NDLI: Unbiased inversion-based fault estimation of systems with non-minimum phase fault-to-output dynamics

Content Provider	IET Digital Library
Author	Naderi, Esmaeil Khorasani, Khashayar
Abstract	In this study, the authors propose a framework for inversion-based estimation of certain categories of faults in discrete-time linear systems. The fault signal, as an unknown input, is reconstructed from its projections onto two subspaces. The first projection is achieved through an algebraic operation, whereas the second projection is obtained by a dynamic filter whose poles coincide with the transmission zeros of the system. Feedback is then introduced to stabilise this filter as well as to provide an unbiased estimate of the unknown input. Their proposed methodology has two distinctive and practical advantages. First, it represents a unified approach to the problem of inversion of both minimum and non-minimum phase systems as well as systems having transmission zeros on the unit circle. Second, the feedback structure ensures that the proposed scheme is robust to noise. They have shown that the proposed inversion filter is unbiased for certain categories of faults. Finally, they have demonstrated the capabilities and performance of the proposed methodology through several numerical simulation case studies.
Starting Page	1629
Ending Page	1638
Page Count	10
ISSN	17518644
Volume Number	13
e-ISSN	17518652
Issue Number	Issue 11, Jul (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cta/13/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cta.2018.6278
Journal	IET Control Theory & Applications
Publisher Date	2019-04-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Algebra Algebraic Operation Control System Analysis Discrete Control System Discrete Time System Discrete-time Linear System Distinctive Advantages Dynamic Filter Fault Diagnosis Fault Signal Feedback Filtering Method in Signal Processing Filtering Theory Inversion Filter Inversion-based Estimation Linear System Nonminimum Phase System Phase Fault-to-output Dynamics Practical Advantages Projections Synthesis Method Transmission Zero Unbiased Estimate Unbiased Inversion-based Fault Estimation Unknown Input
Content Type	Text
Resource Type	Article
Subject	Control and Optimization Control and Systems Engineering Human-Computer Interaction Electrical and Electronic Engineering Computer Science Applications

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