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On dominant poles and model reduction of second order time-delay systems
2012 (English)In: Applied Numerical Mathematics, ISSN 0168-9274, E-ISSN 1873-5460, Vol. 62, no 1, 21-34 p.Article in journal (Refereed) Published
Abstract [en]

The method known as the dominant pole algorithm (DPA) has previously been successfully used in combination with model order reduction techniques to approximate standard linear time-invariant dynamical systems and second order dynamical systems. In this paper, we show how this approach can be adapted to a class of second order delay systems, which are large scale nonlinear problems whose transfer functions have an infinite number of simple poles. Deflation is a very important ingredient for this type of methods. Because of the nonlinearity, many deflation approaches for linear systems are not applicable. We therefore propose an alternative technique that essentially removes computed poles from the systemʼs input and output vectors. In general, this technique changes the residues, and hence, modifies the order of dominance of the poles, but we prove that, under certain conditions, the residues stay near the original residues. The new algorithm is illustrated by numerical examples.

Place, publisher, year, edition, pages
2012. Vol. 62, no 1, 21-34 p.
Keyword [en]
Second order time-delay system; Dominant poles; Residue; Eigenvalue problem; Model order reduction
National Category
Computer and Information Sciences
Identifiers
URN: urn:nbn:se:kth:diva-53363DOI: 10.1016/j.apnum.2011.09.005ISI: 000297956000002Scopus ID: 2-s2.0-81055156812OAI: oai:DiVA.org:kth-53363DiVA: diva2:469992
Funder
Swedish e‐Science Research Center
Note

QC 20120103

Available from: 2011-12-27 Created: 2011-12-27 Last updated: 2018-01-12Bibliographically approved

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Jarlebring, Elias

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