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Automatic Control, IEEE Transactions on

Issue 5 • Date October 1978

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Displaying Results 1 - 25 of 53
  • [Front cover and table of contents]

    Publication Year: 1978 , Page(s): 0
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    Freely Available from IEEE
  • In memoriam - Nasser E. Nahi, 1933-1978

    Publication Year: 1978 , Page(s): 769
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    Freely Available from IEEE
  • Comments on "On the design of single-loop single-input-output feedback control systems in the complex-frequency domain"

    Publication Year: 1978 , Page(s): 963 - 965
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    The practical work impossibility of some controllers designed by Bongiorno and Youla, and the inadmissibility in the design, ignoring some old-theory categories, are demonstrated. View full abstract»

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  • Comments on "On the relationships between structural identifiability and the controllability, observability properties"

    Publication Year: 1978 , Page(s): 965 - 966
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (232 KB)  

    First Page of the Article
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  • Author's reply

    Publication Year: 1978 , Page(s): 966 - 967
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1978 , Page(s): 0
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    Freely Available from IEEE
  • Markov image modeling

    Publication Year: 1978 , Page(s): 846 - 850
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    The theory of two-dimensional spectral factorization is reviewed in the context of recursive modeling. The role of the Markov random field in recursive image modeling is then presented. Since spectral factorization in two or higher dimensions generally results in infinite-order factors, it is necessary to perform Markov modeling after spectral factorization. The above concepts are then applied to the problem of Kalman filtering of images. View full abstract»

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  • Error analysis of three-dimensional linear diffusion equations when approximated to differential-difference equations

    Publication Year: 1978 , Page(s): 962 - 963
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    This correspondence attempts to investigate the error involved when three-dimensional linear diffusion equations are approximated to differential difference equations. View full abstract»

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  • On the synthesis of a third-order time-fuel-optimal control system

    Publication Year: 1978 , Page(s): 952 - 954
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    The problem of synthesizing controls which minimize a linear functional of time and fuel is considered. A triple integrator system is treated, and the optimal synthesis is obtained by exploiting a scaling property of the system which facilitates analysis in a two-dimensional reduced state space (Fuller [6]). View full abstract»

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  • A simple derivation of the gradient conditions for optimal constant output feedback gains

    Publication Year: 1978 , Page(s): 937 - 938
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (176 KB)  

    A simple and direct derivation of necessary conditions for optimality of output feedback gains for a linear time-invariant system is presented. The dependence of the cost on the initial state x(0) is eliminated by the well-known technique of averaging the initial state over the surface of the n -dimensional unit sphere. View full abstract»

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  • On alternative methodologies for the design of robust linear multivariable regulators

    Publication Year: 1978 , Page(s): 930 - 933
    Cited by:  Papers (19)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    This paper presents two synthesis algorithms which embody the two major variants of the numerous methodologies which have been proposed for the design of multivariable linear regulators which exhibit the property of disturbance rejection with or without additional robustness qualities. It is shown that these two procedures generally lead to substantively different compensator structures. View full abstract»

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  • Further comments on "On the relationships between structural identifiability and the controllability, observability properties"

    Publication Year: 1978 , Page(s): 966 - 967
    Cited by:  Papers (1)
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    DiStefano's counterexample purporting to show that controllability and observability of linear systems are not necessary for identifiability is a special case which does not invalidate the general conclusion. View full abstract»

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  • A general criterion for jump resonance of nonlinear control systems

    Publication Year: 1978 , Page(s): 896 - 901
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    A new criterion for jump resonance of nonlinear control systems is presented. The jump resonance phenomenon is classified into various types according to the form of the frequency response curve, some of which are new and not found in the previous publications. A simple graphical method to predict each type of jump resonance is studied. Experimental results by analog simulation are shown. View full abstract»

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  • Desensitizing constant gain feedback linear regulators

    Publication Year: 1978 , Page(s): 933 - 936
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    A two-stage process is proposed for the design of low-sensitivity constant gain feedback linear regulators. In the first stage nominal parameter values are assumed and a model response is obtained. Plant parameter variations are taken into account in the second stage, and a sensitivity reduction algorithm is described in which a performance index which includes a model-following term is to be minimized. The computer solution of the feedback matrix is obtained using a gradient search method, and a fourth-order aircraft flight control example illustrates the design's capabilities. View full abstract»

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  • Stabilizability, detectability, and spectrum assignment for linear autonomous systems with general time delays

    Publication Year: 1978 , Page(s): 887 - 890
    Cited by:  Papers (69)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB)  

    A general linear autonomous system with both discrete and distributed delays in state and control variables is considered and an open-loop stabilizability problem is posed. It is proven that a simple algebraic rank condition, similar to the well-known Hautus condition, is necessary for open-loop stabilizability. This condition is also shown to be sufficient by constructing a proper stabilizing state feedback. The detectability problem for systems with general state and output delays is proven to be dual to state-feedback stabilizability of a transposed system with state and control delays. If the delays appear in control variables only the state-feedback spectrum assignability is equivalent to formal controllability of a certain pair of real matrices and, equivalently, to system state controllability. View full abstract»

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  • Square-root algorithms for the continuous-time linear least-square estimation problem

    Publication Year: 1978 , Page(s): 907 - 911
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    We present a simple differential equation for the triangular square root of the state error variance of the continuous-time Kalman filter. Unlike earlier methods of Andrews, and Tapley and Choe, this algorithm does not explicitly involve any antisymmetric matrix in the differential equation for the square roots. The role of antisymmetric matrices is clarified: it is shown that they are just the generators of the orthogonal transformations that connect the various square roots; in the constant model case, a similar set of antisymmetric matrices appears inside the Chandrasekhar-type equations for the square roots of the derivative of the error variance. Several square-root algorithms for the smoothing problem are also presented and are related to some well-known smoothing approaches. View full abstract»

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  • Convergence analysis of parametric identification methods

    Publication Year: 1978 , Page(s): 770 - 783
    Cited by:  Papers (91)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1360 KB)  

    A certain class of methods to select suitable models of dynamical stochastic systems from measured input-output data is considered. The methods are based on a comparison between the measured outputs and the outputs of a candidate model. Depending on the set of models that is used, such methods are known under a variety of names, like output-error methods, equation-error methods, maximum-likelihood methods, etc. General results are proved concerning the models that are selected asymptotically as the number of observed data tends to infinity. For these results it is not assumed that the true system necessarily can be exactly represented within the chosen set of models. In the particular case when the model set contains the system, general consistency results are obtained and commented upon. Rather than to seek an exact description of the system, it is usually more realistic to be content with a suitable approximation of the true system with reasonable complexity properties. Here, the consequences of such a viewpoint are discussed. View full abstract»

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  • The use of harmonic analysis in suboptimal estimator design

    Publication Year: 1978 , Page(s): 911 - 916
    Cited by:  Papers (4)
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    The state estimation problem for bilinear stochastic systems evolving on the spheres Sn, the special orthogonal groups SO(n) , and certain other compact Lie groups and homogeneous spaces is considered. The problem is motivated by some applications involving rotational processes in three dimensions. The theory of harmonic analysis on compact Lie groups is used to define assumed density approximations which result in implementable suboptimal estimators for the state of the bilinear system. The results of Monte Carlo simulations are reported; these indicate that simple filters designed by these techniques perform well as compared to other filters. View full abstract»

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  • Stabilization and regulation in linear multivariable systems

    Publication Year: 1978 , Page(s): 928 - 930
    Cited by:  Papers (12)
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    This paper presents a generalization of some recent results of Cheng and Pearson [1]. It is shown that the conditions obtained under certain assumptions in [1] are valid under more general assumptions. We therefore obtain the solution to a more general linear multivariable regulator problem than that previously solved by Wonham and Pearson [2]. View full abstract»

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  • Filtering and error analysis via the UDU^{T} covariance factorization

    Publication Year: 1978 , Page(s): 901 - 907
    Cited by:  Papers (9)
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    Kalman filter algorithms based on the UDUTcovariance factorization are discussed, with special attention given to algorithm implementation efficiency. A U-D factored covariance error analysis algorithm is formulated, and its efficiency and numerical stability are demonstrated in a representative orbit determination problem. The numerical results are compared with those obtained using covariance error analysis formulae, and the comparison highlights the numerical superiority of our algorithm A by-product of the U-D analysis is a new, highly efficient algorithm mechanization of the arbitrary gain covariance update formula. View full abstract»

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  • Routh approximations using the Schwarz canonical form

    Publication Year: 1978 , Page(s): 940 - 941
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    Reduced-order models are derived using the Schwarz canonical form description for the high-order system together with the Routh stability criterion. The reduced models have the property that they will be stable if the original high-order system is stable. Further, the initial time moments of the system and model are equal. View full abstract»

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  • Estimation-detection of object boundaries in noisy images

    Publication Year: 1978 , Page(s): 834 - 846
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1656 KB)  

    Estimation of boundaries of objects in noisy images is considered when the objects and the background are statistically characterized. The noise is assumed white, additive, and Gaussian. Optimal recursive estimators in a joint estimation-detection context are derived. Applications to binary pictures are illustrated. View full abstract»

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  • Dynamic representation and recursive estimation of cyclic and two-dimensional processes

    Publication Year: 1978 , Page(s): 801 - 809
    Cited by:  Papers (18)
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    Autoregressive-moving average dynamic models are construtted for nonstationary processes which exhibit cyclic behavior. Recursive linear mean-square prediction and filtering policies are then formulated which utilize these models. Application to a problem in two-dimensional image restoration is considered in detail. View full abstract»

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  • Adaptive implementation of one-step-ahead optimal control via input matching

    Publication Year: 1978 , Page(s): 865 - 872
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (912 KB)  

    Directly adapting feedback control parameters to match an optimal input avoids the current limitations of indirect adaptive control and direct adaptive model matching. This original concept, termed input matching, allows combination of stable parameter adjustment algorithms and optimal performance considerations. Furthermore, the emphasis on input matching permits consistent control despite inconsistent parameter identification obviating efforts such as test or probing inputs required to ensure consistent identification. The control signal is reduced to a constant weighted sum of the measurable information-state vector components by the use of a one-step-ahead quadratic cost function to govern the behavior of a linear, time-invariant multivariable plant. The control effort from this linear combination proves globally estimable by a vector equation error formulation since the one-step-ahead cost function permits simple a posteriori input error calculation. Several simulations demonstrate the behavior of this new multivariable adaptive input matching control method. View full abstract»

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  • An improved adaptive identifier for discrete multivariable linear systems

    Publication Year: 1978 , Page(s): 860 - 865
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    It is shown that the Kudva-Narendra method for recursive identiffication of discrete-time linear multivariable systems may be modified to allow possibly improved convergence during the initial stages, finite convergence, or the use of a priori information about the parameter estimates. The modification entails orthogonal projection of the vector of system states and inputs used for excitation of the adaptation equations and does not impair the stability of the original identifier. Examples illustrating various aspects of the modification are given. 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