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Automatic Control, IEEE Transactions on

Issue 6 • Date June 2007

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Displaying Results 1 - 25 of 38
  • Table of contents

    Publication Year: 2007 , Page(s): C1 - C4
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  • IEEE Transactions on Automatic Control publication information

    Publication Year: 2007 , Page(s): C2
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  • Scanning the issue

    Publication Year: 2007 , Page(s): 973
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  • Nonstationary Consistency of Subspace Methods

    Publication Year: 2007 , Page(s): 974 - 984
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (425 KB) |  | HTML iconHTML  

    In this paper, we study ldquononstationary consistencyrdquo of subspace methods for eigenstructure identification, i.e., the ability of subspace algorithms to converge to the true eigenstructure despite nonstationarities in the excitation and measurement noises. Note that such nonstationarities may result in having time-varying zeros for the underlying system, so the problem is nontrivial. In part... View full abstract»

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  • Accuracy Analysis of the Frisch Scheme for Identifying Errors-in-Variables Systems

    Publication Year: 2007 , Page(s): 985 - 997
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (409 KB) |  | HTML iconHTML  

    Several estimation methods have been proposed for identifying errors-in-variables systems, where both input and output measurements are corrupted by noise. One of the promising approaches is the so-called Frisch scheme. This paper provides an accuracy analysis of the Frisch scheme applied to system identification. The estimates of the system parameters and the noise variances are shown to be asymp... View full abstract»

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  • On Asymptotic Stabilizability of Linear Systems With Delayed Input

    Publication Year: 2007 , Page(s): 998 - 1013
    Cited by:  Papers (32)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (696 KB) |  | HTML iconHTML  

    This paper examines the asymptotic stabilizability of linear systems with delayed input. By explicit construction of stabilizing feedback laws, it is shown that a stabilizable and detectable linear system with an arbitrarily large delay in the input can be asymptotically stabilized by either linear state or output feedback as long as the open-loop system is not exponentially unstable (i.e., all th... View full abstract»

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  • A Control-Theoretic Approach to the Design of Zero Finding Numerical Methods

    Publication Year: 2007 , Page(s): 1014 - 1026
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (750 KB) |  | HTML iconHTML  

    In this paper, it is shown how standard iterative methods for solving linear and nonlinear equations can be designed from the point of view of control. Appropriate choices of control Lyapunov functions (CLFs) lead to both continuous and discrete-time versions of the Newton-Raphson and conjugate gradient algorithms as well as new variants. View full abstract»

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  • Singularities of Optimal Control Problems on Some 6-D Lie Groups

    Publication Year: 2007 , Page(s): 1027 - 1038
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (792 KB) |  | HTML iconHTML  

    This paper considers the motion planning problem for oriented vehicles travelling at unit speed in a 3-D space. A Lie group formulation arises naturally and the vehicles are modeled as kinematic control systems with drift defined on the orthonormal frame bundles of particular Riemannian manifolds, specifically, the 3-D space forms Euclidean space E3, the sphere S3, and the hy... View full abstract»

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  • Dissipativity of T-Periodic Linear Systems

    Publication Year: 2007 , Page(s): 1039 - 1047
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (558 KB) |  | HTML iconHTML  

    It is proved that the existence of a positive-definite storage function is necessary and sufficient for strict dissipativity of linear systems with periodic coefficients. The connection between strict dissipativity of the system and a nonoscillatory property of an associated Hamiltonian system is established. View full abstract»

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  • Combined Design of Disturbance Model and Observer for Offset-Free Model Predictive Control

    Publication Year: 2007 , Page(s): 1048 - 1053
    Cited by:  Papers (15)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (255 KB) |  | HTML iconHTML  

    This note presents a method for the combined design of an integrating disturbance model and of the observer (for the augmented system) to be used in offset-free model predictive controllers. A dynamic observer is designed for the original (nonaugmented) system by solving an Hprop control problem aimed at minimizing the effect of unmeasured disturbances and plant/model mismatch on the ou... View full abstract»

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  • Performance Analysis of Second-Order Sliding-Mode Control Systems With Fast Actuators

    Publication Year: 2007 , Page(s): 1053 - 1059
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (532 KB) |  | HTML iconHTML  

    The robustness of the second-order sliding-mode control (2-SMC) algorithm known as the "generalized sub-optimal" algorithm is analyzed with respect to the cascade introduction of a linear fast actuator. It is shown that if the actuator dynamics are sufficiently fast then the system trajectories converge to an invariant set that includes the second-order sliding domain s = s' = 0. It is also shown ... View full abstract»

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  • Communication Constraints for Decentralized Stabilizability With Time-Invariant Policies

    Publication Year: 2007 , Page(s): 1060 - 1066
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (292 KB) |  | HTML iconHTML  

    In this note, we study communication requirements for decentralized control schemes when sensors and controllers are connected via noiseless digital channels and system noises are bounded. Under various information structures, and within the class of time-invariant encoding and control policies, we quantify achievable rates, and obtain fixed-rate and delayless encoders and decoders that achieve bo... View full abstract»

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  • On the Gap Between Positive Polynomials and SOS of Polynomials

    Publication Year: 2007 , Page(s): 1066 - 1072
    Cited by:  Papers (27)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (289 KB) |  | HTML iconHTML  

    This note investigates the gap existing between positive polynomials and sum of squares (SOS) of polynomials, which affects several analysis and synthesis tools in control systems based on polynomial SOS relaxations, and about which almost nothing is known. In particular, a matrix characterization of the PNS, that is the positive homogeneous forms that are not SOS, is proposed, which allows to sho... View full abstract»

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  • Stability Analysis of a Class of PWM Systems

    Publication Year: 2007 , Page(s): 1072 - 1078
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (577 KB) |  | HTML iconHTML  

    This note considers stability analysis of a class of pulsewidth modulated (PWM) systems that incorporates several different switched mode dc-dc converters. The systems of the class typically have periodic solutions. A sampled data model is developed and used to prove stability of these solutions. Conditions for global and local exponential stability are derived using quadratic and piecewise quadra... View full abstract»

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  • A Sieve Bootstrap Method for Correlation Analysis

    Publication Year: 2007 , Page(s): 1079 - 1081
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (607 KB) |  | HTML iconHTML  

    This note presents a nonparametric sieve bootstrap method for estimating the variance of impulse response coefficients and the process steady-state gain determined via correlation analysis. The bootstrap estimates are demonstrated to be better for small samples than the analytical finite sample variance expression for the simplified form (assuming white noise input) of the Wiener-Hopf equations. M... View full abstract»

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  • Using an Observer to Transform Linear Systems Into Strictly Positive Real Systems

    Publication Year: 2007 , Page(s): 1082 - 1088
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (397 KB) |  | HTML iconHTML  

    In this note, we study the extension of the class of linear time invariant plants that may be transformed into SPR systems introducing an observer. It is shown that for open loop stable systems a cascaded observer achieves the result. For open loop unstable systems an observer-based feedback is required to succeed. In general any stabilizable and observable system may be transformed into an SPR sy... View full abstract»

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  • Finite-Horizon Min–Max Control of Max-Plus-Linear Systems

    Publication Year: 2007 , Page(s): 1088 - 1093
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (872 KB) |  | HTML iconHTML  

    In this note, we provide a solution to a class of finite-horizon min-max control problems for uncertain max-plus-linear systems where the uncertain parameters are assumed to lie in a given convex and compact set, and it is required that the closed-loop input and state sequence satisfy a given set of linear inequality constraints for all admissible uncertainty realizations. We provide sufficient co... View full abstract»

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  • Total Energy Shaping Control of Mechanical Systems: Simplifying the Matching Equations Via Coordinate Changes

    Publication Year: 2007 , Page(s): 1093 - 1099
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (284 KB) |  | HTML iconHTML  

    Total energy shaping is a controller design methodology that achieves (asymptotic) stabilization of mechanical systems endowing the closed-loop system with a Lagrangian or Hamiltonian structure with a desired energy function - that qualifies as Lyapunov function for the desired equilibrium. The success of the method relies on the possibility of solving two PDEs which identify the kinetic and poten... View full abstract»

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  • On the Stability of Switched Positive Linear Systems

    Publication Year: 2007 , Page(s): 1099 - 1103
    Cited by:  Papers (46)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (214 KB) |  | HTML iconHTML  

    It was recently conjectured that the Hurwitz stability of the convex hull of a set of Metzler matrices is a necessary and sufficient condition for the asymptotic stability of the associated switched linear system under arbitrary switching. In this note, we show that (1) this conjecture is true for systems constructed from a pair of second-order Metzler matrices; (2) the conjecture is true for syst... View full abstract»

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  • Equivalence of Laguerre-Based Model Order Reduction and Moment Matching

    Publication Year: 2007 , Page(s): 1104 - 1108
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (198 KB) |  | HTML iconHTML  

    The equivalence between the classical moment matching and the Laguerre-based reduction approaches is shown. In addition, this equivalence is generalized to include a family of coefficients known as generalized Markov parameters. View full abstract»

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  • Some Remarks on the Use of Time-Varying Delay to Model Sample-and-Hold Circuits

    Publication Year: 2007 , Page(s): 1109 - 1112
    Cited by:  Papers (61)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (203 KB) |  | HTML iconHTML  

    This note revises the so-called input delay approach to the control of sampled-data systems with nonuniform sampling, in which the sample-and-hold circuit is embedded into an analog system with a time- varying input delay. It is shown that the conservatism in calculating the maximal admissible sampling period is reduced by about 57% if the time- varying delay embedding step is omitted. View full abstract»

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  • Dynamic Output Feedback H Control Problem for Linear Neutral Systems

    Publication Year: 2007 , Page(s): 1113 - 1118
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (243 KB) |  | HTML iconHTML  

    This note presents the solvability conditions of the dynamic output feedback Hinfin control problem for linear neutral systems with time- varying state delays in the delay-dependent case, where the delay is assumed to be time-varying continuous or differentiable uniformly bounded function, but no restriction on the derivative of the delay is needed, which means that the delay may be the... View full abstract»

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  • Real-Time Optimal Mission Scheduling and Flight Path Selection

    Publication Year: 2007 , Page(s): 1119 - 1123
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (259 KB) |  | HTML iconHTML  

    We consider a mission in which m UAVs with a capacity limit q each visit n(les mq) targets in a hostile environment in a cooperative manner (and return to where they departed from) such that the cost reflecting operating time and risk exposed is minimized. We first propose a mixed-integer linear programming (MILP) formulation which exactly solves the problem and then propose four alternative MILP ... View full abstract»

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  • A Counterexample to a Conjecture of Gurvits on Switched Systems

    Publication Year: 2007 , Page(s): 1123 - 1126
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (171 KB) |  | HTML iconHTML  

    We consider products of matrix exponentials under the assumption that the matrices span a nilpotent Lie algebra. In 1995, Gurvits conjectured that nilpotency implies that these products are, in some sense, simple. More precisely, there exists a uniform bound l such that any product can be represented as a product of no more than I matrix exponentials. This conjecture has important applications in ... View full abstract»

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  • Further Results on the Synthesis of PID Controllers

    Publication Year: 2007 , Page(s): 1127 - 1132
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1924 KB) |  | HTML iconHTML  

    This note focuses on a graphical approach to determine the stability region, in the parameter space, of PID-controlled second-order plants with dead time. This work is the extension of and further results on the same topic of the previous paper in the literature on first-order plants with dead time. The main characterization of the new method is the utilization of a graphical stability criterion i... 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