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IEE Proceedings D - Control Theory and Applications

Issue 4 • Date July 1991

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Displaying Results 1 - 15 of 15
  • Chaos prediction in nonlinear feedback systems

    Publication Year: 1991, Page(s):313 - 320
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (661 KB)

    Investigates the chaotic behaviour of nonlinear feedback systems. A heuristic model of this phenomenon is proposed and applied. Conditions for the existence and the location of chaotic motions are derived in terms of simple relations among the parameters of the system. Two examples show the application of the method and its approximation is discussed.<> View full abstract»

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  • Model reference adaptive control for large scale systems with application to power systems

    Publication Year: 1991, Page(s):321 - 326
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (438 KB)

    Presents a new direct model reference adaptive control algorithm for a class of large scale interconnected systems. It is assumed that the system is subjected to bounded disturbances and is characterised by unknown constant parameters which take values within a known bounded range. Conditions are determined under which the adaptive control law guarantees boundedness of the controller parameters an... View full abstract»

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  • Determination of transfer function of two dimensional generalised systems using the discrete Fourier transform

    Publication Year: 1991, Page(s):327 - 330
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (231 KB)

    A systematic and conceptually simple algorithm is presented for the determination of the transfer function for two-dimensional generalised or singular systems. The method uses the discrete Fourier transform (DFT) and can easily be applied. The simplicity and efficiency of the algorithm are illustrated by two examples.<> View full abstract»

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  • On the design of position control systems

    Publication Year: 1991, Page(s):331 - 336
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    Using as an example a simple position control with narrow accuracy requirements, the paper makes a comparison of a number of design methods. It demonstrates that, by considering the phase-plane, simple piecewise-linear controllers can be designed to achieve excellent performance in competition with more sophisticated methods. Nonlinear suboptimal controllers are considered; it is shown that 'pessi... View full abstract»

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  • Elevator scheduling system using blackboard architecture

    Publication Year: 1991, Page(s):337 - 346
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (719 KB)

    Describes the use of the blackboard architecture for the traffic control of group automatic operation of elevators in a multistorey building. The performance of the elevator system is measured by two indicators: system response time and system service time. A blackboard system was implemented in Prolog and the opportunistic type of problem-solving offered by the blackboard architecture succeeded i... View full abstract»

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  • Constrained receding-horizon predictive control

    Publication Year: 1991, Page(s):347 - 354
    Cited by:  Papers (78)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (541 KB)

    Constrained receding-horizon predictive control (CRHPC) is intended for demanding control applications where conventional predictive control designs can fail. The idea behind CRHPC is to optimise a quadratic function over a 'costing horizon' subject to the condition that the output matches the reference value over a further constraint range. Theorems show that the method stabilises general linear ... View full abstract»

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  • Transputer implementation of Kalman filters

    Publication Year: 1991, Page(s):355 - 362
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (633 KB)

    The paper is concerned with transputer implementations of three forms of the Kalman filter algorithm. Two approaches to a concurrent realisation are considered, involving heuristic partitioning of the conventional sequential algorithm and proposing a new strategy for mapping the systolic array descriptions onto parallel processors. Real-time implementation results on transputer networks are presen... View full abstract»

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  • Feedback stabilisation of synchronous generator by extended linearisation

    Publication Year: 1991, Page(s):363 - 371
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (571 KB)

    The concept of extended linearisation for nonlinear control design yields control systems for which the linearisations have eigenvalues independent of the operating point. The computations of the procedure is complicated. There are systems where the parameterisation of the operating points by the input cannot be directly applied. A novel method of parameterisation of the operating point which over... View full abstract»

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  • Frequency-domain approach to state-space LQG self-tuning control

    Publication Year: 1991, Page(s):372 - 380
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    A state-space self-tuning LQG regulator is obtained. The algorithm differs from other state-space approaches since the controller and estimator are found by polynomial equations rather than matrix manipulation. The approach arises naturally from the Wiener theory of control, rather than the steady-state Kalman theory of other work. An example is given of the control of an open-loop, unstable and n... View full abstract»

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  • Expert system for SROOT

    Publication Year: 1991, Page(s):381 - 387
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    The development of an expert system in the domain of computer-aided control systems design is presented. An expert system has been developed and incorporated into an existing control systems design package called SROOT. The combined software is used to design linear single variable systems using the root locus techniques. The expert system provides software-based design expertise involving control... View full abstract»

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  • Rational function matrices and structural controllability and observability

    Publication Year: 1991, Page(s):388 - 394
    Cited by:  Papers (20)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (516 KB)

    A matrix is said to be a rational function matrix (RFM) if each entry in the matrix is a rational function of independent parameters with real coefficients. A linear time-invariant system is said to be a rational function system (RFS) if each of its coefficient matrices is a RFM. The Lebesque measure of the set of points in the parameter space of a RFS is introduced to define structural controllab... View full abstract»

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  • Strip speed measurement using distributed infra-red detectors

    Publication Year: 1991, Page(s):395 - 399
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (415 KB)

    A non-contact method for measuring the speed of electrically conducting strip over the range of speeds found in industry is described. The method is thermal in character and relies on the ability of the strip to store heat for short periods of time. A wavelength-sensitive reading head consisting of an array of equally spaced infra-red detectors senses the heat pattern present on the moving strip. ... View full abstract»

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  • Electro-rheological valves in a hydraulic circuit

    Publication Year: 1991, Page(s):400 - 404
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (383 KB)

    An electro-rheological (ER) or 'smart' fluid changes from a fluid to a solid when a high electric field is applied to it. The effect is reversible and can be used in hydraulic valves with no moving parts and fast response times. One way to utilise the effect is presented. A simple equation to predict the controlled power is derived.<> View full abstract»

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  • Optimal controller with prescribed dominant energy eigenvalues

    Publication Year: 1991, Page(s):405 - 409
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (354 KB)

    An optimal controller with prescribed dominant energy eigenvalues is proposed. The closed-loop control system preserves some of the eigenvalues of the original system. The eigenvalues selected to shift into the desired region are determined using the concept of dominant energy modes. A systematic design method, for sequentially finding the weighting matrix elements and the feedback gains of the co... View full abstract»

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  • Phase margin of linear time invariant systems from Routh array

    Publication Year: 1991, Page(s):410 - 412
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    A simple method to determine the gain margin of linear time invariant systems (LTIS) employing Routh stability criterion was developed in an earlier paper. The term 'stability ratio' was defined connecting the marginal gain K/sub m/ determined from the Routh array and the actual gain K of the system. This established a direct link between the Routh criterion and the gain margin. It was also shown ... View full abstract»

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