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IEEE Transactions on Automatic Control

Issue 10 • Oct 1992

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Displaying Results 1 - 25 of 45
  • Explicit parameterization of state deadbeat controllers

    Publication Year: 1992, Page(s):1584 - 1588
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A general state deadbeat control problem, not restricted to the controllability indexes, is posed and solved. A result for the explicit parameterization of deadbeat controllers is obtained. With the parameterization, only the genuine independent free parameters appear in the deadbeat controllers View full abstract»

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  • Model following controller with specified sensitivity function

    Publication Year: 1992, Page(s):1582 - 1584
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A design method for a model-following servo control system whose output sensitivity function is specified with a reference model is presented. Using this method, the plant output responses to reference input change and the output sensitivity function can be specified separately and directly View full abstract»

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  • Vibrational control of linear time lag systems with arbitrarily large but bounded delays

    Publication Year: 1992, Page(s):1576 - 1582
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    It is shown that vibrational stabilization can be effective for linear systems with large bounded delays. Theorems are given that define the procedures for the search of the stabilizing vibrations. Robust oscillatory stabilization insensitive to the delay size is also shown to take place for some classes of systems View full abstract»

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  • Parameterization of decoupling controllers in the unity-feedback system

    Publication Year: 1992, Page(s):1572 - 1576
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The problem of decoupling in the linear, time invariant, multiinput-multioutput unity-feedback system is studied. A parameterization of all stabilizing decoupling controllers and all achievable decoupled closed-loop transfer functions is obtained for full-row rank plants which do not have any coinciding poles and zeros in the undesirable region of the complex plane View full abstract»

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  • Adaptive hybrid force-position control for redundant manipulators

    Publication Year: 1992, Page(s):1501 - 1505
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    An adaptive control scheme for manipulators with redundant degrees of freedom is presented. The control purpose is to achieve a desired interaction force between the end-effector and the environment as well as to regulate the robot tip position in the Cartesian space. This control approach does not require measurement of the joint acceleration or the force derivative View full abstract»

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  • On adaptive friction compensation

    Publication Year: 1992, Page(s):1609 - 1612
    Cited by:  Papers (168)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A method of compensating for friction in control systems is presented. The method entails the use of an observer to estimate the friction which is modeled as a constant times the sign of the velocity. The purpose of the observer is to estimate this constant. The observer model is selected to ensure that the error in estimation of the friction constant converges asymptotically to zero. Simulation r... View full abstract»

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  • Robust stability of delay dependence for linear uncertain systems

    Publication Year: 1992, Page(s):1656 - 1659
    Cited by:  Papers (147)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A sufficient condition for the stability of the linear uncertain time-delay systems is presented. The result obtained can include information on the size of the delay, and therefore can be a delay-dependent stability condition. The Lyapunov method is employed to investigate the problem. The result is demonstrated by an illustrative example View full abstract»

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  • Root clustering for convex combination of complex polynomials

    Publication Year: 1992, Page(s):1520 - 1522
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    In some important applications, such as the edge-theorem, it is required that a polynomial is α-stable along a parameter segment. Using the critical constraint, the necessary and sufficient conditions for root clustering (α-stability) of convex combinations of complex polynomials are presented. The approach is general and requires that a certain real polynomial has no zeros in the open... View full abstract»

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  • Optimal L bounds for disturbance robustness

    Publication Year: 1992, Page(s):1568 - 1572
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Robust disturbance rejection bounds obtained recently by Zhu et al. are tight with respect to the disturbance set that has a specified L2 norm bound. It is shown that the bounds are also tight with respect to a weighted L2 disturbance set that has a specified bound on its outer product by choosing a special weight matrix in the L2 norm. T... View full abstract»

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  • Extensions and generalizations of smoothed perturbation analysis in a generalized semi-Markov process framework

    Publication Year: 1992, Page(s):1483 - 1500
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1436 KB)

    Under a very general framework, both in terms of finite-time performance measures and system structure, the authors derive smoothed perturbation analysis (SPA) estimators and prove their unbiasedness. The commuting condition, which has been key in previous work, is not required a priori, and thus the framework includes such systems as the GI/G/1/K queue and multiclass queueing networks, which do n... View full abstract»

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  • Control of linear discrete-time periodic systems: a decentralized control approach

    Publication Year: 1992, Page(s):1644 - 1648
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A decentralized control technique is applied to the problem of periodic output feedback, stabilization or pole-assignment for a periodically time-varying discrete-time system. It is shown that the problem can be reduced to that of stabilizing or pole-assigning a general proper multichannel system by static output feedback on the basis of the equivalence between periodic systems and a class of line... View full abstract»

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  • Global tunability of one-dimensional SISO systems

    Publication Year: 1992, Page(s):1605 - 1608
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    It is shown by example that with a suitably defined certainty equivalence controller ΣR, it is possible to make a closed-loop parameterized system Σ tunable on its entire parameter space P, even though P may contain points at which the parameterized ΣD, upon which ΣR's definition is based, is not stabilizable. The implications of this discov... View full abstract»

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  • Robust sampled-data control

    Publication Year: 1992, Page(s):1591 - 1597
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Robust stabilization of a class of linear systems using sampled-data feedback control is studied. It is shown that a linear, time-invariant system subject to additive perturbations can be stabilized using high-gain periodic feedback from sampled values of the state, provided that the perturbations satisfy certain structural conditions. This result is also extended to decentralized sampled-data con... View full abstract»

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  • Kalman decomposition for implicit linear systems

    Publication Year: 1992, Page(s):1509 - 1514
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The Kalman decomposition for a general class of implicit systems is introduced and studied. The properties of strong reachability, observability, acceptance of all inputs and outer sequences, output-uniqueness, uniqueness, and trajectory observability of the original system are related to the properties of its subsystems obtained via the Kalman decomposition. The problems of transfer relation, reg... View full abstract»

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  • Note on `distributed scheduling based on due dates and buffer priorities' by S.H. Lu and P.R. Kumar

    Publication Year: 1992, Page(s):1661 - 1662
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    In the above-titled paper by Lu and Kumar (ibid., vol.36. no.12, pp.1406-1416, Dec 91), the issue of stability of a scheduling policy for a system with reentrant structure is studied. It has been shown that whenever the arrival rate, allowing for some burstiness, is less than the system capacity, the following four scheduling policies are stable: first buffer first serve, last buffer first serve, ... View full abstract»

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  • On stabilizability and sampling for infinite dimensional systems

    Publication Year: 1992, Page(s):1653 - 1656
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Some questions, either motivated by or related to time sampling, regarding the stabilizability of infinite-dimensional or distributed parameter systems are considered. In particular, these include the characteristics of those systems which are finite rank stabilizable, and the preservation of stabilizability under sampling. A pathological class of systems, which, when sampled, may be rendered unst... View full abstract»

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  • Coprime matrix fraction description via orthogonal structure theorem

    Publication Year: 1992, Page(s):1517 - 1520
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    An algorithm to compute the coprime matrix fraction description from a given transfer function matrix W(s) is presented. The algorithm is based on Householder transformations to compute the minimal realization of W(s) and on the orthogonal version of the structure theorem of W.A. Wolovich (1974) and of Wolovich and P.L. Falb (1969) to determine the coprime form.... View full abstract»

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  • On the robustness of LQ regulators for discrete-time systems

    Publication Year: 1992, Page(s):1564 - 1568
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A sufficient condition for quadratic stabilizability of uncertain linear discrete-time systems using LQ regulators is presented. The true system is represented by a nominal model plus additive terms representing the most common types of uncertainties in the state and input matrices. Sufficient robustness bounds as well as a robustification procedure for discrete-time LQ regulators are presented an... View full abstract»

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  • A double look at duality

    Publication Year: 1992, Page(s):1474 - 1482
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    The two forms of duality that are encountered most frequently by the systems theorist-linear duality and convex duality-are examined. Linear duality has a strong algebraic characterization which extends to other structures such as groups and modules. Convex duality, on the other hand, capitalizes so strongly on the vector space structure that the resulting powerful theory (which is typically inter... View full abstract»

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  • On finite precision Lyapunov functions for companion matrices

    Publication Year: 1992, Page(s):1640 - 1644
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The finite precision stability of a discrete-time system realized in companion form is shown to be closely connected to a positive real character of a related all-pole-minus-one-half transfer function. This is shown as a consequence of some novel characterizations of solutions to a Lyapunov equation for companion matrices. The results are of practical significance as companion matrix state recursi... View full abstract»

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  • Conditions for stable zeros of sampled systems

    Publication Year: 1992, Page(s):1558 - 1561
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A criterion for there being no unstable discrete zeros is derived in terms of coefficients of a continuous-time transfer function and of a sampling period when a continuous-time, stable, and strictly proper plant is sampled. It is also shown that the shortest sampling period ensuring minimum-phase behavior can be calculated from a simple equation View full abstract»

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  • Stability of interval matrices: the real eigenvalue case

    Publication Year: 1992, Page(s):1604 - 1605
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    C.V. Hollot and A.C. Bartlett (1987) showed that testing at most 2 to the n2 certain matrices for stability is sufficient for verifying stability of an n×n interval matrix with real eigenvalues. It is proven that this upper bound can be reduced to 22n-1, and a special case where testing only two matrices is needed is considered View full abstract»

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  • A microcomputer implementation of multivariable factorization theory

    Publication Year: 1992, Page(s):1631 - 1634
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Factorization theory forms the basis of a powerful new method for the design of linear control systems. Techniques which simplify the implementation of this approach are examined: in particular, it is shown that under certain conditions, the multivariable design problem may be divided into a number of smaller independent subproblems. A microcomputer design system employing these techniques has bee... View full abstract»

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  • A robust stability bound of linear systems with structured uncertainty

    Publication Year: 1992, Page(s):1549 - 1551
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The robust stability of linear uncertain systems with multiple uncertain parameters is considered. A sphere norm bound condition on the uncertainties, which assures stability of the systems, is derived. This bound is shown to be less conservative than existing ones. A necessary condition to maximize this bound is also given View full abstract»

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  • An improved covariance assignment theory for discrete systems

    Publication Year: 1992, Page(s):1588 - 1591
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    For discrete systems, the set of all state covariances X which can be assigned to the closed-loop system via a dynamic controller is characterized explicitly. For any assignable state covariance X , the set of all controllers that assign this X to the closed-loop system is parameterized with an arbitrary orthonormal matrix U of proper dimension 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

Full Aims & Scope

Meet Our Editors

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