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A new control design methodology is introduced for multi-input/multi-output systems with unstable open loop plants and saturating actuators. A control system is designed using well known linear control theory techniques and then a reference prefilter is introduced so that when the references are sufficiently small, the control system operates linearly as(More)
Abstmei-lhis paper presents a practical design perspective on multi-variable feedback control problem. It reviews the basic issue-feedback design in the face of uncertainties-and generalizes known single-input, singleoutput (SISO) statements and constraints of the design problem to multiinpat, multioutput ("0) c a s e s. Two major " 0 design a p proaches(More)
This paper examines the robustness properties of existing adaptive control algorithms to unmodeled plant high-frequency dynamics and unmeasurable output disturbances. It is demonstrated that there exist two infinite-gain operators in the nonlinear dynamic system which determines the time-evolution of output and parameter errors. The pragmatic implication of(More)
A systematic control design methodology is introduced for multi-input/multi-output stable open loop plants with multiple saturations. This new methodology is a substantial improvement over previous heuristic single-input/single-output approaches. The idea is to introduce a supervisor loop so that when the references and/or disturbances are sufficiently(More)
The field of automatic control provides the principles and methods used to design systems that maintain desirable performance by automatically adapting to changes in the environment. Aircraft auto-landing systems and sophisticated guided weapons, for example, automatically adjust control surfaces to adapt to changing winds and changes in weight and loads,(More)
—The paper considers a family of linear time-invariant and spatially-invariant (LTSI) systems that are both distributed and localized. The spatial responses of the distributed plant are localized in spatial neighborhoods of each location. The feedback computations are also distributed and the information flow is localized in a spatial neighborhood of each(More)
The preceding argument can be used to justify an infrequent The paper presents a frequency-domain estimator which can control-law redesign strategy. It is envisioned that a identify both a nominal model of a plant as well as a discrete-time estimator will be used to continually update the frequency-domain bounding function on the modeling error(More)
1. INTRODUCTION This paper reports the outcome of an exhaustive analyt-Due to space limitations we cannot possibly provide in ical and numerical investigation of stability and ro-this paper analytical and simulation evidence of all bustness properties of a wide class of adaptive control conclusions outlined in the abstract. Rather, we algorithms in the(More)