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IEEE Transactions on Automatic Control

Issue 4 • August 1980

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Displaying Results 1 - 25 of 56
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Stability analysis of discrete-time adaptive control schemes

    Publication Year: 1980, Page(s):710 - 716
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (646 KB)

    The stability properties of a fairly general diserete-time adaptive control scheme are analyzed. Sufficient conditions forL^{infty}stability in the presence of disturbances are given. The stability results are used to prove convergence of the process outputs in the disturbance-free case, without requiring any a priori stability assumption. View full abstract»

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  • State feedback decoupling with stability of linear constant (A,B,C,D) quadruples

    Publication Year: 1980, Page(s):739 - 743
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The aim of this paper is to deal with the general decoupling problem of linear constant (A, B, C, D) quadruples from two points of view. The first one is devoted to a characterization of the control laws that decouple quadruples by state feedback, which has been lacking up until now in spite of the results previously obtained by Morse in [4]. Here, we give a complete characterization of... View full abstract»

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  • Optimal mixed strategies in a dynamic game

    Publication Year: 1980, Page(s):743 - 749
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (758 KB)

    In this paper we treat a specific two-person, zero-sum, dynamic game of the typex_{k + 1} = f(x_{k}, u_{k}, w_{k}). The optimal solutions for this game (i.e, a saddle point) have to be sought in the class of mixed (synonymously, randomized) strategies. For this particular game a theory of optimality of mixed strategies is developed and a hierarchy of problems of increasing generality, w... View full abstract»

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  • K-observers for linear systems with unknown inputs

    Publication Year: 1980, Page(s):779 - 782
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The concepts ofK-observability with unknown inputs andK-observers for linear systems are introduced. This provides a unified solution to a class of (minimal) synthesis problems where the inputs to the given system are unknown. View full abstract»

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  • On the Lyapunov matrix equation

    Publication Year: 1980, Page(s):813 - 814
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (167 KB)

    In this paper the inequality which is satisfied by the determinant of the solution of the Lyapunov matrix equationA'Q + QA = - Dis presented. The result makes possible a lower estimate of product eigenvalues of the matrixQand dependence from eigenvalues of the matricesAandD. This result corresponds to those presented in [2] and [3], where an estimate of ... View full abstract»

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  • A new concept of eigenvalues and eigenvectors and its applications

    Publication Year: 1980, Page(s):824 - 826
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A new concept of "eigenvalues" and "eigenvectors" ofA(t)is introduced. This new concept reduces to the conventional one as a special case whenA(t)has constant "eigenvectors." Its applications to algebraic transformation and diagonal realization are given. View full abstract»

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  • A lower bound for the solution of the algebraic Riccati equation of optimal control and a geometric convergence rate for the Kleinman algorithm

    Publication Year: 1980, Page(s):826 - 829
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (327 KB)

    A new sharp lower bound for the solution of the algebraic Riccati equation of optimal control is presented for the case when the state cost matrixQis positive definite. The bound is easier to evaluate than previous sharp bounds. It is then used in the derivation of a geometric convergence rate for the Kleinman algorithm (an iterative method for solving the algebraic Riccati equation). View full abstract»

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  • A projected stochastic approximation method for adaptive filters and identifiers

    Publication Year: 1980, Page(s):836 - 838
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Generally, when stochastic approximation is used to identify the coefficients of a linear system or for an adaptive filter or equalizer, the iterate Xnis projected back onto some finite setG={x:|x_{i}|leq B, alli}, if it ever leaves it. The convergence of such truncated sequences have been discussed informally. Here it is shown, under very broad conditions on the n... View full abstract»

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  • Unimodality conditions for Gaussian sums

    Publication Year: 1980, Page(s):838 - 839
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    In this correspondence multivariable sufficient conditions for the unimodality of Gaussian sums (normal mixtures) with two terms are given. The first corresponds to equal proportions and covariance matrices forx in R^{n}while the second yields to a general mixture andx in R^{2}. These conditions may be useful in proving nonhomogeneity of random vectors in the reduction of the... View full abstract»

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  • Comments on "Pole assignment and determination of the residual polynomial"

    Publication Year: 1980, Page(s):853 - 855
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (282 KB)

    In the above paper a method is given for determining the output vector feedback, simultaneously computing the coefficients of the residual polynomial, the roots of which are the remaining unassigned poles. This and similar results are well established but not well known in the western literature. In these comments two algorithms are reported for the incomplete pole assignment by output feedback; w... View full abstract»

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  • Comments on "A computer-aided root-locus method"

    Publication Year: 1980, Page(s): 855
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    First Page of the Article
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  • Comments on "Two-level form of Kalman filter"

    Publication Year: 1980, Page(s):856 - 857
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (175 KB)

    A two-level method of state estimation proposed by Noton is demonstrated to give only an approximate solution, not an exact one, to filtering problems. View full abstract»

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  • Comments on "A new lower bound on the cost of optimal regulators"

    Publication Year: 1980, Page(s):857 - 858
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (154 KB)

    The purpose of this correspondence is to point out that the result of the above paper is incorrect. View full abstract»

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  • [Back cover]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • On parameter and structural identifiability: Nonunique observability/reconstructibility for identifiable systems, other ambiguities, and new definitions

    Publication Year: 1980, Page(s):830 - 833
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A number of inconsistencies, misunderstandings and ambiguities have arisen in the recent literature regarding identifiability concepts, evidenced in part by the number of "point-counterpoint" notes and comments published on this subject. It appears that the problem is due fundamentally to a lack of a unified set of definitions. A partially new, simple and hopefully complete set of definitions is p... View full abstract»

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  • On Chuang's continued fraction method of model reduction

    Publication Year: 1980, Page(s):822 - 824
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    Based on Chuang's continued fraction method of model reduction, an algorithm for obtaining the reduced order model of linear time-invariant system from its state-space model directly, without requiring to determine the corresponding transfer function, has been suggested. The algorithm can also be used for determining the transfer function from the state-space model. View full abstract»

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  • Improved extended Kalman filter design for passive tracking

    Publication Year: 1980, Page(s):807 - 811
    Cited by:  Papers (47)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    Extended Kalman filters are here modified for coordinate estimation of a stationary object using bearing measurements taken from a moving platform. The modifications improve significantly the coordinate estimation on the initial period of data collection when otherwise the performance is far from optimal. The modifications are to the nonlinearities and could, in some instances, be implemented by t... View full abstract»

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  • Periodic oscillations of matrix Riccatti equations in time-invariant systems

    Publication Year: 1980, Page(s):749 - 755
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Periodic oscillations arising in matrix Riccati equntions having constant coefficient matrices are investigated in this paper. The algorithm deriving such periodic solutions and the condition for their existence are obtained. Since matrix Riccati equations play a crucial role in optimal estimation and control theories, tn scattering theory, and in other important applications, the stability of sol... View full abstract»

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  • Unification of some discrete-time adaptive control schemes

    Publication Year: 1980, Page(s):693 - 697
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Adaptive control can be approached from many different points of view. In recent years there has been much progress made both on model reference adaptive systems (MRAS's) and on self-tuning regulators (STR's). The two approaches are treated here in a general framework. It is shown that MRAS's can be derived from the STR point of view. Special attention is paid to the positive real condition, which... View full abstract»

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  • On the numerical solution of the discrete-time algebraic Riccati equation

    Publication Year: 1980, Page(s):631 - 641
    Cited by:  Papers (187)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    In this paper we shall present two new algorithms for solution of the diserete-time algebraic Riccati equation. These algorithms are related to Potter's and to Laub's methods, but are based on the solution of a generalized rather than an ordinary eigenvalue problem. The key feature of the new algorithms is that the system transition matrix need not be inverted. Thus, the numerical problems associa... View full abstract»

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  • A multiple model adaptive dual control algorithm for stochastic systems with unknown parameters

    Publication Year: 1980, Page(s):703 - 710
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    An adaptive dual control algorithm is presented for linear stochastic systems with constant but unknown parameters. The system parameters are assumed to belong to a finite set on which a prior probability distribution is available. The tool used to derive the algorithm is preposterior analysis: a probabilistic characterization of the future adaptation process allows the controller to take advantag... View full abstract»

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  • Performance of adaptive estimation algorithms in dependent random environments

    Publication Year: 1980, Page(s):788 - 794
    Cited by:  Papers (87)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    We consider the convergence properties of certain algorithms arising in stochastic, discrete-time, adaptive estimation problems and operating in random environments of engineering significance. We demonstrate that the algorithms operating under ideal conditions are describable by homogeneous time-varying linear difference equations with dependent random coefficients, while in practical use, these ... View full abstract»

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  • Computer control algorithms for a tubular ammonia reactor

    Publication Year: 1980, Page(s):642 - 651
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    The specific objective of this paper is to develop direct digital control strategies for an ammonia reactor using the quadratic regulator theory and compare the performance of the resultant control system with that under conventional PID regulators. The controller design studies are based on a ninth-order state-space model obtained from the exact nonlinear distributed model using linearization and... View full abstract»

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  • Principle of vibrational control: Theory and applications

    Publication Year: 1980, Page(s):755 - 762
    Cited by:  Papers (105)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The principle of vibrational control is presented. This principle consists in the introduction of such vibrations (with zero mean value) of the dynamic system parameters which modify the properties of the system in a desired manner. Unlike conventional control principles, vibrational control does not require measurements of deviations and disturbances. Classes of dynamic systems are described wher... 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