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IEEE Transactions on Automatic Control

Issue 10 • Date Oct 1994

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Displaying Results 1 - 25 of 28
  • Centralized and decentralized solutions of the linear-exponential-Gaussian problem

    Publication Year: 1994, Page(s):1986 - 2003
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1348 KB)

    A particular class of stochastic control problems constrained to different information patterns is considered. This class consists of minimizing the expectation of an exponential cost criterion with quadratic argument subject to a discrete-time Gauss-Markov dynamic system, i.e., the linear-exponential-Gaussian (LEG) control problem. Besides the one-step delayed information pattern previously consi... View full abstract»

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  • Fast identification of state-space models via exploitation of displacement structure

    Publication Year: 1994, Page(s):2004 - 2017
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    The computational burden of state-space model identification has prevented its real-time application, although it offers some important advantages over other methods based on input/output transfer functions. A recently proposed state-space identification method uses ideas from sensor array signal processing to somewhat reduce the computational burden. The major costs still remain because of the ne... View full abstract»

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  • Decentralized adaptive regulation

    Publication Year: 1994, Page(s):2163 - 2166
    Cited by:  Papers (78)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A new adaptive control scheme developed by Krstic et al. (1992) is employed to design decentralized adaptive regulators. The interconnected system to be regulated consists of N coupled subsystems having arbitrarily relative degrees. Global stability is established for the closed-loop system and perfect regulation is ensured View full abstract»

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  • Direct adaptive control of parabolic systems: algorithm synthesis and convergence and stability analysis

    Publication Year: 1994, Page(s):2018 - 2033
    Cited by:  Papers (88)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    This paper presents a model reference adaptive control of a class of distributed parameter systems described by linear, n-dimensional, parabolic partial differential equations. Unknown parameters appearing in the system equation are either constant or spatially-varying. Distributed sensing and actuation are assumed to be available. Adaptation laws are obtained by the Lyapunov redesign method. It I... View full abstract»

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  • Stable LQG controllers

    Publication Year: 1994, Page(s):2104 - 2106
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The optimal LQG controller is known to stabilize the closed loop if certain mild conditions are satisfied. The controller itself, however, may be unstable. The paper presents a method of selecting the weighting and covariance matrices such that the optimal controller is internally asymptotically stable. The method is very easy to apply and for stable open-loop system involves the solution of a sin... View full abstract»

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  • Observers for nonlinear systems in steady state

    Publication Year: 1994, Page(s):2113 - 2118
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    After constructing a nonlinear observer and applying state feedback depending on the estimated states to asymptotically stabilize the system, we introduce new inputs of bounded norm to the system. We then show that the parameters for the observer, with sufficiently good initial error estimates, can be chosen so that the error between states and estimates goes to zero. Particular remarks are approp... View full abstract»

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  • “First come, first served” can be unstable!

    Publication Year: 1994, Page(s):2166 - 2171
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Considers flexible manufacturing systems using the “first come, first served” (FCFS or FIFO) scheduling policy at each machine. The authors describe and discuss in some detail simple deterministic examples which have adequate capacity but which, under FCFS, can exhibit instability; unboundedly growing WIP taking the form of a repeated pattern of behavior with the repetitions on an incr... View full abstract»

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  • Solution to the positive real control problem for linear time-invariant systems

    Publication Year: 1994, Page(s):2034 - 2046
    Cited by:  Papers (152)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    In this paper we study the problem of synthesizing an internally stabilizing linear time-invariant controller for a linear time-invariant plant such that a given closed-loop transfer function is extended strictly positive real. Necessary and sufficient conditions for the existence of a controller are obtained. State-space formulas for the controller design are given in terms of solutions to algebr... View full abstract»

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  • Analysis and applications of robust nonsingularity problem using the structured singular value

    Publication Year: 1994, Page(s):2118 - 2122
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    This note uses the structured singular value technique to solve the robust nonsingularity analysis problem for matrices with unstructured and/or quadratically coupled structured uncertainties. With the ready μ-analysis tools, a new approach is proposed for finding a set of uncertainties within which the perturbed matrix keeps nonsingularity. Applications and examples in robust control theory ar... View full abstract»

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  • Structure invariance for uncertain nonlinear systems

    Publication Year: 1994, Page(s):2154 - 2158
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A unified study of three control problems associated to multi-input multi-output nonlinear systems with uncertainties is presented, namely, input-state linearization by static state feedback, input-output decoupling by static state feedback and input-output decoupling by dynamic compensation. For each of these problems, geometric conditions which describe intrinsic structural invariance properties... View full abstract»

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  • Design of variable structure voltage regulator using pole assignment technique

    Publication Year: 1994, Page(s):2106 - 2110
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    In a power system, the role of a generator voltage regulator is to ensure that the output voltage is maintained within an acceptable threshold. In this paper a voltage regulator is proposed. The design of this regulator is based on both variable structure control theory and a pole assignment technique. The performance of the proposed regulator has been compared to that of the realistic regulator s... View full abstract»

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  • Optimal state estimation without the requirement of a priori statistics information of the initial state

    Publication Year: 1994, Page(s):2087 - 2091
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The result given by the Kalman filter is the best linear unbiased estimate (BLUE) provided that the mean and variance of the initial state are known. The same state estimation problem is reconsidered for multi-input multi-output (MIMO) stochastic time-varying discrete systems when the statistics knowledge about the initial state is not known. The algorithm presented in this paper gives the BLUE of... View full abstract»

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  • Worst-case analysis of identification-BIBO robustness for closed-loop data

    Publication Year: 1994, Page(s):2171 - 2176
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    This paper deals with the worst-case analysis of identification of linear shift-invariant (possibly) infinite-dimensional systems. A necessary and sufficient input richness condition for the existence of robustly convergent identification algorithms in l1 is given. A closed-loop identification setting is studied to cover both stable and unstable (but BIBO stabilizable) systems. Identifi... View full abstract»

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  • Stochastic adaptive prediction and model reference control

    Publication Year: 1994, Page(s):2047 - 2060
    Cited by:  Papers (37)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB)

    Guo and Chen (1991) have recently shown how to establish the self-optimality and mean square stability of a self-tuning regulator. The idea allows us to proceed with the development of a more comprehensive theory of stochastic adaptive filtering, control and identification. In adaptive filtering, we examine both indirect and noninterlaced direct schemes for prediction, using both least-squares and... View full abstract»

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  • A parameterization of minimal stochastic realizations

    Publication Year: 1994, Page(s):2122 - 2126
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Given a rational spectral density and a minimal spectral factor, a parameterization of all minimal spectral factors is derived. A minimal realization of each minimal spectral factor is also provided. This parameterization is shown to hold under the condition of nonintersection between the spectra of two matrices. This condition, first introduced in previous work by Ferrante et al. (1993), is prove... View full abstract»

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  • Robust control of robots via linear estimated state feedback

    Publication Year: 1994, Page(s):2159 - 2162
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    In this note we propose a robust tracking controller for robots that requires only position measurements. The controller consists of two parts: a linear observer part that generates an estimated error state from the error on the joint position and a linear feedback part that utilizes this estimated state. It is shown that this computationally efficient controller yields semi-global uniform ultimat... View full abstract»

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  • Convergence of controllers designed using state-space techniques

    Publication Year: 1994, Page(s):2100 - 2104
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    In this paper coprime factorization theory is used to examine convergence of finite-dimensional controllers for infinite-dimensional systems designed using approximations. Under assumptions of uniform stabilizability/detectability, the controllers stabilize the original system for large enough model order and the corresponding sequence of closed-loops converge View full abstract»

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  • The input-to-state stability condition and global stabilization of discrete-time systems

    Publication Year: 1994, Page(s):2111 - 2113
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    In this paper the discrete-time analog of the input-to-state stability condition introduced by Sontag [1989-1991]for the continuous-time case is presented together with two theorems dealing with global stabilization of discrete-time systems. The corresponding proofs are discrete analogs of those presented for the continuous-time case. It is shown that the assumptions of the main results for the di... View full abstract»

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  • The resolution of equation XA+XBX=HX and the pole assignment problem

    Publication Year: 1994, Page(s):2091 - 2095
    Cited by:  Papers (42)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    This paper deals with the resolution of equation XA+XBX=HX, which plays a fundamental rule in the design of controllers of linear systems with constrained control by the use of the recently developed concept of positive invariance. It is also shown that this equation represents a partially pole assignment problem. Such resolution allows us to build a new method, called the inverse procedure, to de... View full abstract»

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  • Semi-cancellable fractions in system theory

    Publication Year: 1994, Page(s):2148 - 2153
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    In this paper, we propose to define the transfer function of a system in a new way, namely as a semi-cancellable fraction (SCF), i.e. a fraction in which unstable pole-zero cancellations are not allowed. Within this new framework, it is possible to be rigorous and coherent in dealing with the stabilizability of a system from an input-output viewpoint, not focusing on the stabilizability of infinit... View full abstract»

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  • Nonparametric identification of Wiener systems by orthogonal series

    Publication Year: 1994, Page(s):2077 - 2086
    Cited by:  Papers (79)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    A Wiener system, i.e., a system comprising a linear dynamic and a nonlinear memoryless subsystems connected in a cascade, is identified. Both the input signal and disturbance are random, white, and Gaussian. The unknown nonlinear characteristic is strictly monotonous and differentiable and, therefore, the problem of its recovering from input-output observations of the whole system is nonparametric... View full abstract»

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  • Adaptive observer for continuous descriptor systems

    Publication Year: 1994, Page(s):2095 - 2100
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    We design an adaptive observer for a stable single-input and single-output continuous descriptor (generalized state-space or singular) system. Under the assumption that the descriptor system is observable, it is transformed into what we call descriptor observer canonical form. This form also allows the descriptor variable to be represented by a linear combination of the 2n unknown parameters and t... View full abstract»

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  • A remark on chaotic behavior in adaptive control systems

    Publication Year: 1994, Page(s):2145 - 2148
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    This note deals with the control of a linear discrete-time system designed on the assumptions that we do not have explicit knowledge of the order of the plant. The objective is to cause the output to track a given constant reference y*, when the initial conditions are in a neighborhood of y*. In previous papers the presence of chaos was conjectured for an adaptive scheme where the plant to be cont... View full abstract»

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  • Stochastic dynamic job shops and hierarchical production planning

    Publication Year: 1994, Page(s):2061 - 2076
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    This paper presents an asymptotic analysis of hierarchical production planning in a general manufacturing system consisting of a network of unreliable machines producing a variety of products. The concept of a dynamic job shop is introduced by interpreting the system as a directed graph, and the structure of the system dynamics is characterized for its use in the asymptotic analysis. The optimal c... View full abstract»

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  • On the stabilization of a cable with a tip mass

    Publication Year: 1994, Page(s):2140 - 2145
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    In this note, we consider a vertical cable which is pinched at the upper end. A mass is attached at the lower end where a control force is also applied. We show that this hybrid system is uniformly stabilized by choosing a suitable control law for the control force depending on the velocity and angular velocity at the free end. Moreover for specific values of the feedback coefficients, we obtain t... 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