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IEE Proceedings D - Control Theory and Applications

Issue 6 • Date Nov 1988

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Displaying Results 1 - 25 of 36
  • Analysis of time-varying singular systems via single-term Walsh-series approach

    Publication Year: 1988, Page(s):461 - 462
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    A new method of analysis for linear time-varying singular differential equations of the form K(t)x(t)=A(t)x(t)+B(t)u(t) has been proposed. The method is verified by an illustrative example. View full abstract»

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  • Stable linear system reduction via a multipoint squared-magnitude continued-fraction expansion

    Publication Year: 1988, Page(s):441 - 444
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    In the paper, a method of linear system reduction, using the continued-fraction expansion of the squared-magnitude function about arbitrary frequencies, is presented. It leads to a good approximation while preserving stability and minimum-phase characteristics. View full abstract»

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  • Frequency response method for linear multivariable systems simplification

    Publication Year: 1988, Page(s):381 - 394
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1260 KB)

    A frequency response method is presented for the simplification of linear multivariable systems. The method uses the properties of the characteristic loci and characteristic vectors of a transfer function matrix, with coefficients expressed in rational fractions of s, under analytic perturbation. Among other advantages, the order of the reduced model can be prespecified and certain dynamical retai... View full abstract»

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  • Stochastic time-optimal control problems

    Publication Year: 1988, Page(s):395 - 404
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (617 KB)

    Two types of stochastic time-optimal controls in a one-dimensional setting are considered. Multidimensional problems, in the case of complete state information available and the system modelled by stochastic differential equations, are studied under the formulation of minimising the expected transient-response time. The necessary condition of optimality is the satisfaction for the value function o... View full abstract»

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  • Parametric identification of nonlinear dynamic systems based on nonlinear crosscorrelation functions

    Publication Year: 1988, Page(s):405 - 420
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1153 KB)

    The paper introduces the two-step identification method of least-squares parameter estimation based on correlation functions, for nonlinear dynamic systems with linear parameters. It deals with the identification of the input/output parameter models working in open- and closed-loops. The relation between the structure of a model, the choice of multipliers and the necessary shifting time domain are... View full abstract»

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  • Factored state-space realisation of two-dimensional systems

    Publication Year: 1988, Page(s):421 - 425
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    An algorithm is presented for the factored state-space realisation of two-dimensional (2D) systems. The algorithm is based in the application of the node precedence or ordering concept, used in the synthesis of one-dimensional digital filters, to the 2-D systems. It involves the determination of the continued fraction and its associated signal flow graph from the 2D transfer function. The signal f... View full abstract»

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  • Exact model-matching control of linear discrete-time systems by periodic state or output feedback

    Publication Year: 1988, Page(s):426 - 428
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (203 KB)

    The paper considers an exact model-matching control problem via periodic state-output feedback for discrete systems. A frequency-domain approach is employed in which the prototype system (model) is given by the transfer function G/sub m/(z). The approach is based on equating the closed-loop transfer function G/sub c/(Z) to G/sub m/(z) and solving the resulting equation for the required feedback ag... View full abstract»

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  • Adaptive state tracking

    Publication Year: 1988, Page(s):429 - 435
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (509 KB)

    The problem of adaptive state tracking is considered, where a specified state is required to follow the reference input signal. It is assumed that the system is completely controllable and observable, but the particular state is not directly available for measurement and the measurements are contaminated with stochastic noise. It is also assumed that there is little prior knowledge of the referenc... View full abstract»

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  • Minimax design of optimal stochastic multivariable systems

    Publication Year: 1988, Page(s):436 - 440
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    A new minimax optimal control problem is considered for a stochastic multivariable system. The cost function involves the trace of a weighted sum of spectral density matrices whose frequency response is to be limited. The H/sub infinity / -norm of this scalar function is therefore minimised. To obtain the solution of the minimax control problem, an auxiliary lemma is employed. This enables an equi... View full abstract»

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  • Discrete-time adaptive control for time-varying systems subject to unknown fast time-varying deterministic disturbances

    Publication Year: 1988, Page(s):445 - 450
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (531 KB)

    Presents an adaptive control algorithm for unknown time-varying systems having purely deterministic time-varying disturbances. The algorithm is an extension of the author's earlier work (1986) on adaptive control of deterministic time-varying systems. It is shown that global convergence of the algorithm depends on the observability of a time-varying system. Simulation results are also given to ill... View full abstract»

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  • Generalised predictive control with input constraints

    Publication Year: 1988, Page(s):451 - 460
    Cited by:  Papers (30)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (779 KB)

    Generalised predictive control (GPC), which has been shown to be effective for the self-tuning control of complex plants, is based on the minimisation of a long-range cost function. In previous work this has been achieved by an analytic solution which is not valid if there are constraints on the input control signals. A simple extension is proposed which caters for rate or amplitude limits, and si... View full abstract»

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  • Robust self-tuning regulator for a synchronous generator

    Publication Year: 1988, Page(s):463 - 473
    Cited by:  Papers (13)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (952 KB)

    The paper is concerned with an application of a self-tuning control strategy to a synchronous generator system. In the stochastic control strategy, an auxiliary predictor is introduced and the variance between the actual output of the system and the desired track of the output is directly predicted, to restrain excessive control signals and to improve the control performance of the system. The pap... View full abstract»

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  • Synthesis of control laws with specified gain and phase margin and poles region

    Publication Year: 1988, Page(s):474 - 478
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (351 KB)

    The paper presents a method of synthesising a state-feedback control law which yields a closed-loop system with specified robustness characteristics and meanwhile ensures all closed-loop poles inside a circular region, centered at (e,0) with radius r, where mod e mod +r View full abstract»

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  • Multivariable control of a liquid-liquid extraction column using a probabilistic automaton

    Publication Year: 1988, Page(s):479 - 485
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (644 KB)

    Describes an application of a probabilistic automaton to the control of a liquid-liquid extraction column which presents a highly nonlinear behaviour and time-varying dynamics. The control algorithm is based on a hierarchical structure of automata operating in the random medium corresponding to the process to be controlled. The learning system collects and processes the current data (input/output ... View full abstract»

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  • Analysis of coloured filter controllers for bank-to-turn CLOS guidance

    Publication Year: 1988, Page(s):486 - 492
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (569 KB)

    Coloured-noise Kalman filtering theory is used to deal with glint noise on the position error measurements in a bank-to-turn CLOS guidance system. Frequency-domain analysis suggests that the coloured-filter controller could be replaced by a white-filter controller without any significant loss in performance. Simulation results confirm this conclusion.<> View full abstract»

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  • Robust pole-placement algorithm for adaptive control

    Publication Year: 1988, Page(s):493 - 498
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (497 KB)

    Pole-placement algorithms can be ill conditioned, if the desired closed-loop poles are not appropriately chosen with respect to the open-loop poles. The algorithm used in the paper automatically adjusts the closed-loop poles (within defined limits), to ensure a well conditioned design equation. This facility is particularly useful with adaptive controllers which do not evaluate open-loop poles.< View full abstract»

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  • Frequency-response method for linear multivariable systems simplification

    Publication Year: 1988, Page(s):381 - 394
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1575 KB)

    A frequency response method is presented for the simplification of linear multivariable systems. The method uses the properties of the characteristic loci and characteristic vectors of atransfer function matrix, with coefficients expressed in rational fractions of s, under analytic perturbation. Among other advantages, the order of the reduced model can be prespecified andcertain dynamical charact... View full abstract»

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  • Stochastic time-optimal control problems

    Publication Year: 1988, Page(s):395 - 404
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (768 KB)

    Two types of stochastic time-optimal controls in a one-dimensional setting are considered. Multidimensional problems, in the case of complete state information available and the system modelled by stochastic differential equations, are studied under the formulation of minimising the expected transient-response time. The necessary condition of optimality is the satisfaction for the value function o... View full abstract»

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  • Quantitative design of robust multivariable control systems

    Publication Year: 1988
    IEEE is not the copyright holder of this material | PDF file iconPDF (60 KB)
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  • Quantitative design of robust multivariable control systems

    Publication Year: 1988
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | PDF file iconPDF (60 KB)
    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Parametric identification of nonlinear dynamic systems based on nonlinear crosscorrelation functions

    Publication Year: 1988, Page(s):405 - 420
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1448 KB)

    The paper introduces the two-step identification method of least-squares parameter estimation based on correlation functions, for nonlinear dynamic systems with linear parameters. It deals with the identification of the input/ output parameter models working in open- and closed-loops. The relation between the structure of a model, the choice of multipliers and the necessaryshifting time domain are... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Factored state-space realisation of two-dimensional systems

    Publication Year: 1988, Page(s):421 - 425
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    An algorithm is presented for the factored state-space realisation of two-dimensional (2D) systems. The algorithm is based in the application of the node precedence or ordering concept, used in the synthesis of one-dimensional digital filters, to the 2-D systems. It involves the determination of the continued fraction and its associated signal flow graph from the 2D transfer function. The signal f... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Exact model-matching control of linear discrete-time systems by periodic state or output feedback

    Publication Year: 1988, Page(s):426 - 428
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (242 KB)

    The paper considers an exact modelmatching control problem via periodic stateoutput feedback for discrete-time systems. A frequency-domain approach is employed in which the prototype system (model) is given by the transfer function Gm(Z). The approach is based on equating the closed-loop transfer function Gc(Z) to Gm(Z) and solving the resulting equation for the required feedback again. The solvab... View full abstract»

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  • Adaptive state tracking

    Publication Year: 1988, Page(s):429 - 435
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (628 KB)

    The problem of adaptive state tracking is considered, where a specified state is required to follow the reference input signal. It is assumed that the system is completely controllable and observable, but the particular state is not directly available for measurement and the measurements are contaminated with stochastic noise. It is also assumed that there is little prior knowledge of the referenc... View full abstract»

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  • Minimax design of optimal stochastic multivariable systems

    Publication Year: 1988, Page(s):436 - 440
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (595 KB)

    A new minimax optimal control problem is considered for a stochastic multivariable system. The cost function involves the trace of a weighted sum of spectral density matrices whose frequency response is to be limited. The H¿¿-norm of this scalar function is therefor minimised. To obtain the solution of the minimax control problem, an auxiliary lemma is employed. This enables an equivalent LQG opti... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.