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Automatic Control, IEEE Transactions on

Issue 6 • Date Jun 1989

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Displaying Results 1 - 22 of 22
  • Recursive inversion of externally defined linear systems by FIR filters

    Publication Year: 1989 , Page(s): 635 - 637
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (240 KB)  

    The approximate inversion of an internally unknown linear system, given by its impulse response sequence, by an inverse system having a finite impulse response, is considered. The recursive least-squares procedure is shown to have an exact initialization based on the triangular Toeplitz structure of the matrix involved. The proposed approach also suggests solutions to the problem of system identif... View full abstract»

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  • Structured singular value analysis of multidimensional system stability

    Publication Year: 1989 , Page(s): 638 - 639
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (168 KB)  

    Structured singular value computations are being developed for analysis of robustness of multivariable control systems. It is shown that the same computational tools can be used to test the stability of multidimensional systems View full abstract»

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  • Further remarks on potentially global stabilizability

    Publication Year: 1989 , Page(s): 637 - 639
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (168 KB)  

    Given a control system with a nonlinear drift term, it is proved that a linear-like criterion for almost-global stabilizability can be stated, at least for control systems of the form x'=f( x)+Bu, where f is a polynomial but not necessarily homogeneous vector field. These stability criteria also allow for the control of the size of the region of attract... View full abstract»

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  • Switching curve deformation in a time-optimal closed-loop system

    Publication Year: 1989 , Page(s): 654 - 656
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (264 KB)  

    The dynamics of a closed-loop system resulting from the solution of a time-optimal problem of a two-dimensional differential inclusion are discussed. It is shown that internal uncertainties (such as variations in resistances or parameter changes) cause trajectories of the closed-loop motion to (1) spiral convergently around the target and reach it in a finite time; (2) spiral divergently around th... View full abstract»

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  • A modification of the Nevanlinna algorithm on the solution of the Hm×n-optimization problem

    Publication Year: 1989 , Page(s): 627 - 629
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (188 KB)  

    A modification of the Nevanlinna algorithm is presented for the solution of the Hm×m-optimization problem. This is an essential modification when the Nevanlinna algorithm is applied to find the extremal function of the matrix H interpolation problem which deals with the case that the interpolation points have multiplicities. Fo... View full abstract»

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  • The square-root overdetermined recursive instrumental variable algorithm

    Publication Year: 1989 , Page(s): 656 - 658
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (228 KB)  

    A square-root version of the overdetermined recursive instrumental variable (ORIV) algorithm is derived. This version improves the numerical stability of the algorithm, and avoids the problem of positive-definiteness of the inverse covariance matrix. The algorithm uses square-root arrays, and both orthogonal and hyperbolic rotations, as necessitated by the nature of the ORIV algorithm View full abstract»

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  • Strict Hurwitz property of polynomials under coefficient perturbation

    Publication Year: 1989 , Page(s): 629 - 632
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (276 KB)  

    A simple procedure for computing the allowable interval coefficient perturbations of a strictly stable polynomial is presented. The amount of computations involved is very little, while the procedure is able to handle the case where the relative uncertainty of the polynomial coefficients are not known. It can also handle the case of linearly dependent parameter uncertainties. The procedure can als... View full abstract»

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  • Least-squares output estimation with multirate sampling

    Publication Year: 1989 , Page(s): 669 - 672
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (268 KB)  

    A least-squares output estimation algorithm is presented for applications where the output is sampled at a slower rate than the input. Given the sequence {u(kT), y(kJT )k=1,2,...}, where J is a positive integer and T is the basic sampling period, it is proven that the output estimation error converges to zero for instants at or between... View full abstract»

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  • Decomposition of 2-D linear systems into 1-D systems in the frequency domain

    Publication Year: 1989 , Page(s): 639 - 641
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (212 KB)  

    A method is presented for the decomposition of the frequency domain of 2-D linear systems into two equivalent 1-D systems having dynamics in different directions and connected by a feedback system. It is shown that under some assumptions the decomposition problem can be reduced to finding a realizable solution to the matrix polynomial equation X(z1)P(... View full abstract»

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  • Approximation of infinite-dimensional systems

    Publication Year: 1989 , Page(s): 610 - 618
    Cited by:  Papers (54)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (712 KB)  

    A Fourier series-based method for approximation of stable infinite-dimensional linear time-invariant system models is discussed. The basic idea is to compute the Fourier series coefficients of the associated transfer function Td(Z) and then take a high-order partial sum. Two results on H convergence and associated error bounds of the partial... View full abstract»

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  • Adaptive aggregation methods for infinite horizon dynamic programming

    Publication Year: 1989 , Page(s): 589 - 598
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (916 KB)  

    A class of iterative aggregation algorithms for solving infinite horizon dynamic programming problems is proposed. The idea is to interject aggregation iterations in the course of the usual successive approximation method. An important feature that sets this method apart from earlier ones is that the aggregate groups of states change adaptively from one aggregation iteration to the next, depending... View full abstract»

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  • The relationship between real poles and real zeros in SISO sampled data systems

    Publication Year: 1989 , Page(s): 632 - 635
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (304 KB)  

    A relationship between real poles and real zeros of SISO (single-input, single-output) sampled data systems is presented, which is independent of the sampling period. The relation is stated in terms of a parity property involving the number of real zeros between any two real poles. This property allows the investigation of conditions for the preservation of stable or unstable zeros under sampling.... View full abstract»

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  • Quantizer effects on steady-state error specifications of digital feedback control systems

    Publication Year: 1989 , Page(s): 651 - 654
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (316 KB)  

    Suppose that for a linear, time-invariant, single-input single-output (SISO) plant a digital dynamic controller has been designed so that the corresponding discrete-time linear feedback control system will satisfy certain specified steady-state error criteria (e.g., the output v˜(kT) will follow the input r (kT) within a certain given error bound). Corresp... View full abstract»

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  • A general theory for the Wiener-Hopf design of multivariable control systems

    Publication Year: 1989 , Page(s): 619 - 626
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (660 KB)  

    Multivariable control system design in a quadratic cost setting is treated for a completely general configuration. The class of all controllers is determined for which the general configuration is internally asymptotically stable and a quadratic cost functional is finite. This controller class is parameterized in terms of an arbitrary real rational strictly-proper matrix Z(s), wh... View full abstract»

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  • A fuzzy transient stability index in power system security evaluation

    Publication Year: 1989 , Page(s): 662 - 666
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (516 KB)  

    A transient stability index is described for the online security evaluation of electric power systems by providing a measure for their level of security. A technique for constructing this index is developed, applying the principles of pattern recognition and fuzzy sets theory while the stability determination is based on the initial fault-on accelerations of machine rotors. The analysis of two sam... View full abstract»

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  • Output deadbeat control discrete-time multivariate systems

    Publication Year: 1989 , Page(s): 644 - 648
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (392 KB)  

    An algorithm is presented to compute output deadbeat controls for linear multivariable systems. The algorithm, based on quadratic optimization with no cost on control (cheap control), is numerically stable and covers the most general cases. The resulting controls are internally stable and are shown to drive the outputs of the system to zero in minimum time using state feedback. The central part of... View full abstract»

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  • Multirate sampled-data control of two-time-scale systems

    Publication Year: 1989 , Page(s): 642 - 644
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (244 KB)  

    Two-time-scale decoupling is adopted to obtain slow and fast subsystems. Based on these subsystems, a multirate composite control strategy is derived. It is shown how a recently presented multirate scheme can be modified to handle slow, nonzero mean disturbances, by introducing time incremental models. The improvements with the given multirate control law are illustrated by an example View full abstract»

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  • Measures of controllability and observability and residues

    Publication Year: 1989 , Page(s): 648 - 650
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (232 KB)  

    The relationship between two measures of controllability and observability is derived, given a linear time-invariant system. Both of the measures are based on angles between various subspaces of the state space. It is shown that these measures can be used to bound the norm of the residues of the transfer function View full abstract»

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  • Numerical algorithms for eigenvalue assignment by constant and dynamic output feedback

    Publication Year: 1989 , Page(s): 579 - 588
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (956 KB)  

    Algorithms are proposed for eigenvalue assignment (EVA) by constant as well as dynamic output feedback. The main algorithm is developed for single-input, multioutput systems and the results are then extended to multiinput, multioutput systems. In computing the feedback, use is made of the fact that the closed-loop eigenvalues can almost always be assigned arbitrarily close to the desired locations... View full abstract»

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  • An adaptive controller which provides Lyapunov stability

    Publication Year: 1989 , Page(s): 599 - 609
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (788 KB)  

    An adaptive controller that can provide exponential Lyapunov stability for an unknown linear time-invariant (LTI) system is presented. The only required a priori information about the plant is that the order of an LTI stabilizing compensator be known, although this can be reduced to assuming only that the plant is stabilizable and detectable at the expense of using a more complicated controller. T... View full abstract»

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  • A hierarchical approach to bargaining in power pool management

    Publication Year: 1989 , Page(s): 666 - 669
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (348 KB)  

    Co-operative operation of an electric power pool is considered. A three-level dynamic hierarchical decomposition approach to determine the intrapool power exchanges over time is proposed. The approach results in independent operation of the electric utilities. To guarantee both fair division of the cost savings achieved and feasible intrapool energy exchanges, the utilities are coordinated in the ... View full abstract»

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  • A stopping rule for least-squares identification

    Publication Year: 1989 , Page(s): 659 - 662
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (268 KB)  

    A stopping rule for least-squares identification is developed. The stopping rule is determined by the construction of a confidence ellipsoid. For any predetermined estimation error ε>0, if the iterates are inside of an ellipsoidal confidence region with volume less than or equal to εr, then the recursive online algorithm will be terminated with high probability 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