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Fault Diagnosis Based on Controller Modification

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Advanced and Intelligent Computations in Diagnosis and Control

Part of the book series: Advances in Intelligent Systems and Computing ((AISC,volume 386))

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Abstract

Detection and isolation of parametric faults in closed-loop systems will be considered in this paper. A major problem is that a feedback controller will in general reduce the effects from variations in the systems including parametric faults on the controlled output from the system. Parametric faults can be detected and isolated using active methods, where an auxiliary input is applied. Using active methods for the diagnosis of parametric faults in closed-loop systems, the amplitude of the applied auxiliary input need to be increased to be able to detect and isolate the faults in a reasonable time. A negative effect of increasing the amplitude of the auxiliary input is that the disturbances in the external output will be increased and consequently reduce the closed-loop performance. This problem can be handled by using a modification of the feedback controller. Applying the YJBK-parameterization (after Youla, Jabr, Bongiorno and Kucera) for the controller, it is possible to modify the feedback controller with a minor effect on the closed-loop performance in the fault-free case and at the same time optimize the detection and isolation in a faulty case. Controller modification in connection with both fault detection and isolation will be discussed. Also passive fault diagnosis methods based on controller modification will be discussed.

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Acknowledgments

The author would like to thank Dr. Niels Kjølstad Poulsen, Technical University of Denmark, and Professor Jakob Stoustrup, Pacific Northwest National Laboratory, USA, for the joint work on the area of controller based fault diagnosis.

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Authors and Affiliations

  1. Department of Electrical Engineering, Automation and Control Technical University of Denmark, 2800 Kgs., Lyngby, Denmark

    Henrik Niemann

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  1. Henrik Niemann
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Correspondence to Henrik Niemann .

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Editors and Affiliations

  1. Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, Gdańsk, Poland

    Zdzisław Kowalczuk

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Niemann, H. (2016). Fault Diagnosis Based on Controller Modification. In: Kowalczuk, Z. (eds) Advanced and Intelligent Computations in Diagnosis and Control. Advances in Intelligent Systems and Computing, vol 386. Springer, Cham. https://doi.org/10.1007/978-3-319-23180-8_1

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  • DOI: https://doi.org/10.1007/978-3-319-23180-8_1

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-23179-2

  • Online ISBN: 978-3-319-23180-8

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