On the relation between NARX clusters and even/odd nonlinearities through frequency-domain analysis
type: Item
instance of: scholarly article
title: On the relation between NARX clusters and even/odd nonlinearities through frequency-domain analysis
zbMATH Open document ID: 1407.93143
DOI: 10.1155/2014/650737
author: Alexandro G. Brito
author: Waldemar Castro Leite Filho
author: Elder Moreira Hemerly
published in: Mathematical Problems in Engineering
publication date: 2019-02-08T00:00:00Z
review text: Summary: Although polynomial NARX models have been intensively used in nonlinear system identification, few papers discussed how to relate the inner nonlinearities to specific types of clusters and regressors. The objective of this paper is to discuss this relationship for a class of systems that contain even or odd nonlinearities. This class covers block-structured models (Hammerstein, Wiener, and others) and systems with dynamic nonlinearities. To achieve the paper's aim, a deep frequency-domain analysis is performed. For each type of nonlinearity, all the NARX clusters are investigated and the results show that each regressor type provides specific nonlinear contribution. The investigation is based on an output power spectra analysis when a specific multisinusoidal excitation is applied. According to the spectral contributions in some of the frequency lines, the nonlinearity classification is possible. By applying the same procedure to the clusters, one interprets how these clusters can (or not) contribute to explain the system nonlinearity. The paper findings have two major impacts: (i) one gains deep knowledge on how the nonlinearities are coded by the clusters, and (ii) this information can be used, for instance, to aid a structure selection procedure (ERR, term clustering, etc.) during the discarding of the clusters which are not able to explain the system nonlinear behavior. Some practical and experimental aspects are discussed, while numerical examples are presented to show the validity of the theoretical analysis.
Mathematics Subject Classification ID: 93C10
Mathematics Subject Classification ID: 93B30
zbMATH DE Number: 7016947
Wikidata QID: Q59068621
MaRDI profile type: Publication
full work available at URL: https://doi.org/10.1155/2014/650737
OpenAlex ID: W1991088700
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description: scientific article; zbMATH DE number 7016947