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Automatic Control, IEEE Transactions on

Issue 3 • Date June 1982

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Displaying Results 1 - 25 of 51
  • [Front cover]

    Publication Year: 1982 , Page(s): 0
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    Freely Available from IEEE
  • Editorial: Outstanding AC transactions paper awards

    Publication Year: 1982 , Page(s): 521
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  • Comments on "Decentralization, stabilization, and estimation of large scale linear systems"

    Publication Year: 1982 , Page(s): 747 - 748
    Cited by:  Papers (3)
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    It is shown here that the input decentralization scheme for the large scale linear system presented by Siljak and Vukcevic does not always result in interconnected subsystems controlled by local (scalar) inputs. View full abstract»

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  • Author's reply

    Publication Year: 1982 , Page(s): 748
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    First Page of the Article
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  • Correction to "Homogeneous interconnected systems: An example"

    Publication Year: 1982 , Page(s): 748
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1982 , Page(s): 0
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    Freely Available from IEEE
  • Gradient computation in prediction error identification of linear discrete-time systems

    Publication Year: 1982 , Page(s): 738 - 739
    Cited by:  Papers (2)
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    A dynamic programming formulation is used to derive efficient expressions for the gradient of the identification criterion with respect to the parameters of a linear time-invariant system. These expressions reduce the computational costs of the parameter optimization step in prediction error identification. View full abstract»

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  • On stabilization by local state feedback for discrete-time large-scale systems with delays in interconnections

    Publication Year: 1982 , Page(s): 744 - 746
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB)  

    By employing an extended Nyquist array technique, a sufficient condition is obtained for decentralized stabilization of a class of discrete-time large-scale systems with delays in interconnections. View full abstract»

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  • On the relation between stable matrix fraction factorizations and regulable realizations of linear systems over rings

    Publication Year: 1982 , Page(s): 627 - 638
    Cited by:  Papers (38)
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    Various types of transfer matrix factorizations are of interest when designing regulators for generalized types of linear systems (delay differential, 2-D, and families of systems). This paper studies the existence of stable and of stable proper factorizations, in the context of the theory of systems over rings. Factorability is related to stabilizability and detectability properties of realizations of the transfer matrix. View full abstract»

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  • Electrostatically figured reflecting membrane antennas for satellites

    Publication Year: 1982 , Page(s): 666 - 670
    Cited by:  Papers (14)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    A design concept is described which may permit the construction of very large high-precision low-mass reflecting antennas for use in space. The concept utilizes electrostatic forces to actively shape a flexible membrane reflector, a method which appears to substantially reduce the number of reflector figure actuators required to achieve a specified reflector surface precision. The concept presents a challenging control problem, however, because the equilibrium reflector figure may exhibit several open-loop Rayleigh-Taylor modal instabilities. The origin and essential elements of this control problem are described and a control approach is proposed. A laboratory demonstration of three successfully stabilized modes on a meter-square membrane is also described which suggests that electrostatically figured satellite antennas with diameters reaching several hundred meters, and ratios of focal length to diameter as small as one, could achieve beamwidths of several arc seconds. View full abstract»

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  • Response bounds for asymptotically stable time-invariant linear dynamical systems

    Publication Year: 1982 , Page(s): 704 - 706
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    A theorem of Strang [1] is extended to provide the best possible lower eigenvalue bound for a certain positive semidefinite matrix. The results are then applied to several asymptotically stable time-invariant linear systems. Some cases in which the bounds become infinite are discussed. View full abstract»

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  • Computational aspects of discrete time adaptive control

    Publication Year: 1982 , Page(s): 722 - 725
    Cited by:  Papers (1)
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    Stable model reference adaptive control schemes for discrete time systems can be designed which take into account computational time and limited range of computing machines. An algorithm is developed using Lyapunov second method and properties of strictly positive real functions. View full abstract»

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  • On the selection of the eigenvalues to be retained in the reduced order models

    Publication Year: 1982 , Page(s): 688 - 690
    Cited by:  Papers (2)
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    This note points out that the model order selection criteria proposed earlier for Davison's and Marshall's reduced order models are not applicable in many of the practical cases. A new criterion is proposed to overcome the deficiencies of the earlier methods. View full abstract»

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  • Asymptotic agreement in distributed estimation

    Publication Year: 1982 , Page(s): 650 - 655
    Cited by:  Papers (62)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    Each of several agents updates his estimate of the same random variable whenever he makes a new observation or receives the estimate made by another agent. In turn, each agent transmits his estimate to a randomly chosen subset of the other agents. A subset of agents forms a communicating ring if for every pair \underline {m}, \underline {p} of ring members, there is a sequence of ring members \underline {m} = \underline {m}_{1}, \underline {m}_{2}, ... , \underline {m}_{n+1} = \underline {p} such that \underline {m}_{i} sends his estimate to \underline {m}_{i+1} infinitely often. If each ring member knows that he is a ring member, then the estimates of all the ring members asymptotically agree. However, this common limit can depend upon the order in which estimates are transmitted. View full abstract»

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  • The design of strip shape control systems for Sendzimir mills

    Publication Year: 1982 , Page(s): 656 - 666
    Cited by:  Papers (10)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (872 KB)  

    A multivariable design technique is described for use in the design of strip shape control systems. The main control problem stems from the uncertainty in the knowledge of the mill gain matrix. The effect of modeling errors is to introduce interaction into the imperfectly compensated system. The design technique involves squaring down the system to make it more robust in the presence of such errors. The approximately upper triangular form of the transformed system enables a simple precompensator to be designed and the system is shown to be stable over a wide range of line speeds. View full abstract»

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  • Parameterization of the class of deadbeat controllers

    Publication Year: 1982 , Page(s): 727 - 729
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    This technical note deals with the problem of parameterizing the class of deadbeat controllers for a given system through the minimum of parameters. It is shown that if n and m are dimensions of the state vector and control vector, respectively, and the μi's are the controllability indexes, then almost the whole class of deadbeat controllers is explicitly parameterizable through mn-\mu_{1} - 3\mu_{2} - ... -(2m - 1)\mu_{m} parameters. View full abstract»

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  • Optimal control of service in tandem queues

    Publication Year: 1982 , Page(s): 600 - 610
    Cited by:  Papers (34)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1104 KB)  

    Customers arrive in a Poisson stream into a network consisting of two M/M/1 service stations in tandem. The service rate u \in [0, a] at station 1 is to be selected as a function of the state ( x_{1}, x_{2} ) where xiis the number of customers at station i so as to minimize the expected total discounted or average cost corresponding to the instantaneous cost c_{1}x_{1} + c_{2}x_{2} . The optimal policy is of the form u=a or u=0 according as x_{1} < S(x_{2}) or x_{1} \geq S(X_{2}) and S is a switching function. For the case of discounted cost, the optimal process can be nonergodic, but it is ergodic for the case of average cost. View full abstract»

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  • On the role of the interactor matrix in multiinput-multioutput adaptive control

    Publication Year: 1982 , Page(s): 713 - 714
    Cited by:  Papers (3)
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    Recent papers have shown that the system interactor matrix plays an important role in the multiinput-multioutput adaptive control. In these papers, however, the impression may have been inadvertently conveyed that the interactor matrix can be taken to be diagonal in almost all cases. This note shows that this impression is false and that, in general, a nondiagonal interactor matrix should be considered. View full abstract»

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  • Synthesis of the decentralized robust servomechanism problem using local models

    Publication Year: 1982 , Page(s): 583 - 600
    Cited by:  Papers (12)
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    This paper is concerned with the solvability and controller synthesis of the robust servomechanism problem for a decentralized system subject to the constraint that each control agent of the system possesses only a limited knowledge of the model of the system to be regulated, i.e., typically, each agent of a large-scale system possesses only a local model of the system, which may be different from each other and generally is incomplete. The question to be asked then is: given that each control agent does not possess a model of the complete large-scale system to be regulated, but only a partial model of the complete system, and given that there exists no central decision making authority, to what extent can one solve the decentralized robust servomechanism problem for the system in a sequential stable way [1]? It will be shown that there exists a solution to this decentralized synthesis problem if and only if there exists a solution to the decentralized robust servomechanism problem. A constructive algorithm for synthesizing a controller to solve this decentralized problem in this case is given. Some simple numerical examples are given to illustrate the results. View full abstract»

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  • On eigenstructure assignment in linear multivariable systems

    Publication Year: 1982 , Page(s): 690 - 693
    Cited by:  Papers (35)
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    The eigenvalue-assignment approach of Brogan [1], [2] is generalized and extended to the assignment of the entire closed-loop eigenstructure of linear multivariable systems. The set of assignable eigenvectors and generalized eigenvectors emerges naturally in the solution and is given, moreover, in an explicit parametric form. Two numerical examples are worked out to demonstrate the application of the procedure. View full abstract»

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  • Distributed dynamic programming

    Publication Year: 1982 , Page(s): 610 - 616
    Cited by:  Papers (29)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (696 KB)  

    We consider distributed algorithms for solving dynamic programming problems whereby several processors participate simultaneously in the computation while maintaining coordination by information exchange via communication links. A model of asynchronous distributed computation is developed which requires very weak assumptions on the ordering of computations, the timing of information exchange, the amount of local information needed at each computation node, and the initial conditions for the algorithm. The class of problems considered is very broad and includes shortest path problems, and finite and infinite horizon stochastic optimal control problems. When specialized to a shortest path problem the algorithm reduces to the algorithm originally implemented for routing of messages in the ARPANET. View full abstract»

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  • Uniqueness of the maximum likelihood estimates of ARMA model parameters--An elementary proof

    Publication Year: 1982 , Page(s): 736 - 738
    Cited by:  Papers (5)
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    Under mild conditions, the likelihood function associated with an ARMA model asymptotically has a unique stationary point which is a global maximum corresponding to the true parameter values. This note gives a new proof of this fact. The proof is considerably simpler than that previously published. View full abstract»

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  • Trends in large space structure control theory: Fondest hopes, wildest dreams

    Publication Year: 1982 , Page(s): 522 - 535
    Cited by:  Papers (124)  |  Patents (1)
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    This paper presents a mathematical framework for discussion of large space structure (LSS) control theory. Within this framework, current trends in LSS control theory and related topics in general control science are surveyed. View full abstract»

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  • Constrained max-min controllability

    Publication Year: 1982 , Page(s): 731 - 733
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    The max-min controllability concept of Heymann, Pachter, and Stern [1] is examined for a more general class of problems. Both strong and weak max-min controllability are characterized. It is shown that when magnitude constraints on the control are present, the two max-min controllability concepts are not the same. This differs from the result for problems without control magnitude constraints where it has been shown that the two controllability concepts are identical. View full abstract»

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  • Planar regions of attraction

    Publication Year: 1982 , Page(s): 708 - 710
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    An effective method for estimation of the region of attraction of an equilibrium point in the plane is proposed in this note. This new method for stability analysis of the second-order nonlinear system \dot{x} = f(x) ; x(t_{0})=x_{0} , is based on the properties of phase flows and associated velocity fields. Several engineering examples have been solved which illustrate the usefulness of the technique. 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