IEEE Transactions on Automatic Control

Issue 6 • June 1999

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Displaying Results 1 - 25 of 35
  • Comments on "A weighted mixed-sensitivity H/sub /spl infin//-control design for irrational transfer matrices"

    Publication Year: 1999, Page(s):1309 - 1310
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (64 KB)

    This paper shows briefly that, in the above paper by Curtain et al. (see ibid. vol.41 (1996)), there is a slight mistake in the proof of lemma 11.3 and in formula (17) of lemma 111.3. Corrections for formula (17) and a lemma related to it are given. View full abstract»

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  • Linear systems [Book Review]

    Publication Year: 1999, Page(s):1320 - 1321
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    Freely Available from IEEE
  • On zeros of pulse transfer functions

    Publication Year: 1999, Page(s):1229 - 1234
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (208 KB)

    The famous Åstrom-Hagander-Sternby theorem (1984) on limiting zeros of the pulse transfer function is extended by determining the accuracy of the asymptotic results for both the discretization and the intrinsic zeros when the sampling interval is small. Closed form formulas are derived that express the degree of the principal term of Taylor expansion of the difference between the true zeros ... View full abstract»

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  • H tracking control for a class of nonlinear systems

    Publication Year: 1999, Page(s):1202 - 1206
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (200 KB)

    Develops the theory for tracking control using the nonlinear H∞ control design methodology for a class of nonlinear input affine systems. The authors use a two-step process of first designing the feedforward part of the controller to design for perfect trajectory following and then design the feedback part of the controller using nonlinear H∞ regulator theory. Res... View full abstract»

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  • Interpolation of observer state feedback controllers for gain scheduling

    Publication Year: 1999, Page(s):1225 - 1229
    Cited by:  Papers (96)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (176 KB)

    The authors propose a method of interpolating linear time-invariant controllers with observer state feedback structure in order to generate a continuously varying family of controllers that stabilizes a family of linear plants. Gain scheduling is a motivation for this work, and the interpolation method yields guidelines for the design of gain scheduled controllers. The method is illustrated with t... View full abstract»

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  • Subspace identification of bilinear systems subject to white inputs

    Publication Year: 1999, Page(s):1157 - 1165
    Cited by:  Papers (83)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (264 KB)

    The authors generalize linear subspace identification theory to an analog theory for the subspace identification of bilinear systems. A major assumption they make is that the inputs of the system should be white and mutually independent. It is shown that in that case most of the properties of linear subspace identification theory can be extended to similar properties for bilinear systems. The link... View full abstract»

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  • Stability properties and periodic evolutions of bilinear systems in input-output form

    Publication Year: 1999, Page(s):1197 - 1202
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (236 KB)

    Bilinear systems in input-output form are introduced and represented by means of suitable rational functions in two indeterminates. Necessary and sufficient conditions for bounded-input/bounded-output (BIBO) stability are derived and compared with analogous results on two-dimensional systems stability. Several features of the output evolutions corresponding to finite support as well as to periodic... View full abstract»

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  • Minimax quadratic filtering of uncertain linear stochastic systems with partial fourth-order information

    Publication Year: 1999, Page(s):1287 - 1292
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (192 KB)

    A minimax filtering problem for a class of uncertain linear stochastic systems is studied. Uncertainties involving fourth-order moments of the noise distribution and of the initial state are considered. Under the hypothesis that the second-order statistics are known (hence the linear filter is available) the quadratic minimax filter is found. Moreover, it is shown that the minimax filter gives a w... View full abstract»

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  • On supervisory policies that enforce liveness in completely controlled Petri nets with directed cut-places and cut-transitions

    Publication Year: 1999, Page(s):1221 - 1225
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (196 KB)

    The process of synthesizing a supervisory policy that enforces liveness in a Petri net (PN), where each transition can be prevented from firing by an external agent, can be computationally burdensome in general. We consider PNs that have a directed cut place or a cut-transition. A place (transition) in a connected PN is said to be a cut place (cut-transition) if its removal will result in two disc... View full abstract»

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  • Generalized l2 synthesis

    Publication Year: 1999, Page(s):1145 - 1156
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (376 KB)

    Introduces a general framework for control design which can be used to solve several open problems in robust and optimal control. These include systems subject to independently norm-bounded disturbances, robust stability for systems subject to “element by element” bounded structured uncertainty, certain classes of robust performance problems, and systems subject to deterministic white ... View full abstract»

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  • Worst case analysis of nonlinear systems

    Publication Year: 1999, Page(s):1180 - 1196
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (628 KB)

    The authors work out a framework for evaluating the performance of a continuous-time nonlinear system when this is quantified as the maximal value at an output port under bounded disturbances-the disturbance problem. This is useful in computing gain functions and L ∞-induced norms, which are often used to characterize performance and robustness of feedback systems. The approach is... View full abstract»

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  • Integral control of linear systems with actuator nonlinearities: lower bounds for the maximal regulating gain

    Publication Year: 1999, Page(s):1315 - 1319
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (192 KB)

    Closing the loop around an exponentially stable single-input/single-output regular linear system, subject to a globally Lipschitz and nondecreasing actuator nonlinearity and compensated by an integral controller, is known to ensure asymptotic tracking of constant reference signals, provided that: 1) the steady-state gain of the linear part of the plant is positive; 2) the positive integrator gain ... View full abstract»

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  • Impact model and control of two multi-DOF cooperating manipulators

    Publication Year: 1999, Page(s):1297 - 1303
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (216 KB)

    The problem of modeling and controlling the impact between the end-effecters of two multi-DOF cooperating manipulators is considered, with the goal of designing a control scheme that brings the end-effectors in a steady-state contact with each other and regulates the robots to the desired configurations, with an assigned contact force. The equations of motion of the robots are determined both in t... View full abstract»

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  • A simple proof of the Routh test

    Publication Year: 1999, Page(s):1306 - 1309
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (132 KB)

    An elementary proof of the classic Routh method for counting the number of left half-plane and right half-plane zeros of a real coefficient polynomial Pn(s) of degree n is given. Such a proof refers to the polynomials Pi(s) of degree i⩽n formed from the entries of the rows of order i and i-1 of the relevant Routh array. In particular, it is based on the consideration of a... View full abstract»

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  • A parametric approach for l1 robust identification

    Publication Year: 1999, Page(s):1282 - 1286
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (220 KB)

    A convergent algorithm for l1 robust identification of a stable rational transfer function with known order is proposed, which is implemented by solving a linear programming problem and can produce a rational transfer function with a fixed order. An explicit upper bound on its worst case identification error is given. Its performance is proven to be close to that of an interpolation alg... View full abstract»

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  • Synthesis of greatest linear feedback for timed-event graphs in dioid

    Publication Year: 1999, Page(s):1258 - 1262
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (164 KB)

    This paper deals with the synthesis of greatest linear causal feedback for discrete-event systems whose behavior is described in dioid. Such a feedback delays as far as possible the input of the system while keeping the same transfer relation between the input and the output. When a feedback exists in the system, the authors show how to compute a greater one without decreasing the system's perform... View full abstract»

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  • An efficient algorithm for the discrete-time algebraic Riccati equation

    Publication Year: 1999, Page(s):1216 - 1220
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (160 KB)

    The authors develop an algorithm to solve the standard discrete-time algebraic Riccati equation by using a skew-Hamiltonian transformation and the square-root method. The algorithm is structure-preserving and efficient because the Hamiltonian structure is fully exploited and only orthogonal transformations are used. The efficiency and stability of the algorithm are analyzed, numerical examples are... View full abstract»

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  • An interactive parameter space method for robust performance in mixed sensitivity problems

    Publication Year: 1999, Page(s):1272 - 1276
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (180 KB)

    This paper presents an interactive graphical method to determine the set of fixed-order stabilizing controllers achieving robust performance, in the mixed sensitivity framework. The method is limited to single-input/single-output (SISO) systems but offers significant advantages over traditional loop gain shaping methods such as H∞ and μ-synthesis. It can handle pure time delays... View full abstract»

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  • Limitations of disturbance rejection in feedback systems with finite bandwidth

    Publication Year: 1999, Page(s):1132 - 1144
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (292 KB)

    Studies limitations of disturbance rejection in closed-loop control systems. The disturbance is modeled as colored noise, and disturbance rejection is measured by the output variance. Lower bounds on the achievable output variance are derived under several practical constraints, the main one being a bound on the system bandwidth; constraints on the stability robustness (measured by the distance fr... View full abstract»

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  • Local stability and performance robustness of nonlinear systems with structured uncertainty

    Publication Year: 1999, Page(s):1250 - 1254
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (192 KB)

    This paper focuses on robust stability and performance of uncertain nonlinear systems with structured locally bounded uncertainty. It is shown that, in a general setting under a considerably mild structural assumption, a local small gain condition implies robust local performance. The feature of this paper is that the performance is defined in a local sense, which is a realistic property inherentl... View full abstract»

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  • Finite-dimensional risk-sensitive filters and smoothers for discrete-time nonlinear systems

    Publication Year: 1999, Page(s):1234 - 1239
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (220 KB)

    Finite-dimensional optimal risk-sensitive filters and smoothers are obtained for discrete-time nonlinear systems by adjusting the standard exponential of a quadratic risk-sensitive cost index to one involving the plant nonlinearity. It is seen that these filters and smoothers are the same as those for a fictitious linear plant with the exponential of squared estimation error as the corresponding r... View full abstract»

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  • Controllability of a planar body with unilateral thrusters

    Publication Year: 1999, Page(s):1206 - 1211
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (332 KB)

    Investigates the minimal number of unilateral thrusters required for different versions of nonlinear controllability of a planar rigid body. For one to three unilateral thrusters, one gets a new property with each additional thruster: one thruster suffices for small-time accessibility on the body's state space TSE(2); two thrusters suffice for global controllability on TSE(2); and three thrusters ... View full abstract»

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  • Coordinated quality control in a two-stage system

    Publication Year: 1999, Page(s):1166 - 1179
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    The authors study a quality control problem in a two-stage system. They assume that at each stage units are processed in batches, and the rates are random variables with known distributions. Final products are supplied to customers under warranties or service contracts, with penalty costs associated with defective units. The focus is on coordinating the inspection procedures at the two stages. Usi... View full abstract»

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  • Necessary and sufficient conditions for disturbance decoupling with stability using PID control laws

    Publication Year: 1999, Page(s):1311 - 1315
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (256 KB)

    The authors consider the disturbance decoupling problem with stability using PID-control laws. They give necessary and sufficient conditions in order to solve this problem with m derivators (m being a fixed integer). As an obvious by-product, these conditions characterize the minimal value of m for which such a PID-solution exists. They also propose a synthesis procedure View full abstract»

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  • Robust estimation with unknown noise statistics

    Publication Year: 1999, Page(s):1292 - 1296
    Cited by:  Papers (70)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (156 KB)

    The equivalence between the Kalman filter and a particular least squares regression problem is established and the regression problem is solved robustly using a statistical approach, named M-estimation. M-robust estimators are derived for adaptive estimation of the unknown a priori state and observation noise statistics simultaneously with the system states. The feasibility of the approach is demo... 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