IEEE Transactions on Automatic Control

Issue 5 • May 2000

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Displaying Results 1 - 25 of 33
  • Comments on "Robustifying nonlinear systems using high-order neural network controllers"

    Publication Year: 2000, Page(s):1033 - 1036
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (177 KB)

    *** PLEASE ASK ME ABOUT THIS (PHILIP) *** In the original paper by G.A. Rovithakis (ibid., vol.44, p.102-8, 1999), a nonlinear dynamical system is considered. The author indicates that Rovithakis overlooked some essential assumptions on the allowable perturbations, that the problem is therefore not well-posed, and that the controller derived is incorrect Rovithakis replies that it is well known th... View full abstract»

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  • Author's reply

    Publication Year: 2000, Page(s): 1036
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (47 KB)

    First Page of the Article
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  • Random iterative models [Book Reviews]

    Publication Year: 2000, Page(s):1037 - 1039
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    Freely Available from IEEE
  • Computing efforts allocation for ordinal optimization and discrete event simulation

    Publication Year: 2000, Page(s):960 - 964
    Cited by:  Papers (63)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    Ordinal optimization has emerged as an efficient technique for simulation and optimization. Exponential convergence rates can be achieved in many cases. In this paper, we present a new approach that can further enhance the efficiency of ordinal optimization. Our approach intelligently determines the optimal number of simulation replications (or samples) and significantly reduces the total simulati... View full abstract»

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  • Virtual reference direct design method: an off-line approach to data-based control system design

    Publication Year: 2000, Page(s):954 - 959
    Cited by:  Papers (71)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    This paper presents a direct model-reference approach to the off-line design of linear controllers, suited to deal with plants described by a single set of open-loop I/O measurements only. The method is direct inasmuch as the controller parameters are directly estimated with no preliminary identification of any model to describe the plant. The design can be carried out off-line and, in the present... View full abstract»

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  • Nonlinear repetitive control

    Publication Year: 2000, Page(s):949 - 954
    Cited by:  Papers (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    Repetitive controllers are generally applied to reject periodic disturbances and to track periodic reference signals with a known period. Their design is based on the internal model principle, proposed by Francis and Wonham (1975). This paper describes a new finite-dimensional SISO repetitive controller for two different classes of nonlinear plants. Simulation results show asymptotic tracking of t... View full abstract»

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  • A generalized chain-scattering representation and its algebraic system properties

    Publication Year: 2000, Page(s):1002 - 1007
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Presents a generalization of the chain-scattering representation to the case of general plants. Through the notion of input-output consistency, the conditions under which the generalized chain-scattering representation (GCSR) and the dual-generalized chain-scattering representation (DGCSR) exist are proposed. The generalized chain-scattering matrices are formulated into a general parameterized for... View full abstract»

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  • Output feedback control of Markov jump linear systems in continuous-time

    Publication Year: 2000, Page(s):944 - 949
    Cited by:  Papers (253)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    This paper addresses the dynamic output feedback control problem of continuous-time Markovian jump linear systems. The fundamental point in the analysis is an LMI characterization, comprising all dynamical compensators that stabilize the closed-loop system in the mean square sense. The H2 and H∞-norm control problems are studied, and the H2 and H∞<... View full abstract»

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  • Instantaneous impulse response of nonlinear system

    Publication Year: 2000, Page(s):999 - 1001
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    Mathematical models for nonlinear systems, which admit both standard integrable and impulsive inputs are developed. It is shown that instantaneous response of a nonlinear system to an impulse is not, in general, single-valued, whereas a particular response can be selected through the construction of an auxiliary system. The complete integrability of the auxiliary system is proven to guarantee uniq... View full abstract»

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  • Robust and minimum norm pole assignment with periodic state feedback

    Publication Year: 2000, Page(s):1017 - 1022
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A computational approach is proposed to solve the minimum norm or robust pole assignment problem for linear periodic discrete-time systems. The proposed approach uses a periodic Sylvester-equation-based parametrization of the periodic pole assignment problem and exploits the nonuniqueness of the problem by imposing conditions on the norm of the resulting periodic state feedback or on the condition... View full abstract»

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  • Existence and design of functional observers for linear systems

    Publication Year: 2000, Page(s):940 - 943
    Cited by:  Papers (108)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    This paper presents straightforward derivations of the functional observers design for linear time-invariant multivariable systems. The order of these observers is equal to the dimension τ of the vector to be estimated. Necessary and sufficient conditions for the existence and stability of these observers are given. Illustrative examples are included View full abstract»

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  • Using scales in the multiobjective approach

    Publication Year: 2000, Page(s):973 - 977
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    Scales are used to reduce the conservatism encountered in most multiobjective approaches to control design. The most general case (i.e., matrix scales) results in a nonconvex problem, though the use of scalar scales leads to convex searches in the analysis and state feedback problems. Output feedback synthesis and other extensions are discussed. Numerical examples are provided to show the effectiv... View full abstract»

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  • A new linear adaptive controller: design, analysis and performance

    Publication Year: 2000, Page(s):883 - 897
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The certainty equivalence and polynomial approach, widely used for designing adaptive controllers, leads to “simple” adaptive control designs that guarantee stability, asymptotic error convergence, and robustness, but not necessarily good transient performance. Backstepping and tuning functions techniques, on the other hand, are used to design adaptive controllers that guarantee stabil... View full abstract»

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  • Observation control for discrete-continuous stochastic systems

    Publication Year: 2000, Page(s):993 - 998
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    Presents a theoretical framework for the optimization of observations in partially observable linear discrete-continuous stochastic systems. The problem of achievement of the best quality of estimation with discrete and continuous observations is reduced to a deterministic one with impulse or generalized control. An approach based on the discontinuous time transformation is presented and used to r... View full abstract»

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  • A two-step adaptive controller for a two-body system

    Publication Year: 2000, Page(s):1011 - 1016
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    A reduced-order adaptive control scheme using a direct state-feedback control law and an indirect feedforward compensation design is presented for a two-body system with joint flexibility and damping. A detailed stability analysis is given for such a two-step adaptive control design, which ensures closed-loop signal boundedness and asymptotic output tracking View full abstract»

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  • On the design of a nonlinear adaptive variable structure derivative estimator

    Publication Year: 2000, Page(s):1028 - 1033
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Develops a derivative estimator using variable structure system (VSS) and adaptive techniques. The proposed nonlinear adaptive variable structure derivative estimator requires little knowledge about the observed signal source and is able to handle the observed signals that are the outputs of either linear or nonlinear dynamic systems with uncertainties. In the absence of system noise, the uniform ... View full abstract»

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  • Discontinuous unit feedback control of uncertain infinite-dimensional systems

    Publication Year: 2000, Page(s):834 - 843
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Control systems, driven by a discontinuous unit feedback in a Hilbert space, are studied. The equation which describes a system motion, taking place in the discontinuity manifold and further referred to as a sliding mode, is derived by means of a special regularization technique. Based on the sliding mode equation, the procedure of synthesis of a discontinuous unit control signal is developed. Res... View full abstract»

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  • Extension of Parrott's theorem to nondefinite scalings

    Publication Year: 2000, Page(s):937 - 940
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    In this paper, the matrix version of Parrott's theorem is extended to encompass nondefinite scalings. This extension can be used to relax the causality requirements for many linear matrix inequality based synthesis problems View full abstract»

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  • Template languages for fault monitoring of timed discrete event processes

    Publication Year: 2000, Page(s):868 - 882
    Cited by:  Papers (79)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    This paper introduces a new framework for modeling discrete event processes. This framework, called condition templates, allows the modeling of processes in which both single-instance and multiple-instance behaviors are exhibited concurrently. A single-instance behavior corresponds to a trace from a single finite-state process, and a multiple-instance behavior corresponds to the timed interleaving... View full abstract»

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  • Maximum likelihood parameter estimation from incomplete data via the sensitivity equations: the continuous-time case

    Publication Year: 2000, Page(s):928 - 934
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    This paper deals with maximum likelihood (ML) parameter estimation of continuous-time nonlinear partially observed stochastic systems, via the expectation maximization (EM) algorithm. It is shown that the EM algorithm can be executed efficiently, provided the unnormalized conditional density of nonlinear filtering is either explicitly solvable or numerically implemented. The methodology exploits t... View full abstract»

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  • Exponential stabilization of a class of unstable bilinear systems

    Publication Year: 2000, Page(s):989 - 992
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    Considers the control design of bilinear systems with multiplicative control inputs. Previous control designs for such systems normally assume that the open-loop bilinear system is (neutrally) stable. In this paper, a nonlinear control design is proposed for open-loop unstable bilinear systems. The new control stabilizes the bilinear system globally and exponentially if a sufficient stability cond... View full abstract»

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  • Optimal adaptive control for estimation of parameters of ARX models

    Publication Year: 2000, Page(s):964 - 968
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The objective of this paper is to find an adaptive control strategy which would enable us to estimate the parameters of the ARX model as accurately as possible while keeping the output of the system below a specified level of variability. It turns out that this optimal experiment design problem can be solved by using the Astrom-Wittenmark self-tuning tracker (1973) with a specific choice of the re... View full abstract»

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  • A hybrid genetic algorithm for estimating the optimal time scale of linear systems approximations using Laguerre models

    Publication Year: 2000, Page(s):1007 - 1011
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    We deal with the problem of finding the optimal time scale of the truncated Laguerre series using numerical search techniques. We develop a hybrid genetic algorithm (GA) to search the nonlinear, multimodal squared-error function that results from least-squares approximations of the impulse response of causal linear time-invariant stable systems. The hybrid GA incorporates a Newton-Raphson (NR) loc... View full abstract»

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  • Global output-feedback tracking for a benchmark nonlinear system

    Publication Year: 2000, Page(s):1023 - 1027
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    The output-feedback global tracking problem is solved for the well-known nonlinear benchmark RTAC (rotational-translational actuator) system, in which one of the unmeasured states appears quadratically in the state equations. Our observer/controller backstepping design yields a nonlinear output-feedback controller that forces the translational displacement to globally asymptotically track an appro... View full abstract»

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  • An exponentially stable adaptive friction compensator

    Publication Year: 2000, Page(s):977 - 980
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    This note presents a novel adaptive compensation scheme for Coulomb friction in a servocontrol system. An adaptive observer for estimating the unknown Coulomb friction coefficient is also derived on the basis of the Lyapunov technique. In addition, a linearizing control law is developed to compensate for the friction force and obtain the tracking objective. The proposed adaptive compensation guara... View full abstract»

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Aims & Scope

In the IEEE Transactions on Automatic Control, the IEEE Control Systems Society publishes high-quality papers on the theory, design, and applications of control engineering.  Two types of contributions are regularly considered

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Meet Our Editors

Editor-in-Chief
P. J. Antsaklis
Dept. Electrical Engineering
University of Notre Dame