Control '96, UKACC International Conference on (Conf. Publ. No. 427)

2-5 Sept. 1996

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Displaying Results 1 - 25 of 132
  • Simulation and control of a multiple effect evaporator

    Publication Year: 1996, Page(s):1166 - 1171 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    Sugar production contains a number of unit operations in series. The most energy consuming unit is the evaporation process. The aim of this paper is to describe the development of a concept to control the product quality and the energy consumption in the evaporation process. Despite extensive use in sugar production the multiple effect evaporator has been a difficult system to analyze and control.... View full abstract»

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  • Adaptive detection of generator out-of-step conditions in power systems using an artificial neural network

    Publication Year: 1996, Page(s):1407 - 1412 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    The application of artificial neural networks (ANN) to power systems has resulted in an overall improvement of solutions in many implementations. This paper presents a new approach for adaptive out-of-step detection of synchronous generators based on neural networks. The paper describes the ANN architecture adopted as well as the selection of the input features for training the ANN. A feedforward ... View full abstract»

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  • Modelling and open-loop performance of a novel active suspension for a road vehicle

    Publication Year: 1996, Page(s):1160 - 1165 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    A two wheeled trailer with a novel active suspension is modelled in this paper. The behaviour of the active suspension system is investigated mathematically and experimentally. The prediction is in good agreement with the experiment. The isolation performance of the active suspension with constant input open-loop control was investigated by using the frequency response function. It is shown that a... View full abstract»

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  • Evaluation of H loop shaping controller design on a process control problem

    Publication Year: 1996, Page(s):1040 - 1045 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    This paper examines the application of an H∞-controller to a typical process control problem. A new weight selection procedure is proposed, which aims to aid the loop-shaping methodology by linking the weight selection directly with a method for estimating achievable bandwidth, based on nominal phase characteristics. The success of the procedur... View full abstract»

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  • μ optimal control of a laboratory plant

    Publication Year: 1996, Page(s):953 - 958 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    The paper presents the design of a robust control for a real plant at laboratory scale. The process considered consists of the production of a C1H dissolution. The control system aim is to maintain the concentration at prescribed values despite variations in the plant, the presence of disturbances and the inherent nonlinearity of the process. The uncertainties in the model are studied and characte... View full abstract»

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  • Standards-a user's perspective

    Publication Year: 1996, Page(s):1402 - 1406 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    There are currently major changes underway within the process industries on how standards are viewed. There is a trend away from in-house company standards towards industry-wide standards. At the same time the standards themselves are taking a "prescriptive" rather than "descriptive" approach. Within Europe standards are being used to enforce legislation aimed at opening the market. This paper loo... View full abstract»

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  • Regional nonlinear H filtering

    Publication Year: 1996, Page(s):1102 - 1106 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    The structure of the nonlinear H∞ filter in the neighborhood of the estimated trajectory is investigated and a bound on the size of the neighborhood that allows this structure is determined, both for finite and infinite horizons. Riccati inequalities that depend on the estimated trajectory are derived for finding the filter gain matrix and an algorithm for calculating the bound on... View full abstract»

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  • Effect of RHP zeros and poles on performance in multivariable systems

    Publication Year: 1996, Page(s):930 - 935 vol.2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    This paper examines the implications of RHP-zeros and poles on performance of multivariable feedback systems. The results quantify the fundamental limitations imposed by RHP-zeros and poles in terms of lower bounds on the peak of the weighted sensitivity and complementary sensitivity functions. View full abstract»

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  • The dynamic positioning of ships: the problems solved?

    Publication Year: 1996, Page(s):1214 - 1219 vol.2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (756 KB)

    DP systems have continued to develop in an attempt to reduce the control problems inherent in trying to control a ship's position. These improvements are commensurate with advances in technology in particular the capacity and the speed of the computing power available. It is expected that this development will continue and that many new applications found for DP will create new problems to solve. ... View full abstract»

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  • Online adaptive control of a low bandwidth active suspension system

    Publication Year: 1996, Page(s):1154 - 1159 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    The paper presents the results of investigative studies involving the performance of a full nonlinear vehicle suspension system configured in a low bandwidth active suspension form. By using a multi-modal control technique the benefits of using an online adaptive scheme are explored and compared to a fixed multi-modal scheme. The vehicle is subjected to differing load conditions and temperatures a... View full abstract»

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  • Water resources sharing planning and management problems

    Publication Year: 1996, Page(s):1034 - 1039 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    The problem of water resources sharing is dealt with in this paper. In the solution of such a problem, water quality constraints have to be taken properly into account, as a considerable reduction of the flow in a river may seriously compromise the surviving of the river ecological system, especially in presence of polluting discharges of sewerage water. The water resources sharing problem may be ... View full abstract»

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  • Path-following and point-stabilization control laws for a wheeled mobile robot

    Publication Year: 1996, Page(s):878 - 883 vol.2
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    Two main problems, concerning wheeled mobile robots, have attracted extensively the attention of many authors in the literature: the path following and the stabilization problems. In this paper, we present a nonlinear pure-state feedback based on partial state feedback linearization and Lyapunov method for the path following problem, and a discontinuous time-varying state feedback for the stabiliz... View full abstract»

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  • Constrained receding horizon predictive control of a binary distillation column

    Publication Year: 1996, Page(s):793 - 798 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    A state space predictive control algorithm, with state constraints at the end-point, is evaluated on a real plant showing nonlinear behaviour. Predictive control techniques based on linear state space model description can find difficulties when applied to a real system with nonlinear behaviour, for example the controlled system may present a steady state offset or bias in the step response. We il... View full abstract»

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  • The impact of industrial standards on product development

    Publication Year: 1996, Page(s):1394 - 1401 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (644 KB)

    This paper describes how the increasing emergence of industrial standards and their enforcement, in particular through European Directives, impacts product development. Although the move towards standardisation is in general very desirable, the increasing difficulties faced by the equipment manufacturers will undoubtedly influence such factors as product cost, the number of suppliers who can still... View full abstract»

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  • Noise control in three-dimensional propagation

    Publication Year: 1996, Page(s):1097 - 1101 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    This paper presents an investigation into the process of noise cancellation in a three-dimensional non-dispersive (linear) propagation medium using a multiple-source system configuration. The process of field cancellation is considered from a frequency-domain viewpoint. The degree of cancellation is analysed in relation to source-related and geometry-related parameters of the system leading to a t... View full abstract»

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  • Structural and predictive aspects of Proportional-Integral-Plus (PIP) control

    Publication Year: 1996, Page(s):1374 - 1379 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    Shows how the non-minimal state space (NMSS)-based PIP-LQ control system design can be constrained to yield exactly the same control algorithm as both GPC and standard, minimal state, LQG design methods. However, while NMSS includes these other approaches as special cases, it is less constrained and so more flexible in general terms: for example, while PIP-LQ has the simplicity of GPC, it is formu... View full abstract»

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  • Control of pH in-line using a neural predictive strategy

    Publication Year: 1996, Page(s):1058 - 1063 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    Control of an experimental in-line pH process exhibiting varying nonlinearity and deadtime is described. A radial basis function (RBF) artificial neural network is used to model the nonlinear dynamics of the process. Accommodation of the varying process deadtime in the neural model is achieved by the generation of a feed-forward signal, for input to the neural network, from a downstream pH measure... View full abstract»

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  • Reachability and controllability of 2-D Roesser model with bounded inputs

    Publication Year: 1996, Page(s):971 - 974 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    The most popular models of two dimensional (2D) linear systems are the discrete models proposed by R.P. Roesser (1975), E. Fornasini and G. Marchesini (1976; 1978) and J. Kurek (1985). It is well known (R.R. Mohler, 1991) that the linear continuous time system x˙=Ax+Bu with u bounded is not completely controllable if the eigenvalues of the system matrix A have negative real parts. Similarly, t... View full abstract»

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  • An all-pass approximation to time delay

    Publication Year: 1996, Page(s):1208 - 1213 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    This paper contemplates a rational transfer function for approximating the time delay operator. This is intended to provide an alternative for approximate realisation of delay blocks, for instance, in controller and estimator schemes, either in discrete or continuous case. The paper discusses some of the most remarkable properties of the function; its all-pass quality, and the simplicity of its st... View full abstract»

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  • An adaptive and robust feedback controller for active control of sound and vibration

    Publication Year: 1996, Page(s):1149 - 1153 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    An adaptive feedback system for the active control of sound and vibration is investigated. The controller combines adaptation for minimum variance of the error, to achieve optimal H2 performance for every disturbance, and H∞ robust stability measures, to account for uncertainties in the plant. An internal model control configuration is used, with a fixed FIR filter for ... View full abstract»

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  • Sensorimotor control in insects and robots

    Publication Year: 1996, Page(s):1254 - 1259 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    Traditional control methods, when applied to sensorimotor control of robots, demand high sensor and actuator accuracy and depend on complex information processing. Biological systems, by contrast, typically depend far more on the physical matching of sensors and actuators to specific tasks and environments so that the appropriate behaviour emerges with relatively little information processing, and... View full abstract»

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  • Hierarchical control scheme for chain-grate stoker coal combustion

    Publication Year: 1996, Page(s):1028 - 1033 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    The control of coal combustion on chain-grate stokers is a complex problem which is of importance to environmental concerns. Producing efficient combustion in spite of material and feed disturbances is a difficult task, allying this to the meeting of stringent emissions criteria even more so. A mathematical model has been used to develop a control scheme, some simulation results of which are shown... View full abstract»

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  • Application of a robust nonlinear fault detection observer to a hydraulic system

    Publication Year: 1996, Page(s):1484 - 1489 vol.2
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    This paper proposes a method for fault detection of a nonlinear system by means of a nonlinear observer. The observer is designed such that the error dynamics are independent of state, input, output and unknown disturbances. The conditions necessary for the observer to exist and be robust with respect to the unknown input are given. The method is applied to a hydraulic test rig and a simulation st... View full abstract»

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  • The importance of structure in PIP control design

    Publication Year: 1996, Page(s):1196 - 1201 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (528 KB)

    The proportional-integral-plus (PIP) controller has great flexibility in design terms. For example, it can be applied to multivariable systems described by backward shift, continuous-time or delta operator models. The present paper has further emphasised the flexibility of the approach in the context of the control structure selected for implementation. It has been demonstrated that the choice of ... View full abstract»

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  • Minimum-time problem for linear second-order conflict-controlled systems

    Publication Year: 1996, Page(s):947 - 952 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    The time optimal problem for linear differential games in the plane is considered. The algorithm for constructing the level sets of the value function is proposed. Numerical examples are presented. View full abstract»

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