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Automatic Control, IEEE Transactions on

Issue 11 • Date Nov. 2001

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Displaying Results 1 - 25 of 27
  • Scanning the issue

    Publication Year: 2001 , Page(s): 1681
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    Freely Available from IEEE
  • Comments on "Parameterization of stabilizing compensators by using reduced-order observers"

    Publication Year: 2001 , Page(s): 1840 - 1842
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (112 KB) |  | HTML iconHTML  

    A counterexample of the above mentioned paper (Fujimori, IEEE Trans. Automat. Contr., vol. 38, p. 1435-39, 1993) is given. It is shown that the parameterization of all proper compensators internally stabilizing the plant is incomplete. Modified parameterization of all proper stabilizing compensators is also presented. View full abstract»

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  • Comments on "An unstable plant with no poles"

    Publication Year: 2001
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (35 KB) |  | HTML iconHTML  

    In the above paper (MacCluer, IEEE Trans. Automat. Contr., vol. 45, p. 1575-76, 2000), it was shown by way of an example that there exist bounded-input-bounded-output (BIBO) unstable linear systems whose transfer functions are analytic in the finite plane. We note that this result could easily be shown by using some examples already present in the literature. View full abstract»

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  • Comments on "An exponentially stable adaptive friction compensator"

    Publication Year: 2001 , Page(s): 1844 - 1845
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (73 KB) |  | HTML iconHTML  

    This note points out a technique error in the above paper (Liao and Chien, IEEE Trans. Automat. Contr., Vol. 45, p. 977-80, 2000). It is shown that without persistence of excitation (PE) of the system signals, the estimated Coulomb friction parameter cannot be guaranteed to converge to its true value. An analysis is provided for the PE condition of parameter asymptotic convergence. View full abstract»

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  • Stochastic controls: Hamiltonian systems and HJB equations [Book Reviews]

    Publication Year: 2001 , Page(s): 1846
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    Freely Available from IEEE
  • A note on input-to-state stability and averaging of systems with inputs

    Publication Year: 2001 , Page(s): 1760 - 1765
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (243 KB) |  | HTML iconHTML  

    Two different definitions of an average for time-varying systems with inputs and a small parameter that were recently introduced in the literature are considered: "strong" and "weak" averages. It is shown that if the strong average is input-to-state stable (ISS), then the solutions of the actual system satisfy an integral bound in a semiglobal practical sense. The integral bound that we prove can ... View full abstract»

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  • Stochastic stability analysis of fault-tolerant control systems in the presence of noise

    Publication Year: 2001 , Page(s): 1810 - 1815
    Cited by:  Papers (36)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (190 KB) |  | HTML iconHTML  

    The stochastic stability of fault tolerant control systems (FTCSs) in the presence of noise are,analyzed using the Lyapunov function approach. In particular, the FTCS with a Markovian fault detection and isolation process having transition probabilities conditioned on the state of another Markovian process representing component failures, is considered. The almost sure asymptotic stability in prob... View full abstract»

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  • Design of fault diagnosis filters and fault-tolerant control for a class of nonlinear systems

    Publication Year: 2001 , Page(s): 1805 - 1810
    Cited by:  Papers (46)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (244 KB) |  | HTML iconHTML  

    This paper presents a set of algorithms for fault diagnosis and fault tolerant control strategy for affine nonlinear systems subjected to an unknown time-varying fault vector. First, the design of fault diagnosis filter is performed using nonlinear observer techniques, where the system is decoupled through a nonlinear transformation and an observer is used to generate the required residual signal.... View full abstract»

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  • Simple robust output-feedback controller for uncertain nonlinear systems

    Publication Year: 2001 , Page(s): 1765 - 1772
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (273 KB) |  | HTML iconHTML  

    A robust output-feedback controller is designed by using an observer plus backstepping procedure to solve the tracking problems of a class of uncertain nonlinear systems. In the design procedure, three techniques are applied: a) a single filter whose dynamic order is the same as the system order is constructed; b) a normalization signal is introduced; c) positive nonlinear functions that are used ... View full abstract»

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  • Control of mobile platforms using a virtual vehicle approach

    Publication Year: 2001 , Page(s): 1777 - 1782
    Cited by:  Papers (77)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    Two model independent solutions to the problem of controlling wheel-based mobile platforms are proposed. These two algorithms are based on a so called virtual vehicle approach, where the motion of the reference point on the desired trajectory is governed by a differential equation containing error feedback. This, combined with the fact that the proven stable control algorithms are basically propor... View full abstract»

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  • Plant with integrator: an example of reset control overcoming limitations of linear feedback

    Publication Year: 2001 , Page(s): 1797 - 1799
    Cited by:  Papers (58)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (75 KB) |  | HTML iconHTML  

    The purpose of this paper is twofold: 1) to give conditions under which linear feedback control of a plant containing integrator must overshoot; and 2) to give an example of reset control that does not overshoot under such constraints View full abstract»

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  • Robust synthesis in 1: a globally optimal solution

    Publication Year: 2001 , Page(s): 1744 - 1754
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (306 KB) |  | HTML iconHTML  

    In this paper, a method to synthesize controllers that achieve globally optimal robust performance within any prespecified tolerance, against structured norm-bounded time-varying and/or nonlinear uncertainty is developed. The performance measure considered is the infinity to infinity induced norm of a system's transfer function. The method developed utilizes linear relaxation techniques to solve t... View full abstract»

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  • Adaptive regulator for discrete-time nonlinear nonparametric systems

    Publication Year: 2001 , Page(s): 1836 - 1840
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    A direct adaptive regulator for nonlinear nonparametric systems with measurement corrupted by noise is proposed. Under reasonable conditions the state of the closed-loop system is adaptively regulated so that it converges to zero as time tends to infinity. An illustrative example, being an affine nonlinear system, with all imposed conditions satisfied is given. The method of proof is based on stoc... View full abstract»

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  • Adaptive stabilization of a class of nonlinear systems with nonparametric uncertainty

    Publication Year: 2001 , Page(s): 1821 - 1825
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (189 KB) |  | HTML iconHTML  

    We consider adaptive stabilization for a class of nonlinear second-order systems. Interpreting the system states as position and velocity, the system is assumed to have unknown, nonparametric position-dependent damping and stiffness coefficients. Lyapunov methods are used to prove global convergence of the adaptive controller. Furthermore, the controller is shown to be able to reject constant dist... View full abstract»

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  • Stability-constrained model predictive control

    Publication Year: 2001 , Page(s): 1816 - 1820
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (143 KB) |  | HTML iconHTML  

    This paper presents a new approach to guaranteeing stability of model predictive control (MPC). A stability constraint is computed and propagated forward at each stage as a constraint on the magnitude of the predicted state vector for a state-space controllable-form realization. It is shown that asymptotic stability is guaranteed for the case of constrained multi-input linear time-invariant system... View full abstract»

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  • On quadratic stability of systems with structured uncertainty

    Publication Year: 2001 , Page(s): 1799 - 1805
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (237 KB) |  | HTML iconHTML  

    This paper considers the problem of stability robustness with respect to a class of nonlinear time-varying perturbations which are bounded in a component-wise rather than aggregated manner. A family of robustness bounds is parameterized in terms of a non-singular symmetric matrix. It is shown that the problem of computing the largest robustness bound over the set of non-singular symmetric matrices... View full abstract»

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  • Model matching for finite-state machines

    Publication Year: 2001 , Page(s): 1726 - 1743
    Cited by:  Papers (19)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (445 KB) |  | HTML iconHTML  

    The problem of model matching for finite state machines (FSMs) consists of finding a controller for a given open-loop system so that the resulting closed-loop system matches a desired input-output behavior. In this paper, a set of model matching problems is addressed: strong model matching (where the reference model and the plant are deterministic FSMs and the initial conditions are fixed), strong... View full abstract»

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  • A polynomial approach to nonlinear system controllability

    Publication Year: 2001 , Page(s): 1782 - 1788
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (225 KB) |  | HTML iconHTML  

    Uses a polynomial approach to present a necessary and sufficient condition for local controllability of single-input-single-output (SISO) nonlinear systems. The condition is presented in terms of common factors of a noncommutative polynomial expression. This result exposes controllability properties of a nonlinear system in the input-output framework, and gives a computable procedure for examining... View full abstract»

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  • Stochastic algorithms for exact and approximate feasibility of robust LMIs

    Publication Year: 2001 , Page(s): 1755 - 1759
    Cited by:  Papers (63)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (173 KB) |  | HTML iconHTML  

    In this note, we discuss fast randomized algorithms for determining an admissible solution for robust linear matrix inequalities (LMIs) of the form F(x,Δ)⩽0, where x is the optimization variable and Δ is the uncertainty, which belongs to a given set Δ. The proposed algorithms are based on uncertainty randomization: the first algorithm finds a robust solution in a finite numbe... View full abstract»

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  • Stability of adaptively stabilized stochastic systems

    Publication Year: 2001 , Page(s): 1832 - 1836
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (173 KB) |  | HTML iconHTML  

    Stochastic adaptive stabilization usually leads to the boundedness of the average of squared output of the stabilized system, but gives no conclusion on stability of the resulting system. This paper proves that adaptively stabilized stochastic system in its steady state is truly stable in the conventional sense View full abstract»

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  • Output feedback sampled-data control of nonlinear systems using high-gain observers

    Publication Year: 2001 , Page(s): 1712 - 1725
    Cited by:  Papers (46)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (355 KB) |  | HTML iconHTML  

    This paper studies sampled-data control of nonlinear systems using high-gain observers. The observer is designed in continuous time, then discretized using three different discretization methods. Closed-loop analysis shows that the sampled-data controller recovers the performance of the continuous time controller as the sampling frequency and observer gain become sufficiently large. The theory is ... View full abstract»

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  • Optimal minimal-order least-squares estimators via the general two-stage Kalman filter

    Publication Year: 2001 , Page(s): 1772 - 1776
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (140 KB) |  | HTML iconHTML  

    A direct derivation of the optimal minimal-order least squares estimator is presented using the general two-stage Kalman filter. Using this new result, the reduced-order estimators of O'Reilly (1982) and Fairman and Luk (1985) are readily shown to be equivalent. A practical implementation issue to consider these two estimators is also addressed View full abstract»

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  • Global stabilization for nonlinear uncertain systems with unmodeled actuator dynamics

    Publication Year: 2001 , Page(s): 1826 - 1832
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (232 KB) |  | HTML iconHTML  

    Second-order sliding-mode control (2-SMC) algorithms are analyzed to assess their global convergence properties. While standard first-order sliding-mode control (1-SMC) algorithms derive their effectiveness from the global solution of the well known "reaching condition" ss˙⩽-k2|s| (s=0 being the actual sliding manifold), 2-SMC is based on more complex differential inequalities, ... View full abstract»

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  • Stability enhancement by boundary control in 2-D channel flow

    Publication Year: 2001 , Page(s): 1696 - 1711
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (569 KB) |  | HTML iconHTML  

    In this paper, we stabilize the parabolic equilibrium profile in a two-dimensional (2-D) channel flow using actuators and sensors only at the wall. The control of channel flow was previously considered by Speyer and coworkers, and Bewley and coworkers, who derived feedback laws based on linear optimal control, and implemented by wall-normal actuation. With an objective to achieve global Lyapunov s... View full abstract»

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  • Learning with prior information

    Publication Year: 2001 , Page(s): 1682 - 1695
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (341 KB) |  | HTML iconHTML  

    A notion of learnability is introduced, referred to as learnability with prior information (w.p.i.). This notion is weaker than the standard notion of probably approximately correct (PAC) learnability. A property called "dispersability" is introduced, and it is shown that dispersability plays a key role in the study of learnability w.p.i. Specifically, dispersability of a function class is always ... 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