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

2-5 Sept. 1996

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  • Control system parameter identification using the population based incremental learning (PBIL)

    Publication Year: 1996, Page(s):1309 - 1314 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    In this paper a technique of how a stochastic search and optimisation technique dubbed the population based incremental learning can be used for parameter identification of continuous control system models, is presented. This method is an abstraction of a simple genetic algorithm (GA) which maintains all the statistical properties of a GA but removes the genetic recombination operators. The method... View full abstract»

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  • A comparison of controllers based on models estimated in the time and frequency domains

    Publication Year: 1996, Page(s):1303 - 1308 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    In this paper, we study two identification methods, based on the frequency and time domains, applied to a benchmark model proposed by M'Saad (1991) for different conditions of noise, saturation, disturbances. Furthermore, we use the different estimated models with a well known control design technique to give a range of different controllers for the same specifications of the controlled process. T... View full abstract»

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  • State bounding with minimal volume ellipsoids

    Publication Year: 1996, Page(s):1297 - 1302 vol.2
    Cited by:  Papers (6)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    The paper presents recursive algorithms for guaranteed state estimation using ellipsoidal bounds on the state of the system and the process and observation noises. Alternative techniques are used in the observation update to find an ellipsoid containing the feasible set. The resulting algorithms have significantly differing accuracy and computational requirements. Simulation compares their perform... 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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  • Root locus of chaotic attractors

    Publication Year: 1996, Page(s):1220 - 1225 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    The virtues of chaotic behaviour are listed, the problem of synthesis of chaos is stated and demonstrated on examples provided first in R3 by Chua (1986) and then in Rn, n≥3, by the authors, a systematic way (a scenario) for the synthesis of chaos is given. The classical root locus is useful for both approaches to chaos synthesis. Trajectory root locus is introduced to bot... View full abstract»

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  • Identification in the time and frequency domains: a comparison using the ECC bench-mark model

    Publication Year: 1996, Page(s):1290 - 1296 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (588 KB)

    A comparison is made between the time domain identification of z-domain models and frequency domain identification of s-domain models. Each approach has specific advantages, which depend on the intended application of the estimated model. The use of periodic excitation signals is also examined and their advantages discussed. The application of time and frequency domain techniques is illustrated us... View full abstract»

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  • Biological temporal sequence processing and its application in robot control

    Publication Year: 1996, Page(s):1266 - 1271 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (548 KB)

    We describe an approach to the control of autonomous mobile robots which uses learnt sequences over time of pairs of sensory stimuli and motor actions, so-called sensory-action sequences (SAS), to build an internal model of the world in which the robot is navigating. The hypothesis presented is that the behaviour of an autonomous robot, as with that of an animal, in the learning and performance of... 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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  • 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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  • Integral control with saturating input

    Publication Year: 1996, Page(s):805 - 808 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (252 KB)

    In this paper we consider the problem of integral low-gain control of stable finite-dimensional, single-input single-output systems with positive steady-state gain. The linear plant is subject to a sector-bounded actuator nonlinearity such as saturation or dead-zone. We show that provided the integral gain is small enough then the closed-loop system is globally stable, and arbitrary stepped refere... 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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  • System identification via genetic programming

    Publication Year: 1996, Page(s):912 - 917 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (608 KB)

    Compared to bit string coded GAs, GP is a more powerful system identification tool. However, there is no guarantee that GP will produce an exact solution. Perhaps that is the price associated with the increased flexibility of the paradigm. Bancroft (1995) reported that, failures to discover the correct model structure of time series were attributed to high levels of coloured noise and the presence... View full abstract»

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  • Enhanced self-tuning control with application to a combined heat and power system

    Publication Year: 1996, Page(s):1064 - 1069 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    This paper describes enhanced self-tuning control methods which have been tailored for application to the speed control of a gas engine driven combined heat and power system. The enhanced algorithms have been developed to accommodate for improved estimation and overall control of systems exhibiting fast dynamic and nonlinear behaviour. Refinements that are required to be made to enable the techniq... View full abstract»

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  • Spatial decomposition as a tool for the evaluation and design of cross-directional control systems in sheet metal rolling

    Publication Year: 1996, Page(s):1284 - 1289 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    Over supply in many segments of the metal strip manufacturing industry drives a need to achieve improved product quality and yield from existing mill stock. This demands improved process control, which is achieved though a range of commercially available actuators, most of which can be used on existing mills. However, these actuators are expensive and frequently their effect on product quality can... 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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  • ANN-based fault diagnosis method with a combined BP algorithm

    Publication Year: 1996, Page(s):861 - 866 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    This paper presents a knowledge acquisition approach for an ANN-based fault diagnosis expert system. A hierarchical classification diagnostic model is used in this system for the problems of complicated system. The model is implemented by a multiple structure neural network composed of some subnetworks. A improved backpropagation (BP) learning algorithm combined with conjugate gradient method and ... 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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  • Design of robust controllers for a milk of lime blending tank

    Publication Year: 1996, Page(s):799 - 804 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    This paper presents the use of an industrial milk of lime blending tank (MLBT) for the design and evaluation of different robust controllers. The plant is a multi-input, multi-output non-linear system with high interaction between loops and large disturbance actions. The IMC, H and μ methods are used to design controllers which provide robust stability as well as good nominal ... View full abstract»

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  • Application of an expert system for robust controller design

    Publication Year: 1996, Page(s):1004 - 1009 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    This paper describes an expert system and its application to robust control system design. The need for expert systems to aid practising control engineers to perform robust control systems design is discussed. A brief introduction of the H loop shaping design procedure is included. The role of expert systems in robust control systems design is discussed. We outline the structure ... View full abstract»

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  • Noninteracting control of nonlinear singular systems

    Publication Year: 1996, Page(s):1242 - 1247 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    This paper discusses a noninteracting control problem for affine nonlinear singular systems. An algorithm is proposed, providing a sequence of integers for the system. It is shown that such integers are invariant under the restricted equivalent transformation and the regular feedback. Sufficient and necessary conditions for the solvability of the noninteracting control problem are derived. An exam... View full abstract»

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  • Optimal quadratic filtering of quantization noise in non-Gaussian systems

    Publication Year: 1996, Page(s):1091 - 1096 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    This work deals with the problem of state estimation for a class of discrete time linear systems forced by non-Gaussian noise where the quantization on measured output is modeled, as usual, as additive noise having uniform probability distribution. The best linear estimate, computed through the Kalman filter, in this case may not give good results. To improve the covariance of the estimation error... View full abstract»

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  • Sliding mode state observers for SISO linear discrete-time systems

    Publication Year: 1996, Page(s):837 - 842 vol.2
    Cited by:  Papers (16)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    Discrete-time sliding mode observer design for SISO systems is discussed. The sliding lattice is a new approach in sliding mode control design. For discrete-time systems sliding points exist on a hyperplane which we call the sliding lattice. Asymptotically stable observer design and the stability of reconstruction error systems using the Lyapunov direct method are presented. Techniques for finding... 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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  • Application of basis functions to the cross-directional control of web processes

    Publication Year: 1996, Page(s):1278 - 1283 vol.2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (512 KB)

    The paper considers three approaches to the cross-directional (CD) control of web processes namely, the direct solution of the partial differential equation (PDE), 2-D polynomial methods and interaction matrix approaches. In each case, the model of the response of the actuators used as the basis of the control design is related back to the underlying PDE description of the process. For the interac... View full abstract»

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  • The use of social insect based control methods with multiple robot systems

    Publication Year: 1996, Page(s):1260 - 1265 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (576 KB)

    This paper presents an overview of some of the social insect control methods which could be used with multiple behaviour based robots, together with some examples from robotics, simulated robots, and more abstract computational domains supporting mobile agents. It considers the characteristics of such control methods, and highlights some advantages and disadvantages in relation to conventional met... View full abstract»

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