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STABILITY AND H ∞ DISTURBANCE ATTENUATION ANALYSIS FOR LTI CONTROL SYSTEMS WITH CONTROLLER FAILURES
Author(s) -
Zhai Guisheng,
Chen Xinkai,
Takai Shigemasa,
Yasuda Kazunori
Publication year - 2004
Publication title -
asian journal of control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.769
H-Index - 53
eISSN - 1934-6093
pISSN - 1561-8625
DOI - 10.1111/j.1934-6093.2004.tb00188.x
Subject(s) - unavailability , control theory (sociology) , attenuation , controller (irrigation) , lyapunov function , disturbance (geology) , piecewise , stability (learning theory) , exponential stability , mathematics , computer science , control (management) , nonlinear system , physics , statistics , mathematical analysis , paleontology , agronomy , quantum mechanics , artificial intelligence , machine learning , optics , biology
ABSTRACT In this paper, we analyze stability and H ∞ disturbance attenuation properties for linear time‐invariant (LTI) systems controlled by a pre‐designed dynamical output feedback controller which fails from time to time due to physical or purposeful reasons. Our aim is to find conditions concerning the controller failure time, under which the system's stability and H ∞ disturbance attenuation properties are preserved to a desired level. For stability, by using a piecewise Lyapunov function, we show that if the unavailability rate of the controller is smaller than a specified constant and the average time interval between controller failures (ATBCF) is large enough, then the global exponential stability of the system is guaranteed. For H ∞ disturbance attenuation, also by using a piecewise Lyapunov function, we show that if the unavailability rate of the controller is smaller than a specified constant, then a system with an ATBCF achieves a reasonable weighted H ∞ disturbance attenuation level, and the weighted H ∞ disturbance attenuation approaches normal H ∞ disturbance attenuation when the ATBCF is sufficiently large.