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Estimating the frequency response of a system in the presence of an integrator

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Widanage, Widanalage Dhammika, Omara, N., Schoukens, J. and Van Mierlo, J. (2015) Estimating the frequency response of a system in the presence of an integrator. Control Engineering Practice, Volume 35 . pp. 1-11. doi:10.1016/j.conengprac.2014.10.007

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Official URL: http://dx.doi.org/10.1016/j.conengprac.2014.10.007

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Abstract

A system with an integrator is one which does not have a steady-state gain at zero frequency. An example is a battery; when subjected to a constant charge or discharge current the voltage will continuously increase or decrease until the cell reaches its maximum/minimum cut-off voltage and not reach a steady-state value. Frequency response estimation techniques that minimises leakage errors lead to significant errors at low frequencies of the response. This paper develops and presents a technique whereby the low frequency errors are eliminated. The technique is applied over the frequencies of interest, except DC frequency, and gives better results over windowing and a local polynomial frequency response estimation method. As such, an accurate low frequency response and noise power spectrum can now be obtained which in turn can be used for estimating accurate parametric models.

Item Type: Journal Article
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): System identification, Frequency response (Dynamics), Engineering -- Statistical methods, Automatic control.
Journal or Publication Title: Control Engineering Practice
Publisher: Elsevier Ltd
ISSN: 0967-0661
Official Date: February 2015
Dates:
DateEvent
February 2015Published
21 November 2014Available
24 October 2014Accepted
15 April 2013Submitted
Volume: Volume 35
Page Range: pp. 1-11
DOI: 10.1016/j.conengprac.2014.10.007
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: European Commission (EC), Flemish Government (Methusalem), Federal Government IAP VII
Open Access Version:
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