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Identification and Control of Nonlinear Systems Using Haar Wvelet Networks

Sokho Chang/Seok Won Lee/Boo Hee Nam
Transaction on Control Automation, and Systems Engineering, vol. 2, no. 3, pp.169-174, 2000

Abstract : In this paper, Haar wavelet-based neural network is described for the identification and control of discrete-time nonlinear dynamical systems. Wavelets are suited to depict functions with local nonlinearities and fast variations because of their intrinsic properties of finite support and self-similarity. Due to the orthonormal properties of Haar wavelet functions, wavelet neural networks result in a greatly simplified training problem. This wavelet-based scheme performs adaptively both the identification of nonlinear functions and the control of the overall system, while the multilayer neural network is applied to the control system just after its sufficient learning of the unknown functions. Simulation shows that the wavelet network can be a good alternative to a multilayer neural network with backpropagation.

Keyword : wavelet network, neural network

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