Control '98. UKACC International Conference on (Conf. Publ. No. 455)

1-4 Sep 1998

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Displaying Results 1 - 25 of 153
  • An LMI-based machining logic fusion

    Publication Year: 1998, Page(s):519 - 524 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    Discusses the issues of robust machining process controller synthesis. In practical cases, operating conditions have strong effects on the process dynamics, and it is very difficult to use a fixed controller to achieve a satisfactory performance. Here, a fuzzy logic inference mechanism is introduced to adjust the controller according to the online measurements of operating variables which define t... View full abstract»

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  • Fuzzy power system stabilizer including a fuzzy PI controller

    Publication Year: 1998, Page(s):865 - 870 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    The use of power system stabilizers (PSS) has become very common in operation of large electric power systems since the early seventies. However, it was very difficult to design a stabilizer that could present good performance in all operating points of electric power systems. Fuzzy logic control has been suggested as a possible solution to overcome this problem, by using linguistic information an... View full abstract»

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  • Automating the Batik colouring process. I. An investigation of colouring kinetics on woven fabrics

    Publication Year: 1998, Page(s):224 - 228 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    Unlike textile printing technology, which has advanced rapidly and enjoys modern technological capabilities in most of the production processes, the Batik industry has changed little in the past few decades. Although the rapid technological advancement in this decade has influenced the Malaysian Batik industry to adopt new technology in some of the processes, there are many more processes which ar... View full abstract»

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  • Learning and control by vector field modelling

    Publication Year: 1998, Page(s):775 - 780 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    An online method is developed for learning a model of a dynamic process, which can be used to implement control through a form of feedback linearisation. Simulation results are presented to demonstrate the applicability of the method in control of nonlinear and time-varying systems View full abstract»

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  • Evaluation of a remote boundary pressure control strategy using Simulink

    Publication Year: 1998, Page(s):129 - 134 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (380 KB)

    The emphasis within British Gas has moved from the construction aspects of the natural gas transmission system, to one of investigating methods of optimising the operational efficiency of the existing pipeline network. In particular, the developments which have taken place in the area of microprocessor technology have provided the opportunity to implement improved control strategies in areas where... View full abstract»

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  • A real-time simulation of a 200 MW thermal power plant for optimising combustion control

    Publication Year: 1998, Page(s):859 - 864 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (764 KB)

    This paper gave an overview of the work being carried out by The Queen's University of Belfast TOPGEN project. The development implementation of a data server for monitoring and storing data from the Ballylumford power plant in Northern Ireland was presented. A computer power plant model was designed and validated using data collected by the data server. This plant model formed the basis of a virt... View full abstract»

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  • Fuzzy modelling of a pilot plant rotary dryer

    Publication Year: 1998, Page(s):515 - 518 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    A fuzzy model is developed for a rotary dryer. The model is implemented using a linguistic equations (LE) approach. The method is suitable for the modelling of a rotary dryer with fast tuning properties. The model is applied to a pilot plant rotary dryer located in Control Engineering Laboratory at Oulu University View full abstract»

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  • Evolving hybrid RBF-MLP networks using combined genetic/unsupervised/supervised learning

    Publication Year: 1998, Page(s):330 - 335 vol.1
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    Introduces a hybrid neural structure using radial-basis function (RBF) and multilayer perceptron (MLP) networks. The hybrid network is composed of one RBF network and a number of MLPs, and is trained using a combined genetic/unsupervised/supervised learning algorithm. Genetic and unsupervised learning algorithms are used to locate centres of the RBF part in the hybrid network. In addition, a super... View full abstract»

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  • Feedback stabilization of imperfectly known nonlinear time-delay systems of the neutral type

    Publication Year: 1998, Page(s):561 - 566 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    Addresses the problem of stabilizing a class of imperfectly known nonlinear time-delay systems of the neutral type; that is the time-delays occur in the state velocity vector. The imperfections are modelled as nonlinear perturbations influencing a known nominal time-delay system and may be time, state, delayed-state and/or input-dependent. Adopting a deterministic methodology based on Lyapunov sta... View full abstract»

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  • Continuous learning automata and adaptive digital filter design

    Publication Year: 1998, Page(s):100 - 105 vol.1
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    In the design of adaptive IIR filters, the multi-modal nature of the error surfaces can limit the use of gradient-based and other iterative search methods. Stochastic learning automata have previously been shown to have global optimisation properties making them suitable for the optimisation of filter coefficients. Continuous action reinforcement learning automata are presented as an extension to ... View full abstract»

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  • Auto-tuning and controller design for unstable time delay processes

    Publication Year: 1998, Page(s):769 - 774 vol.1
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    A single relay feedback test is used to identify exact model parameters of unstable first order plus delay and second order plus delay transfer functions. It is shown that a limit cycle only exists if the time delay is less than a certain value and that this can be increased by adding PD feedback. A systematic PI-PD and PID controller tuning method, based on standard forms with a variable zero, is... View full abstract»

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  • Robust stability for nonlinear sampled-data control systems and Aizerman's conjecture

    Publication Year: 1998, Page(s):646 - 651 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (416 KB)

    The robust stability criterion for sampled-data control systems with a sector nonlinearity was presented in our previous papers (1996, 1998). Although it is applicable only to the sampled-data control system of a certain class, a usual discrete-time control system belongs to this type of class. The criterion contains the robust stability condition in regard to the nonlinear allowable band (sector)... View full abstract»

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  • Multivariate SPC using radial basis functions

    Publication Year: 1998, Page(s):479 - 484 vol.1
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    Advances in computing and instrumentation have led to a major increase in the data logging capabilities of many modern chemical plants, which has in turn led to enhanced interest in dimensionally-reducing statistical techniques such as principal component analysis (PCA). The paper analyses linear PCA, and proposes a nonlinear extension of this methodology using a series of radial basis function (R... View full abstract»

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  • An improved parameter estimation method using limit cycle data

    Publication Year: 1998, Page(s):682 - 687 vol.1
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    The paper introduces the A-locus method which is an exact method for limit cycle investigation in relay controlled loops for parameter estimation for stable FOPDT and SOPDT transfer functions. The method has also been extended to unstable FOPDT and SOPDT transfer functions since it is possible to have unstable plant models for some chemical processes. The method gives two advantages. First, the st... View full abstract»

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  • The use of symbolic algebra for sliding mode controller design

    Publication Year: 1998, Page(s):123 - 128 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    Dynamic sliding mode control policies based around differential input-output system representations provide a relatively general solution to the problem of robust control of nonlinear systems. This paper considers the implementation of these schemes within symbolic computation packages to provide a nonlinear sliding mode controller design environment View full abstract»

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  • Event-driven algorithms of incremental logic computations using generalized decision diagrams

    Publication Year: 1998, Page(s):853 - 858 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (580 KB)

    This paper presents a specific class of incremental computations adapted for re-evaluation of logic functions in discrete-event systems. Algorithms are divided onto two parts: a dynamic part, which runs online and computes response for an event, and a pre-computation, which prepares the internal data model for a coming event. The common property of the algorithms is their complexity, bounded rathe... View full abstract»

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  • Industrial control: set-points for 2010

    Publication Year: 1998, Page(s):1 - 10 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (892 KB)

    Control is a core enabling technology for industry. It underpins many economically related factors including quality, efficiency and safety. In recent years, additional pressures have arisen from the globalization of markets and the world wide concern for environmental issues. These pressures will lead to increased emphasis on control in the future. Also, the technologies underpinning control scie... View full abstract»

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  • A practical approach for training dynamic recurrent neural networks: use of a priori information

    Publication Year: 1998, Page(s):324 - 329 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    Presents a technique for incorporating a priori knowledge from a state space system into a neural network training algorithm. The training algorithm considered is that of chemotaxis and the networks being trained are recurrent neural networks. Incorporation of the a priori knowledge ensures that the resultant network has behaviour similar to the system which is it modelling View full abstract»

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  • Delayed generalized predictive control

    Publication Year: 1998, Page(s):793 - 797 vol.1
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    This paper presents an alternative approach to the traditional generalized predictive control (GPC) presented by Clarke et al. (1987). The specific aim is to provide a new controller with control increment u(t) depending on the past values of the output y(t-k), y(t-k-l), ... at the present time t in order to represent the computational delays and/or compensate for system structural characteristics... View full abstract»

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  • Power rectifier ASIC controller

    Publication Year: 1998, Page(s):219 - 223 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    Presents the application specific integrated circuit (ASIC) implementation of an accurate digital control for the three phase six pulse controlled rectifiers, which was achieved using electronic design automation (EDA) techniques. The controller was simulated and then implemented in two field programmable gate arrays (FPGAs). The complete three phase six pulse rectifier system including the ASIC c... View full abstract»

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  • Adaptive control of systems described by nonlinear functional differential equations

    Publication Year: 1998, Page(s):763 - 768 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    For a class of uncertain systems, described by controlled nonlinear functional differential equations, an adaptive feedback strategy is presented which guarantees that, for every system of the class and for every admissible reference signal r(·), the system output y(·) asymptotically tracks r(·), in the sense that the error y(t)-r(t)→0 as t→∞, whilst maintainin... View full abstract»

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  • Stability analysis and stabilization of a class of nonlinear systems based on stability radii

    Publication Year: 1998, Page(s):641 - 645 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    The concept of stability radii, first proposed by Charles Van Loan (1985), is a measure of robust stability for linear systems. In this paper, the exponential stability and robust stabilization of a class of nonlinear systems are discussed. The class of nonlinear systems under consideration are the ones that can be separated into a nominal linear part plus a nonlinear perturbation with the linear ... View full abstract»

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  • Parametrization of all stable stablizing controllers

    Publication Year: 1998, Page(s):475 - 478 vol.1
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    The Youla parametrization of all stabilizing controllers is addressed using a stable controller. First a stable central controller is obtained. Then a constructive procedure to find the Youla free parameter Q is given such that the overall controller is stable View full abstract»

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  • Linear model identification toolbox for dynamic systems

    Publication Year: 1998, Page(s):676 - 681 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (564 KB)

    A new methodology for model structure identification is presented. This is implemented as a new toolbox of MATLAB. The methodology developed has two parts, the first one has the objective to find a pure delay using the estimated impulse response, and the second one, uses at same time the minimal value of the identification criteria and the representative value of numerator coefficients. The graphi... View full abstract»

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  • Stabilisation of power systems by a reduced dynamic output controller

    Publication Year: 1998, Page(s):158 - 162 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    A practical new approach to the design of an excitation based power system stabiliser is presented. The problem is formulated as a standard static state feedback control problem, for which a static state feedback controller is designed. The state controller is then projected to an output controller from which the stabiliser parameters are deduced in a straightforward manner. A power system compris... View full abstract»

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