From the system recoverable point of view, this paper discusses robust reconfigurable control synthesis for LTI systems and a class of nonlinear control systems with parametric and additive faults as well as derivations generated by FDI algorithms. By following the model-matching strategy, an augmented optimal control problem is constructed based on the considered faulty and fictitious nominal systems, such that the robust control design techniques, such as H_(infinity) control and mu synthesis, can be employed for the reconfigurable control design.

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Observer-Based Fault Diagnosis For Structured Systems

Authors:

Christian Commault, Jean-Michel Dion, Olivier Sename, Reza Moteyian,

Volume: 1, Page 4138 Paper number 1083

Abstract:

We consider here the Fault Detection and Isolation (FDI) problem for linear systems with disturbances. We try to design a set of residuals through a bank of observers, in such a way that the transfer from the disturbances to the residuals is zero and the transfer from the faults to the residuals is diagonal. We deal with this problem when the system under consideration is structured, that is, the entries of the matrices which define the system are either fixed zeros or free parameters. To structured systems one can associate in a natural way a directed graph. We are then able to give a necessary and sufficient condition under which the FDI problem has a solution for almost any value of the free parameters. This condition is simply expressed in terms of particular paths in the associated graph.

CD001083.PDF (From Author)

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Fault Detection System Design Based On A New Trade-Off Strategy

Authors:

Steven X. Ding, Paul M. Frank, Eve L. Ding, Torsten Jeinsch,

Volume: 1, Page 4144 Paper number 1976

Abstract:

In this paper, problems related to the fault detection in dynamic systems with unknown inputs are studied. Instead of designing fault detection systems from the viewpoint of increasing the system robustness against unknown inputs and the sensitivity to the faults, an approach is proposed, which allows us to design fault detection systems based on a trade-off between the false alarm rate and the missed detection rate. A further study on the relationships between the approach proposed and the existing optimization approaches demonstrates that the approach proposed in this paper provides us not only with a unified solution to the existing approaches but also with the best solution among these approaches in view of minimizing the missed detection rate under a given false alarm rate.

CD001976.PDF (From Author)

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Diagnosis of an Uncertain Static System

Authors:

Olivier Adrot, Didier Maquin, José Ragot,

Volume: 1, Page 4150 Paper number 1487

Abstract:

This paper deals with an original fault detection and isolation method, allowing to take the structure and the range of model uncertainties into account. We focus on static and structured uncertain models, where each parameter uncertainty is described by a bounded variable. In order to de-couple residuals from unknown physical variables, a parity space approach is proposed, where the parity matrix depends on uncertain parameters. Because of this membership approach, called bounding approach, residuals represent a set of feasible behaviours and define therefore the normal operating domain of the studied physical system. To simplify its evaluation and work on a simple domain such as a parallelotope, residuals are linearised in the bounded variables and a reduction procedure is applied to decrease their complexity. Once the constraints defining this domain are determined, consistency tests for fault detection and isolation are built.

CD001487.PDF (From Author)

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A Time-Frequency Domain Fault Detection Approach Based On Parity Relation And Wavelet Transform

Authors:

Hao Ye, Ping Zhang, Steven X. Ding, Guizeng Wang,

Volume: 1, Page 4156 Paper number 1308

Abstract:

In this paper, problems related to the design of robust residual generators have been studied. The main objective of our study is to make use of the simple time domain design form of the parity relation based approach and the frequency domain analysis known by the H2- optimization approach, in order to improve the system performance without an essential increase in computation. We establish a relationship between the parity relation based and the H2-optimal residual generators and show that the optimal parity vector converges to the H2-optimal post-filter when the order of the parity vector tend to infinity. Making use of the fact that the H2-optimal post- filter is a narrow band filter and the well known time-frequency domain properties of Wavelet Transform, a time-frequency domain approach is developed, which allows us to design a residual generator based on Wavelet Transform. The significant property of such kind of residual generators is its simple form, low order and high performance. The main results are illustrated by examples.

CD001308.PDF (From Author)

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