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IEE Proceedings - Control Theory and Applications

Issue 1 • Date Jan. 2003

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Displaying Results 1 - 14 of 14
  • Feedback of passive systems: synthesis and analysis of linear robust control systems

    Publication Year: 2003, Page(s):83 - 91
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (609 KB)

    The feedback interconnection of passive systems always leads to a stable control loop. This fact can be used for synthesis and analysis of linear robust control systems in a uniform framework. In the case of slowly varying uncertainties the plant can be represented by a linear time-invariant (LTI) multimodel. Rendering this multimodel passive and using a strong strictly passive controller ensures ... View full abstract»

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  • Delay dependent stability of neutral systems with time delay: an LMI approach

    Publication Year: 2003, Page(s):23 - 27
    Cited by:  Papers (28)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (306 KB)

    A delay dependent stability problem is addressed for neutral systems with discrete and distributed delays. A new stability criterion, based on the solution of linear matrix inequalities, is proposed. Two examples are given to illustrate that the proposed method is effective and can provide a less conservative result. View full abstract»

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  • Robust stability of singularly perturbed systems with state delays

    Publication Year: 2003, Page(s):2 - 6
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (307 KB)

    The stability of a linear two-time-scale system with state delays is studied. A delay-dependent sufficient condition for the stability bound ε* is given, such that the stability of the full-order model can be inferred from the analysis of its reduced-order model in separate time scales. The stability robustness problem of the same system is also discussed, where both the system matrices and t... View full abstract»

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  • Control of conditional output probability density functions for general nonlinear and non-Gaussian dynamic stochastic systems

    Publication Year: 2003, Page(s):55 - 60
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (425 KB)

    A method to control the shape of the conditional output probability density function for general nonlinear-dynamic stochastic systems represented by a nonlinear ARMAX model is presented. The system is subjected to an arbitrary and bounded random input. Under the assumption that all the variables are uniformly bounded, a mathematical relationship is formulated among the conditional output probabili... View full abstract»

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  • Q-domain four-blocks l1-optimal control design for SISO plants

    Publication Year: 2003, Page(s):37 - 44
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (575 KB)

    The multiblock l1-optimal control problem for single-input single-output (SISO) plants is considered. It is shown that it can be converted via polynomial equation techniques to an infinite-dimensional linear programming (LP) problem. Finite dimensional sub/super approximations can be determined by considering two sequences of modified finite-dimensional linear programming problems deriv... View full abstract»

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  • Guaranteed-cost control of a linear uncertain system with multiple time-varying delays: an LMI approach

    Publication Year: 2003, Page(s):17 - 22
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (373 KB)

    The guaranteed-cost control program via memoryless state feedback controllers is studied for a class of linear time varying delay systems with norm-bounded time varying parametric uncertainty and a given quadratic cost function. The time varying delays considered are assumed bounded but no information to be available. Sufficient conditions for the existence of guaranteed-cost controllers are given... View full abstract»

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  • Parametric eigenstructure assignment via output feedback based on singular value decompositions

    Publication Year: 2003, Page(s):93 - 100
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (549 KB)

    Eigenstructure assignment in multivariable linear systems via output feedback is investigated. Three problems are proposed that are related to a type of generalised Sylvester matrix equations. By proposing a general complete parametric solution to this type of generalised Sylvester matrix equations based on singular value decompositions, a general complete parametric approach is presented for the ... View full abstract»

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  • Reliable control design using a two-stage linear quadratic reliable control

    Publication Year: 2003, Page(s):77 - 82
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    Two-step linear quadratic optimal control update equations and a sequential gain updating scheme are used to design a reliable guaranteed cost discrete-control system called two-stage linear quadratic reliable control (TSLQRC). Using this method reliable linear quadratic design results for continuous-time systems can be easily extended to discrete-time systems. The stability and performance gain m... View full abstract»

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  • Design of a robust controller using only output feedback to solve the servomechanism problem

    Publication Year: 2003, Page(s):28 - 36
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (531 KB)

    The design of a robust controller using only output feedback to solve the servomechanism problem is considered. A PI control algorithm and a sliding-mode control design are combined to alleviate system uncertainties and to solve the output regulation problem. A reduced-order observer for the transformation matrix is proposed to estimate the system states, and a control law is designed with respect... View full abstract»

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  • Asymptotically optimal stabilising quadratic control of an inverted pendulum

    Publication Year: 2003, Page(s):7 - 16
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (526 KB)

    A method for the design and synthesis of near-optimal, nonlinear control laws is examined, based on a generalisation of linear quadratic optimal control theory and which effectively provides a near-optimal gain schedule. The method is simple to apply and affords greater design flexibility (via state-dependent weighting) than conventional approaches. The resulting regulator can, in principle, be im... View full abstract»

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  • Profile tracking performance of a low ripple hybrid stepping motor servo drive

    Publication Year: 2003, Page(s):69 - 76
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (550 KB)

    A control strategy to harness the torque ripple of a hybrid stepping motor at low speeds for precision profile tracking is proposed. The strategy uses a model-based control design that controls the phase current based on the direct quadrature transformation of the second-order nonlinear dynamics. An identification procedure based on a least-squares algorithm is applied to estimate the model parame... View full abstract»

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  • Constructing sparse realisations of finite-precision digital controllers based on a closed-loop stability related measure

    Publication Year: 2003, Page(s):61 - 68
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (537 KB)

    The authors present a study of the finite word length (FWL) implementation for digital controller structures with sparseness consideration. A closed-loop stability related measure is derived, taking into account the number of trivial elements in a controller realisation. A practical design procedure is presented, which first obtains a controller realisation that maximises a lower bound of the prop... View full abstract»

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  • Modified anti-windup scheme for PID controllers

    Publication Year: 2003, Page(s):49 - 54
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (350 KB)

    An anti-windup scheme for proportional-integral-derivative controllers is presented. The approach is based on the combined use of back-calculation and conditional integration anti-windup techniques. In this way, the disadvantages that can hinder previously proposed strategies are overcome. Specifically, the method can guarantee a satisfactory performance for processes with different normalised dea... View full abstract»

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  • Nonlinear rule-based controller for missile terminal guidance

    Publication Year: 2003, Page(s):45 - 48
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    The design of a rule-based guidance law for homing missiles onto targets is presented. The stability of the missile-target dynamics is proven. Unlike conventional approaches that solve the Hamilton-Jacobi partial differential inequality associated with the missile guidance problem, the proposed guidance law is based on heuristic fuzzy rules. Furthermore, the proposed missile guidance control law g... View full abstract»

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