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 (48)
    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 (6)
    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 (20)
    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 (5)
    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
  • An extension of a stability theorem applicable to adaptive control

    Publication Year: 1980, Page(s):814 - 817
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (336 KB)

    In [1] explicit conditions are given for model reference adaptive systems (MRAS's) with a general type adaptation algorithm in order to assure the giobal asymptotic stability of the error used for adaptation. However, important information about the behavior of various other variables (i.e., parameter errors, observation vector entering in the adaptation algorithm) can also be obtained. All these ... View full abstract»

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  • 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 (63)
    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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  • Optimal periodic control: The π test revisited

    Publication Year: 1980, Page(s):673 - 684
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1000 KB)

    The paper examines second-order conditions for both steady-state and dynamic optimality in a periodic control problem. It centers on the π condition of Bittanti, Fronza, and Guardabassi [2] and has three main objectives: 1) to form a π "test" for a somewhat more general problem than considered in [2]; 2) to point out that certain auxiliary conditions must be added if the results of [2] a... View full abstract»

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  • Necessary and sufficient conditions for detectability of jumps in linear systems

    Publication Year: 1980, Page(s):833 - 834
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (280 KB)

    Necessary and sufficient conditions for detectability of abrupt changes of unknown magnitude in inputs, outputs, and states of linear systems are derived. Results indicate the minimum number of sensors necessary for detection of different types of hypothesized jumps. View full abstract»

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  • A reduced-delay sampled-data hold

    Publication Year: 1980, Page(s):847 - 850
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    A data holding scheme whose phase delay is significantly less than that of the usual zero-order-hold is presented. Lower sampling rates may thus be used in closed-loop control applications. The improvement is achieved by means of simple additional software. A standard ZOH device is employed. Graphs of the resulting frequency response are presented. An example is included. View full abstract»

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  • Principle of vibrational control: Theory and applications

    Publication Year: 1980, Page(s):755 - 762
    Cited by:  Papers (119)
    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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  • The effects of feedback delays on the performance of multivariable linear control systems

    Publication Year: 1980, Page(s):729 - 735
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (688 KB)

    This short paper presents the sufficient conditions of stability of the linear systems with delays in such a form that they enable evaluation of the exponential upper bound of the transients of the system in question. Next, the paper yields a method of evaluation of a loss of the value of a quadratic performance index due to the delays in the system. Furthermore, the paper gives a proposal of an i... View full abstract»

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  • Ultra fast state estimation for the large electric power system

    Publication Year: 1980, Page(s):839 - 841
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (320 KB)

    A reorganized solution of the state estimation problem is proposed which takes advantage of dedicated microprocessors at the local buses to circumvent interacting solutions of the power flow equations. The latter makes conventional state estimation much too time consuming for on-line use in emergencies. 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 (33)
    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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  • Approximations to unsupervised filters

    Publication Year: 1980, Page(s):842 - 847
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (464 KB)

    The problem of recursive estimation of an additive noise-corrupted discrete stochastic process is considered for the case where there is a nonzero probability that the observation does not contain the process. Specifically, it is assumed that, independently, with unknown, constant probabilities, observations consist either of pure noise, or derive from a discrete linear process, and that the true ... View full abstract»

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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