JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (5): 38-43.doi: 10.6040/j.issn.1672-3961.0.2017.182

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Effects of multiplicative actuator faults on the fault diagnosis performance in open-loop and closed-loop systems

LIU Yang   

  1. College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
  • Received:2017-02-10 Online:2017-10-20 Published:2017-02-10

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Abstract: The effects of multiplicative actuator faults on the fault diagnosis performance in both open-loop and closed-loop systems were investigated. Practical systems were usually subject to control inputs owing to the stability and robustness requirements. When multiplicative actuator faults were encountered, control signals could not be completely decoupled from the residual signals and the faults would unavoidably influence the fault diagnosis performance. The actuator faults were modeled for linear discrete systems and the Luenburger observer was used to generate the residual signals. By studying the one-step state transfer equation and the triangle inequality, the dynamics of the estimation error and residual was discussed and the conditions under which the open-loop and closed-loop residuals were bounded were established which were dependent on the amplitudes of the possible faults. Some numerical examples were provided to show the effectiveness of the proposed analysis for actuator faults with different amplitudes.

Key words: actuator, closed-loop system, multiplicative fault, fault detection, feedback control

CLC Number: 

  • TU457
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