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Automatic Control, IEEE Transactions on

Issue 6 • Date June 1985

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1985 , Page(s): 0
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    Freely Available from IEEE
  • Editorial: Technical notes and correspondence: The backbone of the Transactions

    Publication Year: 1985 , Page(s): 513
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1985 , Page(s): 0
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    Freely Available from IEEE
  • Persistency of excitation for nonminimal models of systems having purely deterministic disturbances

    Publication Year: 1985 , Page(s): 589 - 592
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (320 KB)  

    All results to date on the question of persistency of excitation depend on the model being minimal. Thus the results do not apply to systems having purely deterministic disturbances since these automatically give rise to uncontrollable modes on the unil circle. This note presents new results on persistency of excitation applicable to nonminimal models of systems having purely deterministic disturb... View full abstract»

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  • Global convergence of Landaús "Output error with adjustable compensator" adaptive algorithm

    Publication Year: 1985 , Page(s): 593 - 595
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    It is shown that the above identification algorithm is convergent in the sense that the plant-model output error asymptotically tends to zero provided a slight modification is added to the original algorithm as described by Landau [1]. View full abstract»

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  • Minimum-time control of robotic manipulators with geometric path constraints

    Publication Year: 1985 , Page(s): 531 - 541
    Cited by:  Papers (300)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1048 KB)  

    Conventionally, robot control algorithms are divided into two stages, namely, path or trajectory planning and path tracking (or path control). This division has been adopted mainly as a means of alleviating difficulties in dealing with complex, coupled manipulator dynamics. Trajectory planning usually determines the timing of manipulator position and velocity without considering its dynamics. Cons... View full abstract»

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  • Adaptive stabilization of linear systems with unknown high-frequency gains

    Publication Year: 1985 , Page(s): 549 - 554
    Cited by:  Papers (79)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (520 KB)  

    This paper presents an algorithm for adaptively controlling a single-input, single-output process admitting an n -dimensional, minimum-phase linear model of relative degree n*, with unknown parameters. A priori knowledge of the sign of the model's high frequency gain is not required, and a sufficiently rich probing signal is not needed for stabilizat... View full abstract»

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  • Computation of the principal nth roots of complex matrices

    Publication Year: 1985 , Page(s): 606 - 608
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (248 KB)  

    A new computational algorithm for finding the principal n th roots and associated roots of complex matrices is developed via a recursive solution of a block discrete state equation. View full abstract»

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  • Persistency of excitation in the presence of possibly unbounded signals

    Publication Year: 1985 , Page(s): 595 - 597
    Cited by:  Papers (31)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (280 KB)  

    This note develops an explicit characterization of the concept of persistency of excitation for time-invariant linear systems in the presence of possibly unbounded signals. This result can be used to establish exponential convergence for a range of adaptive control algorithms. A feature of our proof is a particular technique for dealing with the initial condition response. View full abstract»

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  • The optimal projection equations for reduced-order state estimation

    Publication Year: 1985 , Page(s): 583 - 585
    Cited by:  Papers (39)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (336 KB)  

    First-order necessary conditions for optimal, steady-state, reduced-order state estimation for a linear, time-invariant plant in the presence of correlated disturbance and nonsingular measurement noise are derived in a new and highly simplified form. In contrast to the lone matrix Riccati equation arising in the full-order (Kalman filter) case, the optimal steady-state reduced-order estimator is c... View full abstract»

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  • Improved measures of stability robustness for linear state space models

    Publication Year: 1985 , Page(s): 577 - 579
    Cited by:  Papers (104)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (288 KB)  

    In this paper, the aspect of "stability robustness" of linear systems is analyzed in the time domain. A bound on the structured perturbation of an asymptotically stable linear system is obtained to maintain stability using a Lyapunov matrix equation solution. The resulting bound is shown to be an improved bound over the ones recently reported in the literature. Also, special cases of the nominal s... View full abstract»

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  • The general state-space model for a two-dimensional linear digital system

    Publication Year: 1985 , Page(s): 600 - 602
    Cited by:  Papers (41)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (296 KB)  

    The general state-space model for a 2-D linear digital system is presented. A new definition of state-transition matrix is given. Based on the definition, it is easy to calculate the state-transition matrix for any linear digital system. The general response formula for a system follows simply from the definition. A new definition of the characteristic function of a system and a theorem parallel t... View full abstract»

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  • Asymptotic recovery for discrete-time systems

    Publication Year: 1985 , Page(s): 602 - 605
    Cited by:  Papers (42)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (408 KB)  

    An asymptotic recovery design procedure is proposed for square, discrete-time, linear, time-invariant multivariable systems, which allows a state-feedback design to be approximately recovered by a dynamic output feedback scheme. Both the case of negligible processing time (compared to the sampling interval) and of significant processing time are discussed. In the former case, it is possible to obt... View full abstract»

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  • Zeros at infinity for affine nonlinear control systems

    Publication Year: 1985 , Page(s): 566 - 573
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (736 KB)  

    A definition of zeros at infinity for affine nonlinear control systems is proposed. The definition is local, which means that we exclude certain singularities. We argue the reasonableness of our definition by showing its relevance to the problem of nonlinear decoupling. In particular, we give a necessary and sufficient condition for the solvability of the general regular decoupling problem for aff... View full abstract»

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  • Optimal digital feedback control systems counting computation time of control laws

    Publication Year: 1985 , Page(s): 542 - 548
    Cited by:  Papers (29)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (560 KB)  

    Since microprocessors are easily obtained, multivariable control theory can be applied to many practical control problems, for example control of robots. However, when the time constant of the plant is short and the dynamic order of the plant is high, the time delay due to the computation time of the control law cannot be neglected. In this paper, the author proposes design methods for linear opti... View full abstract»

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  • Asymptotic properties of black-box identification of transfer functions

    Publication Year: 1985 , Page(s): 514 - 530
    Cited by:  Papers (54)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1192 KB)  

    The problem of estimating the transfer function of a linear, stochastic system is considered. The transfer function is parametrized as a black box and no given order is chosen a priori. This means that the model orders may increase to infinity when the number of observed data tends to infinity. The consistency and convergence properties of the resulting transfer function estimates are investigated... View full abstract»

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  • Right half plane poles and zeros and design tradeoffs in feedback systems

    Publication Year: 1985 , Page(s): 555 - 565
    Cited by:  Papers (188)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1048 KB)  

    This paper expresses limitations imposed by right half plane poles and zeros of the open-loop system directly in terms of the sensitivity and complementary sensitivity functions of the closed-loop system. The limitations are determined by integral relationships which must be satisfied by these functions. The integral relationships are interpreted in the context of feedback design. View full abstract»

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  • Legendre series approach to identification and analysis of linear systems

    Publication Year: 1985 , Page(s): 585 - 589
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (440 KB)  

    In this paper the Legendre operational matrix of integration is introduced, and it is subsequently used for the identification and analysis of linear systems. The algorithms proposed are easily implementable in a digital computer, and they are analogous to those already derived for other types of orthogonal functions. View full abstract»

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  • Robust stability of systems with integral control

    Publication Year: 1985 , Page(s): 574 - 577
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (488 KB)  

    A number of necessary and sufficient conditions are derived, which must be satisfied by the plant d.c. gain matrix of a linear time invariant system in order for an integral controller to exist for which the closed loop system is stable. Based on these results, the robustness of integral control systems is analyzed, i.e., the family of plants is defined which are stable when controlled with the sa... View full abstract»

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  • Transfer function conditions for stability

    Publication Year: 1985 , Page(s): 581 - 583
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (320 KB)  

    A feedback system is defined to be internally stable if all the eigenvalues of the composite state-space representation of the closed-loop system lie in the left plane. Recently, it has been established [1, Theorem 4.3.6, p. 154] that this internal stability is equivalent to external stability of an appropriate system with virtual inputs injected into each subsystem. The proof in [1] uses matrix f... View full abstract»

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  • A note on stabilization by dynamic high gain output feedback

    Publication Year: 1985 , Page(s): 579 - 581
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (360 KB)  

    In this note we study the problem of stabilization by dynamic output feedback. For a certain class of linear systems we establish the existence of pairs of subspaces (\Im , \upsilon _{a}) , where \Im is a minimum phase input subspace contained in an almost stabilizability snbspace \up...
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  • The parsimony principle for a class of model structures

    Publication Year: 1985 , Page(s): 597 - 600
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (408 KB)  

    A new form of the parsimony principle is presented for a class of model structures containing a common subset of parameters. The principle is applied to the problem of estimating the autoregressive (AR) parameters of an AR process corrupted by white measurement noise. 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