IEEE Transactions on Automatic Control

Issue 2 • Feb. 1995

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Displaying Results 1 - 25 of 33
  • Comments on the loop transfer recovery

    Publication Year: 1995, Page(s):335 - 337
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    This paper deals with observer-based linear control systems. More precisely, it is shown that Tsui's loop transfer recovery procedure can lead to poor results.<> View full abstract»

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  • Consistency of modified LS estimation method for identifying 2-D noncausal SAR model parameters

    Publication Year: 1995, Page(s):316 - 320
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Least squares (LS) and maximum likelihood (ML) are the two main methods for parameter estimation of two-dimensional (2D) noncausal simultaneous autoregressive (SAR) models. ML is asymptotically consistent and unbiased but computationally unattractive. On the other hand, conventional LS is computationally efficient but does not produce accurate parameter estimates for noncausal models. Recently, Zh... View full abstract»

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  • Recursive identification method for MISO Wiener-Hammerstein model

    Publication Year: 1995, Page(s):287 - 291
    Cited by:  Papers (95)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A simple technique for recursive identification of the Wiener-Hammerstein model with extension to the multi-input single-output (MISO) case is presented. We use a new transformation of the input-output difference equation where parameters to be estimated are those of each subsystem of the initial and unique realization. After that, a weighted extended least squares method is employed to estimate r... View full abstract»

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  • Properties of optimal weighted sensitivity designs

    Publication Year: 1995, Page(s):298 - 301
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    Weighted sensitivity designs for a class of single-input/single-output, linear time-invariant systems are shown to have the property that the optimal controller has fewer right-half plane poles than the plant has right-half plane zeros. While weighted complementary sensitivity designs are shown to have the property that the optimal controller has fewer right-half plane zeros than the plant has rig... View full abstract»

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  • A subspace fitting method for identification of linear state-space models

    Publication Year: 1995, Page(s):311 - 316
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    A new method is presented for the identification of systems parameterized by linear state-space models. The method relies on the concept of subspace fitting, wherein an input/output data model parameterized by the state matrices is found that best fits, in the least-squares sense, the dominant subspace of the measured data. Some empirical results are included to illustrate the performance advantag... View full abstract»

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  • On the ordering of optimal hedging points in a class of manufacturing flow control models

    Publication Year: 1995, Page(s):282 - 286
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The optimal flow control policy of a single-product unreliable manufacturing system that must meet a constant demand rate is known to be a threshold type policy: safety production surplus levels called hedging points (thresholds) are associated with each discrete stochastic capacity state of the system and serve to protect the production process from uncertainty in future capacity availability. Th... View full abstract»

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  • Stability of queueing networks and scheduling policies

    Publication Year: 1995, Page(s):251 - 260
    Cited by:  Papers (143)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    We develop a programmatic procedure for establishing the stability of queueing networks and scheduling policies. The method uses linear or nonlinear programming to determine what is an appropriate quadratic functional to use as a Lyapunov function. If the underlying system is Markovian, our method establishes not only positive recurrence and the existence of a steady-state probability distribution... View full abstract»

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  • Boundary fractional derivative control of the wave equation

    Publication Year: 1995, Page(s):378 - 382
    Cited by:  Papers (55)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The wave equation, with fractional derivative feedback at the boundary, is studied. The existence and uniqueness, as well as the asymptotic decay of the solution towards zero is proved. The method used is motivated by the fact that the input-output relationship as generalized diffusion equations, defined on the infinite spatial domain R with collocated sensor and actuator control, can be expressed... View full abstract»

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  • Relative stability of a linear time-varying process with first-order nonlinear time-varying feedback

    Publication Year: 1995, Page(s):296 - 298
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A method of establishing sufficient conditions for the stability of a system consisting of a time-varying linear process and a first-order nonlinear time-varying feedback is presented. Rate of decay of unforced response and BIBO stability can also be determined. The governing equation of the system is represented in the form of an integro-differential equation, so that a modified form of the Lyapu... View full abstract»

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  • Pursuing a maneuvering target which uses a random process for its control

    Publication Year: 1995, Page(s):307 - 311
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Since a pursuer pursuing a maneuvering target does not know what maneuvers an evading target will make, the maneuvers (the target's control law) appear as a random process to the pursuer. However, he has opinions about what the evader will do. From these, he can assign a prior probability distribution to the evader's maneuvers. For a linear pursuit evasion problem in which the evader's control law... View full abstract»

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  • Second-order properties of families of discrete-event systems

    Publication Year: 1995, Page(s):261 - 271
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    We consider discrete-event systems (DES) whose logical component is characterized by a constraint set and whose temporal mechanism involves synchronization of the clock sequence with a master clock. We are interested in determining sufficient conditions on the constraint sets of a family of such synchronous DES which ensure that the event counting process of one system dominates the convex combina... View full abstract»

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  • Computation of approximate null vectors of Sylvester and Lyapunov operators

    Publication Year: 1995, Page(s):387 - 391
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    This paper describes an effective algorithm for computing approximate null vectors of certain matrix operators associated with Sylvester or Lyapunov equations. The singular value decomposition and rank-revealing QR methods are two widely used stable algorithms for numerical determination of the rank and nullity of a matrix A. These methods, however, are not readily applicable to Sylvester and Lyap... View full abstract»

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  • Continuous robust control design for nonlinear uncertain systems without a priori knowledge of control direction

    Publication Year: 1995, Page(s):276 - 282
    Cited by:  Papers (67)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    In this paper, a robust control scheme is proposed for a class of nonlinear systems that have not only additive nonlinear uncertainties but also unknown multiplicative signs. These signs are called control directions since they represent effectively the direction of motion under any given control. Except for the unknown control directions, the class of systems satisfy the generalized matching cond... View full abstract»

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  • Adaptive back-pressure congestion control based on local information

    Publication Year: 1995, Page(s):236 - 250
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    The problem of distributed congestion control as it arises in communication networks as well as in manufacturing systems is studied in this paper. In particular, a multistage queueing system that models virtual circuit and datagram communication networks and a class of manufacturing systems are considered. The topology may be arbitrary, there are multiple traffic classes, and the routing can be cl... View full abstract»

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  • A new balanced canonical form for stable multivariable systems

    Publication Year: 1995, Page(s):374 - 378
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    A new balanced canonical form is presented for stable multivariable linear systems. Overlapping continuous block-balanced canonical forms were introduced by Hanson-Ober for the stable single-input/single-output (SISO) case as a generalisation of the balanced canonical form introduced by Ober (1987) for the SISO case. In the search for a generalization of these results to the multivariable case a n... View full abstract»

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  • Adaptive control of plants with unknown hystereses

    Publication Year: 1995, Page(s):200 - 212
    Cited by:  Papers (381)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    For a system with hysteresis, the authors present a parameterized hysteresis model and develop a hysteresis inverse. The authors then design adaptive controllers with an adaptive hysteresis inverse for plants with unknown hysteresis. A new adaptive controller structure is introduced which is capable of achieving a linear parameterization and a linear error model in the presence of a hysteresis non... View full abstract»

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  • Sensitivity properties of multirate feedback control systems, based on eigenstructure assignment

    Publication Year: 1995, Page(s):337 - 342
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Some sampled-data systems, e.g., fly-by-wire control schemes, have a necessarily multirate structure, various input and/or outputs sampled at different rates. When considering a multirate system which has parameter uncertainty, it is important to examine ways in which the full freedom of the multivariable design can be utilized to minimize the sensitivity to parameter variations. Given the accompa... View full abstract»

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  • Absolute stability criteria for multiple slope-restricted monotonic nonlinearities

    Publication Year: 1995, Page(s):361 - 365
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Absolute stability criteria such as the classical Popov criterion guarantee stability for a class of sector-bounded nonlinearities. Although the sector restriction bounds the admissible class of the nonlinearities, the local slope of the nonlinearity may be arbitrarily large. In this paper the authors derive absolute stability criteria for multiple slope-restricted time-invariant monotonic nonline... View full abstract»

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  • A robust hybrid stabilization strategy for equilibria

    Publication Year: 1995, Page(s):321 - 326
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    For an equilibrium of a general dynamical system, the domain of stability of a linear feedback controller is enlarged by the use of a general “hybrid” or “switching” strategy. The strategy is illustrated for numerical simulations of an inverted double pendulum on a cart View full abstract»

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  • Production rate control for failure-prone production systems with no backlog permitted

    Publication Year: 1995, Page(s):291 - 295
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    In this paper, we consider systems in which backlog is not allowed. We show that the hedging point policy is still optimal. For systems with backlog, it is usually quite straightforward to show that their optimal cost-to-go functions are convex-a key property that is needed for the hedging point policy to be optimal. With no backlog permitted, it becomes much more difficult to establish the convex... View full abstract»

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  • A periodic fixed-structure approach to multirate control

    Publication Year: 1995, Page(s):301 - 307
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    We develop an approach to designing reduced-order multirate controllers. A discrete-time model that accounts for the multirate timing sequence of measurements is presented and is shown to have periodically time-varying dynamics. Using discrete-time stability theory, the optimal projection approach to fixed-order (i.e. full- and reduced-order) dynamic compensation is generalized to obtain reduced-o... View full abstract»

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  • Robust stability under a class of nonlinear parametric perturbations

    Publication Year: 1995, Page(s):213 - 223
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    This paper considers the robust stability verification of linear time-invariant systems admitting a class of nonlinear parametric perturbations. The general setting is one of determining the closed-loop stability of systems whose open-loop transfer functions consist of powers, products, and ratios of polytopes of polynomials. Apart from this general setting, two special cases of independent intere... View full abstract»

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  • Observer-based parameter identifiers for nonlinear systems with parameter dependencies

    Publication Year: 1995, Page(s):382 - 387
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A class of nonlinear dynamical systems whose dynamics depend linearly on the unknown parameter vector is considered. After reviewing a standard observer-based identifier for estimating the unknown parameters, we propose a family of new identifiers which exploit the a priori known parameter dependencies. We then establish, under mild assumptions on the dynamical system, that: 1) the proposed identi... View full abstract»

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  • Regional pole placement of multivariable systems under control structure constraints

    Publication Year: 1995, Page(s):272 - 276
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Many controller realizations are structurally constrained. Some typical examples are static output feedback, constant gain feedback for multiple operating points of a system, two-controller feedback, and decentralized feedback. A general class of problems of regional pole placement of multivariable systems with such control structure constraints is considered and a unified numerical method is give... View full abstract»

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  • Discrete-time observers for singularly perturbed continuous-time systems

    Publication Year: 1995, Page(s):224 - 235
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    The use of discrete-time observers for nonlinear singularly perturbed continuous-time systems is explored. The observer design approach is based on inversion of state-to-measurement maps. The two-time-scale nature of the system is exploited by constructing separate reduced-order observers for the approximate slow and fast subsystems, using multirate measurements and computation. The reduced-order ... 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