FAULT ESTIMATION OBSERVER WITH UNMATCHED UNKNOWN INPUTS FOR LINEAR SYSTEMS

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HASHEMI MOJTABA; KAMALI EGOLY ALI; NARAGHI MAHYAR

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Journal: Modares Mechanical Engineering Year:2016 | Volume:16 | Issue:9 Page(s): 429-436

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Information Journal Paper

Title

FAULT ESTIMATION OBSERVER WITH UNMATCHED UNKNOWN INPUTS FOR LINEAR SYSTEMS

Author(s)

HASHEMI MOJTABA | KAMALI EGOLY ALI | NARAGHI MAHYAR | Issue Writer Certificate

Keywords

UNMATCHED UNKNOWN INPUTQ1

FAULT ESTIMATIONQ1

FAST ADAPTIVE OBSERVERQ1

Abstract

An algebraic method based on unknown input observer for FAULT ESTIMATION in linear time invariant system with unknown input is implementable if matching condition is satisfied. Matching condition limits practical application of these methods. In this article, a method is proposed for FAULT ESTIMATION which need not satisfy matching condition. Unlike classical methods, the provided method does not require auxiliary output for FAULT ESTIMATION. In the first step, the unknown input is divided in two parts: the matched and the UNMATCHED UNKNOWN INPUTs. Assuming that there exist a dynamic model for the unmatched part, new augmented system is constructed. The augmented system is revealed as a new system with matched unknown input. Then, the effect of matched unknown input is perfectly removed from observer estimation using the traditional unknown input decoupling strategy. In the next step, the full order observer is designed for the augmented system. A fast adaptive law is employed for the FAULT ESTIMATION. Lyapunov stability condition of state and FAULT ESTIMATION are derived by linear matrix inequality (LMI) criteria. The effectiveness of the proposed method is shown via numerical simulation on a flexible joint example.

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APA: Copy

HASHEMI, MOJTABA, KAMALI EGOLY, ALI, & NARAGHI, MAHYAR. (2016). FAULT ESTIMATION OBSERVER WITH UNMATCHED UNKNOWN INPUTS FOR LINEAR SYSTEMS. MODARES MECHANICAL ENGINEERING, 16(9), 429-436. SID. https://sid.ir/paper/179794/en

Vancouver: Copy

HASHEMI MOJTABA, KAMALI EGOLY ALI, NARAGHI MAHYAR. FAULT ESTIMATION OBSERVER WITH UNMATCHED UNKNOWN INPUTS FOR LINEAR SYSTEMS. MODARES MECHANICAL ENGINEERING[Internet]. 2016;16(9):429-436. Available from: https://sid.ir/paper/179794/en

IEEE: Copy

MOJTABA HASHEMI, ALI KAMALI EGOLY, and MAHYAR NARAGHI, “FAULT ESTIMATION OBSERVER WITH UNMATCHED UNKNOWN INPUTS FOR LINEAR SYSTEMS,” MODARES MECHANICAL ENGINEERING, vol. 16, no. 9, pp. 429–436, 2016, [Online]. Available: https://sid.ir/paper/179794/en

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