Title of Paper:Adaptive reconfigurable control of systems with time-varying delay against unknown actuator faults

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Date of Publication:2014-11-01

Journal:INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING

Included Journals:SCIE、EI、Scopus

Volume:28

Issue:11

Page Number:1206-1226

ISSN No.:0890-6327

Key Words:active fault-tolerant control; adaptive control; time-varying delay; convex combination

Abstract:This work is concerned with the problem of delay-dependent adaptive fault-tolerant controller design against unknown actuator faults for linear continuous systems with time-varying delay. Based on the online estimation of possible faults by discontinuous adaptation law, identification parameters of the adaptive state feedback controller are updated autonomously to compensate the fault effects on the delayed system. For the first time, a convex combination idea and a projection-type adaptive approach are combined organically to derive the main results. A set of new delay-dependent reconfigurable stabilization criteria, which guarantee the stability of closed-loop systems in both fault-free and faulty cases, is established in terms of linear matrix inequalities. Two numerical instances for linear delayed systems and the linearized model for the lateral motion of Boeing 747 are respectively simulated to illustrate the superiority and the effectiveness of the presented adaptive delay-dependent results. Copyright (c) 2013 John Wiley & Sons, Ltd.