Optimal estimation of parameters of dynamical systems by neural network collocation method

In this paper we propose a new method to estimate parameters of a dynamical system from observation data on the basis of a neural network collocation method. We construct an object function consisting of squared residuals of dynamical model equations at collocation points and squared deviations of t...

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Bibliographic Details
Published in:Computer physics communications 2003-02, Vol.150 (3), p.215-234
Main Authors: Liaqat, Ali, Fukuhara, Makoto, Takeda, Tatsuoki
Format: Article
Language:English
Subjects:
Data assimilation
Inverse problem
Lorenz equations
Neural network
Parameter estimation
Ship roll motion
Weak constraint formulation
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Summary:In this paper we propose a new method to estimate parameters of a dynamical system from observation data on the basis of a neural network collocation method. We construct an object function consisting of squared residuals of dynamical model equations at collocation points and squared deviations of the observations from their corresponding computed values. The neural network is then trained by optimizing the object function. The proposed method is demonstrated by performing several numerical experiments for the optimal estimates of parameters for two different nonlinear systems. Firstly, we consider the weakly and highly nonlinear cases of the Lorenz model and apply the method to estimate the optimum values of parameters for the two cases under various conditions. Then we apply it to estimate the parameters of one-dimensional oscillator with nonlinear damping and restoring terms representing the nonlinear ship roll motion under various conditions. Satisfactory results have been obtained for both the problems.
ISSN:0010-4655
1879-2944
DOI:10.1016/S0010-4655(02)00680-X