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IEEE Transactions on Automatic Control

Issue 3 • Date March 1989

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Displaying Results 1 - 25 of 29
  • Asymptotically efficient adaptive allocation schemes for controlled i.i.d. processes: finite parameter space

    Publication Year: 1989, Page(s):258 - 267
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (645 KB)

    The authors consider a controlled i.i.d. (independently identically distributed) process whose distribution is parametrized by an unknown parameter theta belonging to some known parameter space Theta , and a one-step reward associated with each pair of control and the following state of the process. The objective is to maximize the expected value of the sum of one-step rewards over an infinite hor... View full abstract»

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  • On the design of linear multivariable feedback systems via constrained nondifferentiable optimization in H/sup infinity / spaces

    Publication Year: 1989, Page(s):268 - 276
    Cited by:  Papers (75)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (791 KB)

    The design discussed is of linear, lumped, time-invariant, multivariable feedback systems, subject to various frequency and time-domain performance specifications. The approach is based on the use of stabilizing controller parametrizations which result in the formulation of feedback system design problems as convex, nondifferentiable optimization problems. These problems are solvable by recently d... View full abstract»

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  • Almost disturbance decoupling with internal stability

    Publication Year: 1989, Page(s):277 - 286
    Cited by:  Papers (61)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (988 KB)

    The almost disturbance decoupling problem with internal stability is solved in terms of the geometric concepts of linear systems theory. The solution gives necessary and sufficient conditions for the existence of a dynamic output feedback controller such that in the closed-loop system the disturbances are quenched, say in the H/sup infinity /-sense, up to any degree of accuracy while maintaining a... View full abstract»

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  • A generalization of Kharitonov's theorem; Robust stability of interval plants

    Publication Year: 1989, Page(s):306 - 311
    Cited by:  Papers (83)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (477 KB)

    The robust stability problem is considered for interval plants, in the case of single input (multioutput) or single output (multi-input) systems. A necessary and sufficient condition for the robust stabilization of such plants is developed, using a generalization of V. L. Kharitonov's theorem (1978). The generalization given provides necessary and sufficient conditions for the stability of a famil... View full abstract»

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  • Identification of a class of nonlinear state-space models using RPE techniques

    Publication Year: 1989, Page(s):312 - 316
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The RPE (recursive prediction error) method in state-space form is developed in the nonlinear systems and extended to include the exact form of a nonlinearity, thus enabling structure preservation for certain classes of nonlinear systems. Both the discrete and the continuous-discrete versions of the algorithm in an innovations model are investigated, and a nonlinear simulation example shows a quit... View full abstract»

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  • Failure detection and identification

    Publication Year: 1989, Page(s):316 - 321
    Cited by:  Papers (300)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (591 KB)

    Using the geometric concept of an unobservability subspace, a solution is given to the problem of detecting and identifying control system component failures in linear, time-invariant systems. Conditions are developed for the existence of a causal, linear, time-invariant processor that can detect and uniquely identify a component failure, first for the case where components can fail simultaneously... View full abstract»

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  • Almost-sure convergence of adaptive algorithms by projections

    Publication Year: 1989, Page(s):325 - 327
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (230 KB)

    A convergence proof is discussed for the normalized least-mean-square (LMS) algorithm for ergodic inputs. The approach is based on interpreting the algorithm as a sequence of relaxed projection operators by which the key contraction property is derived. The proof technique is strongly motivated by physical intuition, and provides additional insight into LMS-type algorithms under ergodic inputs. Em... View full abstract»

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  • Recursive identification of overparametrized systems

    Publication Year: 1989, Page(s):327 - 331
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A recursive identification algorithm based on extended least squares is proposed to deal with the contingency of overparametrization. The algorithm is relatively simple compared to those involving online order determination, being based on adaptively introducing suitable excitation into the algorithm to avoid ill-conditioning. In the case of extended-least-squares-based adaptive estimation, then t... View full abstract»

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  • Application of spectral factorization to the linear discrete-time fixed-point smoothing problem

    Publication Year: 1989, Page(s):333 - 335
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (278 KB)

    An explicit expression for the minimum-variance steady-state fixed-point smoothing estimate of the output of linear, discrete-time invariant system is obtained in terms of the measurement spectral factor. The filtered estimate of the states of the system is first derived by finding the spectral factor for the power density matrix of the measurement signal. The z-transform of the time-varying gain ... View full abstract»

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  • Stochastic task selection and renewable resource allocation

    Publication Year: 1989, Page(s):335 - 339
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A class of renewable-resource-allocation problems is studied for the processing of dynamically arriving tasks with deterministic deadlines. The model presented explicitly considers time available, time required, resources available, resources required, stochastic arrivals of multiple types of tasks, importance of tasks, timeliness of processing, and accuracy of resource allocation. After state aug... View full abstract»

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  • On global stability of adaptive systems using an estimator with parameter freezing

    Publication Year: 1989, Page(s):343 - 346
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (287 KB)

    The results of R. Kosut and B. Friedlander (1985) on robust global stability of direct adaptive controllers using an integral adaptation law are extended to the case where the adaptation algorithm includes a parameter freezing mechanism, i.e. the control parameters are held constant at certain time intervals. The authors' main concern is to propose an estimator with freezing capabilities which pre... View full abstract»

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  • A globally convergent pole placement indirect adaptive controller

    Publication Year: 1989, Page(s):353 - 356
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (355 KB)

    A pole displacement indirect adaptive control algorithm is discussed for discrete-time linear deterministic plants with arbitrary zeros. The global convergence of the resulting closed-loop control system is achieved subject to the assumptions that the plant order and a nonzero lower bound on its degree of controllability are known. The problem of controllability of the plant model estimate is hand... View full abstract»

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  • Robust pole placement direct adaptive control

    Publication Year: 1989, Page(s):356 - 359
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (366 KB)

    A pole-placement direct adaptive control for not necessarily minimum-phase plants is presented, which is robust with respect to unmodeled dynamics and bounded disturbances. The robustness is achieved by using both a normalized least-squares algorithm with dead zone and appropriate nonlinear feedback. The resulting closed-loop system is shown to be globally stable subject to standard assumptions.<<... View full abstract»

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  • A novel approach to the explicit pole assignment self-tuning controller design

    Publication Year: 1989, Page(s):359 - 363
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    A recursive algorithm for the controller design phase of the adaptive pole assignment controller is presented. Compared to other pole-assignment adaptive controllers, the computation time to get the controller parameters is drastically reduced and the numerical stability of the controller parameters is increased. If persistent excitation is imposed, the system poles will be located at the desired ... View full abstract»

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  • Central tendency adaptive pole assignment

    Publication Year: 1989, Page(s):363 - 367
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (383 KB)

    The concept of central-tendency adaptive control for achieving minimum variance objectives, proposed by the authors in a companion paper (1989), is applied to adaptive pole assignment. At any iteration, given plant parameter estimate and their uncertainty, a controller is designed which is most likely to achieve the pole assignment objectives. Simulations show a factor-of-100 improvement in transi... View full abstract»

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  • Central tendency minimum variance adaptive control

    Publication Year: 1989, Page(s):367 - 371
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB)

    The authors propose designing indirect adaptive controllers using measures of central tendency of the a posteriori probability function of the control for parameters. That is, given a knowledge of plant uncertainty at each time instant from estimation algorithms, and a controller design rule, controller parameters are sought which maximize the likelihood of achieving the control objectives. The pa... View full abstract»

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  • ARX modeling of controlled ARMAX plants and LQ adaptive controllers

    Publication Year: 1989, Page(s):371 - 375
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB)

    Conditions under which controlled ARMAX (autoregressive moving-average models with auxiliary inputs) plants can be described by ARX (autoregressive models with auxiliary inputs) models are studied. Among all possible ARX models, the ones that can be correctly used in long-range LQ (linear quadratic) adaptive control are characterized. Within this framework, LQ adaptive controllers embodying standa... View full abstract»

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  • Combined sequence of Markov parameters and moments in linear systems

    Publication Year: 1989, Page(s):379 - 382
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (361 KB)

    The combined sequence of Markov parameters and moments in linear systems is discussed. This sequence is shown to be generated by a linear feedback shift register. Application to the minimal degree partial realization from a mixture of any number of Markov parameters and moments is considered. Central in this particular realization problem is the extension of a Toeplitz partial behavior matrix. Thi... View full abstract»

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  • Comments on "Parameter information content of measurable signals in direct adaptive control" [with reply]

    Publication Year: 1989, Page(s):382 - 383
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (187 KB)

    The commenter shows that the parameter adjustment procedure proposed by J.M. Krause and P.P. Khargonekar (see ibid., vol.AC-32, p.802-10, Sep. 1987) reduces, after sufficiently exciting signals have been obtained, to a standard least-squares algorithm with a linear time-invariant filter. In reply, Krause and Khargonekar acknowledge that the commenter has demonstrated a valid and different interpre... View full abstract»

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  • Comments on "An algorithm for a solution of a stochastic adaptive linear quadratic optimal control problem

    Publication Year: 1989, Page(s):383 - 384
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    It is shown that there is an inconsistency in the derivation of the adaptive estimation equations by R. Rishel and L. Harris (see ibid., vol.AC-31, p.1165-70, Dec. 1986). An extra condition that is required is noted.<> View full abstract»

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  • Comments on "Estimation using a multirate filter

    Publication Year: 1989
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    The present author offers precedents for use of the Bar-Itzhack filter formulation, as recently recast in a multirate parallel Kalman filter framework discussed by D. Andrisani, II and C.-F. Gau (see ibid., vol.AC-32, p.653-6, Jul. 1987).<> View full abstract»

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  • Robust design of stochastic controllers for nonlinear systems

    Publication Year: 1989, Page(s):349 - 353
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The previous results are generalized on the stabilizing property of a control scheme designed for a class of discrete-time nonlinear stochastic systems. First, the existing controller is made more robust with a prescribed degree of stability by proper modifications. Next, the inherent robustness is illustrated by a design utilizing erroneous noise characteristics. Reconsideration of the stability ... View full abstract»

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  • On systems with non-Markovian regime changes

    Publication Year: 1989, Page(s):346 - 349
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Jump models have been proposed for a wide variety of applications from fault-tolerant control to power network transient analysis and multitarget tracking. However, most available results are limited to Markovian transitions, which excludes systems with rates dependent on the time elapsed since the last transition; that is, typically, the burn-in and aging phenomena. A non-Markovian model is propo... View full abstract»

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  • An improved adaptive control for robust adaptation

    Publication Year: 1989, Page(s):339 - 343
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    An adaptive control law consisting of an integral and proportional adaptation is suggested. It is shown that the addition of the proportional adaptation term to the control law improves the performance of the adaptive system. Although this is done in the context of a first-order system, it is believed that this may also be the case for higher-order systems. The scalar case is only discussed. Simul... View full abstract»

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  • On the properties of reduced order Kalman filters

    Publication Year: 1989, Page(s):321 - 324
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Several known results are unified by considering properties of reduced-order Kalman filters. For the case in which the number of noise sources equals the number of observations, it is shown that the reduced-order Kalman filter achieves zero steady-state variance of the estimation error if and only if the plant has no transmission zeros in the right-half plane, since these would be among the poles ... View full abstract»

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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