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IEE Proceedings - Control Theory and Applications

Issue 5 • Date Sep 2001

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Displaying Results 1 - 12 of 12
  • Robust stability of singularly perturbed state feedback systems using unified approach

    Publication Year: 2001, Page(s):391 - 396
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (547 KB)

    A method for the decomposition of unified state-feedback singularly perturbed systems is presented. Based on the small-gain theorem, a sufficient condition for robust stability is derived such that the composite state feedback renders the closed-loop singularly perturbed system asymptotically stable. With this method there is no need to consider two different approaches for continuous-time and dis... View full abstract»

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  • New efficient frequency domain algorithm for H approximation with applications to controller reduction

    Publication Year: 2001, Page(s):383 - 390
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (706 KB)

    New frequency domain computational schemes for the weighted and unweighted H norm system approximation problems are introduced. The schemes are applicable in both continuous and discrete-time cases. The new algorithm is used to obtain reduced order controllers for a well known control problem View full abstract»

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  • Genetic algorithm approach to designing finite-precision controller structures

    Publication Year: 2001, Page(s):377 - 382
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (671 KB)

    The parameters of a digital control design usually need to be rounded when the controller is implemented with finite precision arithmetic. This often results in degradation of the closed loop performance and reduced stability margins. This paper presents a multi-objective genetic algorithm based approach to designing the structure of a finite-precision second-order state space controller implement... View full abstract»

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  • Poles and zeros of α-β and α-β-γ tracking filters

    Publication Year: 2001, Page(s):370 - 376
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    Discrete transfer functions for the α-β and α-β-γ Kalman tracking filters are presented. Filters for the update, as well as the prediction, estimates are considered. Root loci for the poles and zeros are presented, parameterised in the manoeuvring index. Closed-form solutions for the α-β-γ gains are given as functions of the manoeuvring index View full abstract»

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  • Identification of processes with direction-dependent dynamics

    Publication Year: 2001, Page(s):362 - 369
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (773 KB)

    The identification of systems which have different dynamics when the output is increasing compared with those when the output is decreasing is considered. The dynamics in each direction will be assumed to be linear. It is shown that when such systems are perturbed by pseudorandom binary signals based on maximum length sequences, there are coherent patterns in the input-output crosscorrelation func... View full abstract»

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  • Box-Jenkins model LQG controller: design and performance

    Publication Year: 2001, Page(s):419 - 429
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (791 KB)

    The relationship between the variances of the input and output variables of a Box-Jenkins model control system under the linear quadratic Gaussian control law is obtained. This relationship is generalised to the relationships between the statistics of the input and output variables under this control law. Formulae to calculate these statistics are derived. The statistics are the auto-covariances a... View full abstract»

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  • Robust optimal guaranteed cost control for 2D discrete systems

    Publication Year: 2001, Page(s):355 - 361
    Cited by:  Papers (22)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (581 KB)

    The guaranteed cost control problem is studied for a class of 2D discrete uncertain systems in the Fornasini-Marchesini state space setting. The uncertainty is assumed to be norm-bounded. Based on the guaranteed cost controller for 1D differential/difference systems, the notion of the guaranteed cost control problem for 2D discrete systems is proposed. The problem is to design both a static-state ... View full abstract»

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  • Zero-placement approach to the design of sliding surfaces for linear multivariable systems

    Publication Year: 2001, Page(s):333 - 339
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (554 KB)

    A method is introduced for sliding-surface design for multivariable linear systems based on the placement of the transfer function transmission zeros from the control signal to the (fictitious) output which specifies the sliding surface. The design procedure uses the Luenberger feedback canonical form with input normalisation, which in turn is calculated using numerically reliable orthogonal trans... View full abstract»

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  • Constructing networks of continuous-time velocity-based models

    Publication Year: 2001, Page(s):397 - 405
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (588 KB)

    A conventional local model (LM) network consists of a set of affine local models blended together using appropriate weighting functions. Such networks have poor interpretability since the dynamics of the blended network are only weakly related to the underlying local models. In contrast, velocity-based LM networks employ strictly linear local models to provide a transparent framework for nonlinear... View full abstract»

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  • LMI-based quadratic stability analysis for hierarchical fuzzy systems

    Publication Year: 2001, Page(s):340 - 349
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (772 KB)

    The quadratic stability issue in a hierarchical fuzzy system is investigated and a Takagi-Sugeno (TLS) type hierarchical fuzzy controller is proposed to regulate the nth order linear SISO plant with the bounded time-varying uncertainties or nonlinearities. The proposed T-S type hierarchical fuzzy controller is made up of n-1 2D T-S type fuzzy controllers and allows for the simple closed dynamics i... View full abstract»

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  • Identification of fuzzy models with the aid of evolutionary data granulation

    Publication Year: 2001, Page(s):406 - 418
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1029 KB)

    The identification of fuzzy rule-based systems is considered. By their nature, these fuzzy models are geared toward capturing relationships between information granules-fuzzy sets. The level of granularity of fuzzy sets helps establish a required level of detail that is of interest in the given modelling environment. The form of the information granules themselves (in particular their distribution... View full abstract»

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  • Robust PI and PID controller design in delta domain

    Publication Year: 2001, Page(s):350 - 354
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (634 KB)

    A simple unified tuning method for PI and PID delta-domain controllers for SISO plants is developed. The method can shape the nominal stability, transient performance, static accuracy and control signal. A problem of how to satisfy the robust closed-loop stability and performance is also addressed. The method leads to a parameterised set of controllers that provide the required stability margin fo... View full abstract»

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