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IEEE Transactions on Automatic Control

Issue 4 • Date 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
  • 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 for x \in R^{n} while the second yields to a general mixture and x \in R^{2} . These conditions may be useful in pr... 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
  • Checkable conditions for identifiability of linear systems operating in closed loop

    Publication Year: 1980, Page(s):722 - 729
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Necessary and sufficient conditions are given for the identifiability of the open-loop transfer functions for linear discrete time systems operating in closed loop. It is shown that, provided certain structural constraints are satisfied, it is necessary and sufficient that the noise covariance matrix Σ associated with any spectral factorization of the joint input-output spectral density be bl... View full abstract»

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  • Necessary and sufficient conditions for delay-independent stability of linear autonomous systems

    Publication Year: 1980, Page(s):735 - 739
    Cited by:  Papers (74)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Strict quasi-diagonal dominance of the system matrix is known to be sufficient for a linear autonomous system with arbitrary time delays in off-diagonal interactions to be stable. A small perturbation of the matrix yields a perturbed system with the same dominance, and, hence, stability properties. In this paper, it is shown that quasi-diagonal dominance is also necessary for stability with respec... View full abstract»

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  • Impact of storage on load management by utilities

    Publication Year: 1980, Page(s):685 - 689
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    In this paper we study the impact of storage on load management by electric utilities. The results we have obtained are based on a simple model with linear storage costs and quadratic generating costs. Inefficiency of storage is a parameter in the model. An optimal control problem, with state variable and control variable inequality constraints, is formulated. It is shown that the optimal storage/... 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 (183)
    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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  • Guaranteed avoidance feedback control

    Publication Year: 1980, Page(s):850 - 851
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    We consider a dynamical system under the control of two agents, one of whom desires to keep the system's state out of a given set regardless of the other agent's actions. The guaranteed avoidance conditions of [1] are generalized to admit "piecewise C1" test functions; this generalization permits application to a wider class of problems. 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 (768 KB)

    In this paper we treat a specific two-person, zero-sum, dynamic game of the type x_{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 proble... View full abstract»

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  • A simple dynamic routing problem

    Publication Year: 1980, Page(s):690 - 693
    Cited by:  Papers (147)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    As jobs arrive they have to be routed to one of two similar exponential servers. It is shown that if the queue lengths at both servers are observed then the Optimal decision is to route jobs to the shorter queue, whereas if the queue lenths are not observed then it is best to alternate between queues, provided the initial distribution of the two queue sizes is the same. The optimality of these rou... 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 (86)
    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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  • On robustness of the stability of feedback systems

    Publication Year: 1980, Page(s):817 - 818
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The problem is posed of when a stable feedback system remains stable under small perturbation of the plant. Several different notions of small perturbation are proposed, all for operator-type plant models, and the robustness question is settled for these notions. View full abstract»

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  • A new scalar equivalence for Pareto optimization

    Publication Year: 1980, Page(s):829 - 830
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A new scalar equivalence is presented for Pareto optimization. This equivalence involves the maximization of a real-valued function subject to parametric constraints. The method extends to maximizations defined in terms of polyhedral cones. View full abstract»

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  • A reduced-delay sampled-data hold

    Publication Year: 1980, Page(s):847 - 850
    Cited by:  Papers (3)
    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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  • 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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  • 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 (312 KB)

    A new concept of "eigenvalues" and "eigenvectors" of A(t) is introduced. This new concept reduces to the conventional one as a special case when A(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 (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 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 matrix Q is 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 alg... 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 (31)
    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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  • Adaptive control via adaptive observation and asymptotic feedback matrix synthesis

    Publication Year: 1980, Page(s):717 - 722
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    For unknown linear, time invariant systems an adaptive feedback control scheme is established. It is composed of a stable adaptive state and parameter observation part, and a stable asymptotic synthesis of an adaptive feedback matrix part, the latter based on the current parameter estimates. Both adaptive state feedback control and adaptive feedback control, using the adaptively observed state ins... 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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  • 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 (528 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 ... 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