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Automatic Control, IEEE Transactions on

Issue 12 • Date December 1984

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Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Publication Year: 1984 , Page(s): 0
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    Freely Available from IEEE
  • Comments on "On the application of matrix generalized inverses to the design of observer for time-varying and time-invariant linear systems"

    Publication Year: 1984 , Page(s): 1125 - 1126
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (187 KB)  

    It is shown by counterexample that the correction paper [1] of the paper is incorrect. Following a definition and a theorem, we present a corrected version of the authors' theorem to make the results of the paper precise. View full abstract»

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  • Author's reply

    Publication Year: 1984 , Page(s): 1126 - 1127
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    First Page of the Article
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  • Comments on "Eigenstructure assignment in linear multivariable systems - A parametric solution

    Publication Year: 1984 , Page(s): 1128
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    The approaches to eigenstructure assignment in [1]-[3] and the above paper are shown to be equivalent. View full abstract»

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  • Author's reply [to "Comments on 'Eigenstructure assignment in linear multivariable systems - A parametric solution'" by M.M. Fahmy and J. O'Reilly]

    Publication Year: 1984 , Page(s): 1128 - 1129
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    The authors reply that Klein is correct in his observation that the approaches to eigenstructure assignment in earlier articles by B. C. Moore (1976), G. Klein and Moore (1977) are equivalent to those of the authors. They assert, however, that their philosophies are quite different. These differences are then described. View full abstract»

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  • Comments on "Algebraic design techniques for reliable stabilization"

    Publication Year: 1984 , Page(s): 1129 - 1130
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    If a doubly-coprime factorization for the plant is chosen then both the r.c.f, and I.c.f. of the stabilizing controller can be given in terms of one and the same parameter. View full abstract»

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  • Comments on "On structural controllability theorem"

    Publication Year: 1984 , Page(s): 1130 - 1131
    Cited by:  Papers (1)
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    In the above mentioned paper, Mayeda gave an elegant proof to the structural controllability theorem. This note suggests further simplification of that proof using graph-theoretic interpretation of some determinants. View full abstract»

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  • Comments on "Smith forms over R[z1, z2]

    Publication Year: 1984 , Page(s): 1131
    Cited by:  Papers (1)
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    It is pointed out that a proof of a result in the above paper is incorrect. However, the result is well known, and its correct proof is available in the existing mathematical literature concerning Serre's conjecture. View full abstract»

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  • Extensions of linear-quadratic control, optimization and matrix theory (Jacobson, D.H.; 1977)

    Publication Year: 1984 , Page(s): 1132 - 1133
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1984 , Page(s): 0
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    Freely Available from IEEE
  • Control of linear systems with fixed noncommensurate point delays

    Publication Year: 1984 , Page(s): 1083 - 1090
    Cited by:  Papers (4)
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    The First solution is given to the fundamental open problem of stabilizability and detectability (necessary sufficient conditions for internal stabilization by feedback) of retarded and a large class of neutral delay-differential systems with several fixed, noncommensurate point delays, using causal compensators (observers and state-feedback or dynamic output feedback), which are also the same type of neutral or retarded delay-differential systems with fixed point delays only. Our results are rank conditions on the system matrices [ zI - F:G ] and [ zIF^{T}:H^{T} ] evaluated at points in the complex plane and are the weakest possible generally applicable sufficient such rank conditions for stabilization of neutral systems in the light of what is known on the stability of such systems. These conditions are necessary for most practical purposes. The class of systems we consider includes all retarded delay-differential systems with noncommensurate, fixed point delays. In the case of retarded systems, these rank conditions are necessary and sufficient conditions for stabilization via compensators which are causal retarded delay-differential systems with fixed point delays only. These constitute the first full solution of these previously unsolved problems of stabilizability and detectability (which, together, are necessary and sufficient conditions for internal stabilization by feedback) for delay-differential systems even in the retarded single fixed point delay case. An application of our results to a problem of practical importance in control of linear systems with no delays provides a stabilization criterion interesting in itself. View full abstract»

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  • Prior information in the design of multivariable adaptive controllers

    Publication Year: 1984 , Page(s): 1108 - 1111
    Cited by:  Papers (28)
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    This note discusses the design of a dynamic precompensator W_{c}(s) for an m \times m MIMO plant W_{p}(s) such that, for almost all cases, W_{p}(s)W_{c}(s) has a diagonal Hermite form. View full abstract»

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  • Feedback controllers for a wind tunnel model involving a delay: Analytical design and numerical simulation

    Publication Year: 1984 , Page(s): 1058 - 1068
    Cited by:  Papers (13)
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    An application of a finite spectrum assignment method for time-delay systems to a feedback control of Mach number in a wind tunnel is presented. The linearized model of Mach number control is a system of three state equations with a delay in one of the state variables. The proposed feedback is a linear combination of state variables and weighted integrals of some of the state variables over a period equal to time delay. The spectrum of the closed-loop system is finite and consists of three eigenvalues that can be placed arbitrarily. Four possible variants of the feedback control law are presented. The calculation of feedback coefficients is very simple, which makes it possible to update the controller's parameters on-line with the changes of the operating point. An extensive numerical simulation of the system dynamics and the feedback controllers was done and led to several conclusions. In particular, a very good settling time under problem constraints has been obtained, and several nice features of the proposed feedback controller have been demonstrated. View full abstract»

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  • Linear stochastic control with constraints

    Publication Year: 1984 , Page(s): 1100 - 1103
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    This paper concerns the control of some process driven by linear stochastic equation with a quadratic cost and an average quadratic constraint. The constraint can be for example a limitation of the average energy consumption. The existence of an optimal control is proved and an approximate solution is constructed. View full abstract»

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  • Model updating improves MRAC performance

    Publication Year: 1984 , Page(s): 1106 - 1108
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    The performance of an MRAC design can be improved by using the model-updating concept, which places the state of the system into the reference model at regular time intervals. This paper discusses criteria for determining this updating and a proof is given to show that model updating does not influence the stability properties of an MRAC design. A typical example indicates an improvement in the control performance obtained by the application of model updating. View full abstract»

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  • Robust stability of additively perturbed interconnected systems

    Publication Year: 1984 , Page(s): 1069 - 1075
    Cited by:  Papers (4)
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    The concept of generalized block diagonal dominance is used to derive robust stability results for additively perturbed interconnected systems. These results characterize the robustness of interconnected systems by putting upper bounds on the spectral norms of the various subblocks of admissible perturbations. View full abstract»

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  • Recursive identification algorithms for right matrix fraction description models

    Publication Year: 1984 , Page(s): 1103 - 1106
    Cited by:  Papers (3)
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    Multivariable identification algorithms are usually designed only for left matrix fraction description (LMFD) models. In this paper we consider recursive identification algorithms for right matrix fraction description (RMFD) models with diagonal denominator matrices. The algorithms are of prediction error (PE) and model reference (MR) type. Results from simulations illustrate the performance of the algorithms. View full abstract»

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  • Controllability, observability, and duality in singular systems

    Publication Year: 1984 , Page(s): 1076 - 1082
    Cited by:  Papers (148)
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    The concepts of controllability and observability for systems of the form E\dot{x} = Ax + Bu, y = Cx, E singular are considered. A theory is presented which unifies the three main approaches to this topic already existing in the literature. The development includes a generalization of the duality theorem from state-space theory. View full abstract»

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  • A new set of necessary and sufficient conditions for a system to be prime

    Publication Year: 1984 , Page(s): 1091 - 1095
    Cited by:  Papers (1)
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    In this note, we first generalize the notion of the interactor (Wolovich and Falb [1]), and modify the input-output structure algorithm of Silverman [2], in order to obtain simple relations between the dimension of supremal output nulling invariant subspace V*and the degree of the determinant of the interactor \partial _{T} and the integers obtained from the structure algorithm. Then, we show that these relations can be used to derive a new set of necessary and sufficient conditions for a linear multivariable system to be prime (Morse [3]). View full abstract»

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  • A transformation approach to stochastic model reduction

    Publication Year: 1984 , Page(s): 1097 - 1100
    Cited by:  Papers (57)
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    A new and direct approach to stochastic model reduction is developed. The order reduction algorithm is obtained by establishing an equivalence between canonical correlation analysis and solutions to algebraic Riccati equations. Also the concept of balanced stochastic realization (BSR) plays a fundamental role. Asymptotic stability of the reduced-order realization is established, and spectral domain interpretations for the BSR are given. View full abstract»

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  • On obtaining the coefficients of the output transfer function from a state-space model and an output model of a linear constant coefficient system

    Publication Year: 1984 , Page(s): 1122 - 1125
    Cited by:  Papers (3)
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    A compact procedure for the calculation of the coefficients of the output transfer function of a system is presented. The coefficients of the plant characteristic polynomial are obtained as an explicit byproduct of this approach. Some additional insight into the consequence of the system's state being unobservable by the output is gained. If the state is fully observable via the output, the characteristic polynomial of the system state transfer matrix is determined. View full abstract»

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  • Principal component analysis of flexible systems--Open-loop case

    Publication Year: 1984 , Page(s): 1095 - 1097
    Cited by:  Papers (21)
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    A generic class of flexible systems, characterized by finitely many lightly damped harmonic oscillators, is analyzed by means of the "open-loop principal component analysis," that is, singular value analysis and Gramian balancing. As the main result, it is shown that, as the damping ratio goes to zero, the balanced state coordinates are decoupled and coincide with the modal coordinates. Further, simple formulas expressing the "asymptotic singular values" as functions of the modal parameters are derived. View full abstract»

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  • Proper and stable, minimal MacMillan degrees bases of rational vector spaces

    Publication Year: 1984 , Page(s): 1118 - 1120
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    The structure of proper and stable bases of rational vector spaces is investigated. We prove that if t(s) is a rational vector space, then among the proper bases of 3(s) there is a subfamily of proper bases which are 1) stable, 2) have no zeros in C\bigcup {\infty } and therefore are column (row) reduced at infinity, and 3) their MacMillan degree is minimum among the MacMillan degrees of all other proper bases of 3(s) and it is given by the sum of the MacMillan degrees of their columns taken separately. It is shown that this notion is the counterpart of Forney's concept of a minimal polynomial basis for the family of proper and stable bases of 3(s). View full abstract»

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  • Transient stability of the power system with the effect of the automatic voltage regulator

    Publication Year: 1984 , Page(s): 1120 - 1122
    Cited by:  Papers (1)
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    In this note, the transient stability of the single-machine system with the effect of the automatic voltage regulator is studied, using the direct method of Lyapunov. A new Lyapunov function for stability study of the power system is constructed by the Lagrange-Charpit method. The Lyapunov function is then used to estimate the critical reclosing times for power-system transient stability. The critical reclosing times given by the proposed Lyapunov function are compared to those obtained by numerical integration. View full abstract»

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  • A solution method for the static constrained Stackelberg problem via penalty method

    Publication Year: 1984 , Page(s): 1111 - 1114
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    This note presents a new solution method for the static constrained Stackelberg problem. Through our approach, the Stackelberg problem is completely transformed into a one-level unconstrained problem such that the newly introduced overall augmented objective function is minimized with repect to the leader's and the follower's variables jointly. It can be proved that a sequence of solutions to the transformed problems converges to the solution of the original problem, when the penalty parameters are updated. 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