IEEE Transactions on Automatic Control

Issue 2 • Feb. 1988

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Displaying Results 1 - 18 of 18
  • Comments on "On blocking zeros in linear multivariable systems" [with reply]

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (105 KB)

    Reference is made to a recently published correspondence by P.G. Ferreira in which concern was expressed about the name 'blocking zeros' given in a paper by R.V. Patel (see ibid., vol.AC-31, p.239-41, Mar. 1986) to a newly defined class of zeros for multivariable linear systems. The commenter refers to a few remarks about some 'well-known' results by Ferreira, and objects to the lack of precision ... View full abstract»

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  • Comments on "Reduced conservatism in stability robustness bounds by state transformation" [with reply]

    Publication Year: 1988, Page(s):223 - 224
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (134 KB)

    Reference is made to the paper by R.K. Yedavalli and Z. Liang (see ibid., vol.AC-31, p.863-6, 1986) in which it is shown that state transformation can reduce the conservatism in stability robustness bounds. An attempt is made by the commenters to prove that for unstructured perturbations there always exists a better bound than that reported in the above paper, which can be obtained without using s... View full abstract»

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  • Extensions of the small-μ test for robust stability

    Publication Year: 1988, Page(s):172 - 176
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (524 KB)

    The notion of a topologically arcwise connected set is used to develop a general graph-topology-based robustness test. The test provides a switching criterion among different inequality tests and possibly among different nominal models. When it is applied to extend the small-μ test, the result reduces conservatism and allows a more natural application of the test View full abstract»

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  • Exact calculation of the multiloop stability margin

    Publication Year: 1988, Page(s):156 - 171
    Cited by:  Papers (252)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1064 KB)

    A mapping theorem by L.A. Zadeh and C.A. Desoer (1963) serves as the basis for an algorithm that computes the stability margin k m of diagonally perturbed multivariable feedback systems without conservatism. The stability margin determination not only verifies system stability but also quantifies how much further the plan uncertainties can be extended before instability occurs.... View full abstract»

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  • Adaptive control of time-varying linear systems

    Publication Year: 1988, Page(s):150 - 155
    Cited by:  Papers (161)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (424 KB)

    The authors present a global bounded-input-bounded-state stability theory for a class of continuously adapting controllers applied to time-varying linear systems. This gives theoretical support to the application of many of the algorithms used in practice. A key feature of the analysis is that no persistence of excitation requirement is needed View full abstract»

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  • Principles and engineering of process control with Petri nets

    Publication Year: 1988, Page(s):138 - 149
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (916 KB)

    Event-related control is considered in which process and related process control can be described by states and transitions that can be represented concisely by a Petri net (PN). Both process and related process control systems are event-related, causal, and concurrent and define a special type of PN using a few primitives that are assembled to form a net for which structural and dynamic invariant... View full abstract»

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  • A variable-structure controller

    Publication Year: 1988, Page(s):206 - 209
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (240 KB)

    A variable-structure controller (VSC) is presented that gives a control system fast response, low overshoot, and high accuracy. VSC operation is illustrated and put into an analytical form. An application to a position servo is provided to show its effectiveness View full abstract»

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  • Nonlinear multivariable control of nuclear power plants based on the unknown-but-bounded disturbance model

    Publication Year: 1988, Page(s):130 - 137
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (800 KB)

    A nonlinear control system that is based entirely on the time-domain representation of dynamic systems is proposed for the control of a simplified pressurized-water-reactor (PWR) nuclear power plant model. The initial stage consists of designing several linear control systems using plant models linearized at preselected operating points. A set-theoretic algorithm is used that explicitly treats the... View full abstract»

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  • Feedback control of multiinput nonlinear systems by extended linearization

    Publication Year: 1988, Page(s):193 - 197
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (336 KB)

    Control of a nonlinear system is addressed by considering its family of linearizations. Given that a family of linear state-feedback controllers has been designed to meet some (linear) control objective, it is shown how these controllers can be pieced together into an overall, nonlinear, state-feedback controller. The resulting closed-loop system has the property that its linearizations are equal ... View full abstract»

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  • Some computational results on size reduction in H design

    Publication Year: 1988, Page(s):177 - 185
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (532 KB)

    The authors explore the properties of the algebraic Riccati equation. New results on the rank of the solution to the algebraic Riccati equation are obtained and lead to an efficient algorithm for reducing the size of the antistable transfer function matrix in the model-matching problem. In the 1-block problem, the method is taken further to obtain explicit formulas for a minimal realization of the... View full abstract»

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  • Optimal parametrization of curves for robot trajectory design

    Publication Year: 1988, Page(s):209 - 214
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    A numerical method is presented for the offline determination of the minimum-time parameterization of a fixed path in robot joint space, assuming start and end at rest conditions and subject to constraints on manipulator joint torques. A numerical method for solving the problem is discussed in which the derivative of the change of variables is approximated by a cubic spline. Numerical results for ... View full abstract»

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  • Connective stability for large scale systems described by functional differential equations

    Publication Year: 1988, Page(s):198 - 200
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (204 KB)

    The decomposition-aggregation method, the comparison principle, and vector Lyapunov functionals are used to investigate the stability of large-scale systems described by functional differential equations under structural perturbations. Some sufficient conditions are given so that the zero solution is connectively and uniformly asymptotically stable. An example to illustrate the main results is giv... View full abstract»

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  • State-space realization of multiple-frequency-scale transfer matrices

    Publication Year: 1988, Page(s):185 - 187
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (276 KB)

    The class of linear, time-variant, singularly perturbed systems is considered in which all poles are O(1) or O(1/ε) as ε→O, with coefficient matrices that are analytic functions of ε. It has been shown previously that transfer matrices of systems in the above class are two-frequency-scale. This means that such transfer matrices behave as dynamical systems in two separate freque... View full abstract»

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  • On the suboptimality of a parallel Kalman filter

    Publication Year: 1988, Page(s):214 - 217
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (284 KB)

    A filtering scheme has been proposed in the literature that attempts to achieve a certain amount of parallelism in a discrete-time Kalman filter by forcing the measurement- and time-update levels of the filter to decouple whereby the two levels may be run in parallel. The authors use an error covariance analysis to prove that the proposed filter is suboptimal and is not, in fact, a Kalman filter View full abstract»

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  • A new controller design for manipulators using the theory of variable structure systems

    Publication Year: 1988, Page(s):200 - 206
    Cited by:  Papers (157)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    A controller design for manipulators using the theory of variable-structure systems (VSS) is presented to deal with the set-point regulation problem. The major obstacle of VSS vector control with strong dynamic coupling is overcome for a class of systems with positive symmetric inertia matrices. Parameter variations can easily be considered in the design methodology, which is readily extendable to... View full abstract»

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  • Observers for discrete singular systems

    Publication Year: 1988, Page(s):187 - 191
    Cited by:  Papers (84)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (400 KB)

    The author considers the design of observers for the discrete singular system Ex(k+1)=Ax(k)+Bu (k), y(k)=Cx(k), placing special emphasis on the problems of state reconstruction and minimal-time state reconstruction. It is shown that for a singular system, finite poles can be moved to infinity by state feedbac... View full abstract»

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  • Bayesian parameter estimation

    Publication Year: 1988, Page(s):217 - 222
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (480 KB)

    Taking the Bayesian approach in solving the discrete-time parameter estimation problem has two major results: the unknown parameters are legitimately included as additional system states, and the computational objective becomes calculation of the entire posterior density instead of just its first few moments. This viewpoint facilitates intuitive analysis, allowing increased qualitative understandi... View full abstract»

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  • Almost analytic representation for the solution of the differential matrix Riccati equation

    Publication Year: 1988, Page(s):191 - 193
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (236 KB)

    An almost analytic representation is presented for the solution of the nonhomogeneous and homogeneous, time-invariant and time-variant differential matrix Riccati equation. This representation gives a new insight into the behavior of the optimal estimator on a finite time interval. For the time-invariant case this solution is a basis for an `exact/true' iterative algorithm. For the time-invariant ... 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