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

Date 1-4 Sep 1998

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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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  • A stochastic method for neural-adaptive control of multi-modal nonlinear systems

    Publication Year: 1998, Page(s):49 - 53 vol.1
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    The multiple model adaptive control approach is extended to a class of nonlinear stochastic systems whose underlying functions are unknown and which can change arbitrarily in time. Gaussian radial basis function neural networks are used to learn the nonlinear functions characterising the different plant modes online, without resorting to a separate learning phase. Function estimation, mode change ... 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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  • Robust polynomial pole assignment with stable controller

    Publication Year: 1998, Page(s):469 - 474 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    Stable dynamical controller design and system robustness improvement by polynomial pole assignment are considered. Based on a generic controller form for polynomial pole assignment, a formulation of stable dynamical controllers is proposed. The robustness function in the frequency domain which is used in H robust control design is minimised using the freedom provided by polynomia... View full abstract»

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  • A practical and useful self-learning fuzzy controller

    Publication Year: 1998, Page(s):290 - 295 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    Describes the implementation and application tests of a simple and useful self-learning fuzzy controller. The proposed controller is able to perform a model-free control of time-variable plants with little prior information. Based on a simple and fast learning algorithm that emulates the human learning process, the fuzzy controller self-adapts its control surface at a rate of 150 updates per secon... 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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  • Feedforward networks with one hidden layer and their rates of approximation

    Publication Year: 1998, Page(s):727 - 732 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    We present an overview of some rates of approximation with respect to various computational units in the hidden layer of a one-layered feedforward neural network. The problem of estimating the number of units in the hidden layer is examined to ensure a given degree of approximation for a given function class. The results are discussed in terms of their complexity and functional characteristics View full abstract»

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  • Nonlinear optimal control of vehicle driveline vibrations

    Publication Year: 1998, Page(s):658 - 663 vol.1
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    Describes a simulation study into the control of the first torsional vibration mode-`shuffle'-of vehicle drivetrains. The emphasis is on assessing the influence of system nonlinearities, and to this end a nonlinear design algorithm based on generalised optimal control theory is explored. The relative benefits of the nonlinear control scheme are assessed in comparison with an LQR controller, using ... 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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  • MIMO robustness analysis of digital control systems using genetic algorithms

    Publication Year: 1998, Page(s):263 - 268 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (580 KB)

    An approach to robustness analysis in discrete-time MIMO control systems is developed by using the closed-loop characteristic equation in the presence of gain or phase perturbations. Genetic algorithms are also proposed as the search algorithm for determining the smallest destabilizing perturbations in the form of MIMO gain and phase margins. This technique is computationally more burdensome than ... View full abstract»

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  • Data validation using interval algebra

    Publication Year: 1998, Page(s):404 - 409 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    An application of interval algebra in the diagnosis framework is proposed. After a brief recall concerning interval algebra, the problem of data reconciliation is considered. A formulation of state estimation with measurements represented by intervals is proposed. The problem of fault detection is then tackled. Two model-based procedures of fault detection and isolation using an interval represent... View full abstract»

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  • Fault detection in pipelines using nonlinear observers

    Publication Year: 1998, Page(s):135 - 140 vol.1
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    This paper investigates the detection of faults in an hydraulic pipeline for which both laminar and non-laminar flows are present. A fault detection observer is developed for classes of nonlinear models which are structured in continuous state space form. The observer is designed such that the error dynamics are independent of state, input, output and unknown disturbances. The conditions for the o... View full abstract»

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  • A modular tool wear monitoring system in a metal cutting operation using MLP neural networks and multivariate process parameters

    Publication Year: 1998, Page(s):296 - 301 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    The application of multi-layer perceptron (MLP) neural networks to cutting tool wear classification in a metal turning operation is reported. Cutting tests were conducted using carbide inserts with and without wear on alloy steel, and the acquired multivariate data were used to train, validate and test the classification capabilities of two MLP configurations. Training was achieved via backpropaga... View full abstract»

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  • Plant template generation in quantitative feedback theory

    Publication Year: 1998, Page(s):810 - 815 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    The creation of templates for uncertain plants is an essential first step in quantitative feedback theory and other frequency domain methods. For plants with a general uncertain structure, a method to identify crucial interior points in the uncertain parameter set which map to the boundaries of the plant templates is presented. It is shown that the boundaries of the templates are only generated by... View full abstract»

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  • Managing errors

    Publication Year: 1998, Page(s):578 - 583 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (588 KB)

    It is a fact of life that humans make errors. We attempt to make sense of the world in which we live by making inferences and decisions, solving problems, and drawing conclusions. This creative capability combined with our ability to adapt partly explains why we have been so successful in our environment. But in achieving this success, we also make errors. Most of the errors we make are inconseque... 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 (2)
    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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  • 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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  • Intelligent control toolkit for an advanced control system

    Publication Year: 1998, Page(s):445 - 450 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (700 KB)

    This paper describes the development of a genetic algorithm based nonlinear controller. It builds on the successful integration of the modelling capability of an artificial neural network approach within the advanced control package ConnoisseurTM. The case for the long standing need for a generalised nonlinear controller for handling practical nonlinear and time varying systems is made.... View full abstract»

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  • Bond graphs, symbolic algebra and the modelling of complex systems

    Publication Year: 1998, Page(s):106 - 111 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    The paper discusses the generation of symbolic models of complex systems using hierarchical bond graphs. The uses to which such models can be put include simulation code generation, linearisation, system inversion for actuator sizing and controller design. This methodology is illustrated with reference to three modelling projects: aircraft systems, plastic-onto-wire extrusion and a gravity wave de... View full abstract»

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  • Control of nonlinear time-varying systems using fuzzy relational models

    Publication Year: 1998, Page(s):60 - 65 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    The majority of chemical processes are non-linear in nature. Increasingly, nonlinear models are being used as key parts of chemical plant control schemes. A problem with any model is that it can become inaccurate over time and consequently for good control of time-varying processes some sort of model adaptation is required. In this paper a fuzzy relational model (FRM) is incorporated into a multiv... View full abstract»

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  • Neurofuzzy control of a nonlinear multivariable system

    Publication Year: 1998, Page(s):531 - 536 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    This paper discusses the development of a new multivariable autopilot for simultaneous control of the sway and yaw modes of an autonomous underwater vehicle (AUV) and highlights the requirement for the minimization of cross-coupling effects between these modes. An adaptive network structure has been developed and applied to the task of tuning a novel multivariable fuzzy autopilot. This paper discu... View full abstract»

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  • Selecting inference and defuzzification techniques for fuzzy logic control

    Publication Year: 1998, Page(s):54 - 59 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (476 KB)

    The aim of this work is to form the basis of a methodology to guide the selection of an appropriate fuzzy logic controller for a given task. Different fuzzy inference techniques used in fuzzy logic controllers are compared initially and then the effects of using different defuzzification techniques on the same fuzzy logic controller are examined. The results of these experiments could then be used... View full abstract»

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  • Direct feedback control for polynomial nonlinear systems

    Publication Year: 1998, Page(s):822 - 827 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    A considerable class of nonlinear systems can be described or approximated by polynomial functions with sufficiently high order, therefore can be described in tensor notation compactly. For the plants with polynomial functions in the state and input, a globally stable feedback control, using finite-time tensor product of an augmented state vector, is designed in this paper. Combining the input wit... View full abstract»

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  • Relating information to skill in the control of process plant

    Publication Year: 1998, Page(s):584 - 589 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (600 KB)

    Describes an approach to deal with operating problems caused by failure to provide adequate information to operating staff. It is necessarily brief in explaining the principles behind the approach, rather than flesh out full detail. The method depends upon plant engineers and managers first using task analysis to articulate how their plant should be operated. Then it employs a method of decomposin... View full abstract»

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  • Iterative model-based mixed H2/H control design

    Publication Year: 1998, Page(s):652 - 657 vol.1
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (528 KB)

    Proposes an iterative scheme for mixed H2/H control design using an identified model. The purpose of the mixed H2/H is to combine the traditional H 2 quadratic performance criterion for disturbance rejection with the H performance criterion for the maximum robustness against destabilizing uncertainties. In the ... View full abstract»

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