TAILIEUCHUNG - Neural networks for modelling and control

A comprehensive introduction to the most popular class of neural network, the multilayer perceptron, showing how it can be used for system identification and control. The book provides readers with a sufficient theoretical background to understand the characteristics of different methods, and to be aware of the pit-falls so as to make the correct decisions in all situations. This is a very application-oriented text that gives detailed and pragmatic recommendations to guide users through the plethora of methods suggested in the literature. Furthermore, it introduces sound working procedures that can lead to efficient neural network solutions. Invaluable to the practitioner. | Neural networks for modelling and control Eric Ronco and Peter J. Gawthrop Centre for System and Control Department of Mechanical Engineering University of Glasgow ericr@ peterg@ Technical Report CSC97008 November 10 1997 Abstract This report is a review of the main neurcecontrol technologies. Two main kinds of neuro-control approaches are distinguished. One entails developing a single controller from a neural network and the other one embeds a number of controllers inside a neural network. The single neuro-control approaches are mainly system inverse the inverse of the system dynamics is used to control the system in an open loop manner. The Multi-Layer Perceptron MLP is widely used for this purpose although there is no guarantee that. it. can succeed in learning to control the plant and that more importantly the unclear representation it achieves prohibits the analysis of its learned control properties. These problems and the fact that open loop control is not suitable for many systems highly restricts the usefulness of the MLP for control purposes. However the non-linear modelling capability of the MLP could be exploited to enhance model based predictive control approaches since essentially an accurate model of the plant is all that is required to apply this method. The second neurcwontrol approach can be seen as a modular approach since different controllers are used for the control of different components of the systems. The main modular neuro-controllers are listed. They are all characterised by a gating system used to select the the modular units . controllers or models valid for the computing of a current input pattern. These neural networks are referred to as the Gated Modular Neural Networks GMNNs . Two of these networks are particularly fitted for modelling oriented control purposes. They are the Local Model Network LMN and the Multiple Switched Models MSM . Since the local models of the plant are linear it is fairly easy .

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