A two-stage algorithm for identification of nonlinear dynamic systems

Kang Li; Jian-Xun Peng; Er-Wei Bai

doi:10.1016/j.automatica.2006.03.004

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A two-stage algorithm for identification of nonlinear dynamic systems

Journal article

Peer reviewed

A two-stage algorithm for identification of nonlinear dynamic systems

Kang Li, Jian-Xun Peng and Er-Wei Bai

Automatica (Oxford), Vol.42(7), pp.1189-1197

2006

DOI: 10.1016/j.automatica.2006.03.004

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Abstract

This paper investigates the two-stage stepwise identification for a class of nonlinear dynamic systems that can be described by linear-in-the-parameters models, and the model has to be built from a very large pool of basis functions or model terms. The main objective is to improve the compactness of the model that is obtained by the forward stepwise methods, while retaining the computational efficiency. The proposed algorithm first generates an initial model using a forward stepwise procedure. The significance of each selected term is then reviewed at the second stage and all insignificant ones are replaced, resulting in an optimised compact model with significantly improved performance. The main contribution of this paper is that these two stages are performed within a well-defined regression context, leading to significantly reduced computational complexity. The efficiency of the algorithm is confirmed by the computational complexity analysis, and its effectiveness is demonstrated by the simulation results.

Model refinement

Nonlinear system

Forward model selection

Model compactness

System identification

Model structure selection

Computational complexity

Linear-in-the-parameters model

Details

Title: Subtitle: A two-stage algorithm for identification of nonlinear dynamic systems
Creators: Kang Li - School of Electronics, Electrical Engineering and Computer Science, Queen's University Belfast, Belfast BT9 5AH, UK
Jian-Xun Peng - School of Electronics, Electrical Engineering and Computer Science, Queen's University Belfast, Belfast BT9 5AH, UK
Er-Wei Bai - Department of Electrical and Computer Engineering, University of Iowa, Iowa City, IA 52242, USA
Resource Type: Journal article
Publication Details: Automatica (Oxford), Vol.42(7), pp.1189-1197
Publisher: Elsevier Ltd
DOI: 10.1016/j.automatica.2006.03.004
ISSN: 0005-1098
eISSN: 1873-2836
Language: English
Date published: 2006
Academic Unit: Electrical and Computer Engineering
Record Identifier: 9984083259902771

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