Model reduction by moment matching with preservation of global stability for a class of nonlinear models
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Published version
Author(s)
Shakib, Mohammad Fahim
Scarciotti, Giordano
Pogromsky, AY
Pavlov, A
van de Wouw, N
Type
Journal Article
Abstract
Model reduction by time-domain moment matching naturally extends to nonlinear models, where the notion of moments has a local nature stemming from the center manifold theorem. In this paper, the notion of moments of nonlinear models is extended to the global case and is, subsequently, utilized for model order reduction of convergent Lur’e-type nonlinear models. This model order reduction approach preserves the Lur’e-type model structure, inherits the frequency-response function interpretation of moment matching, preserves the convergence property, and allows formulating a posteriori error bound. By the grace of the
preservation of the convergence property, the reduced-order Lur’e-type model can be reliably used for generalized excitation signals without exhibiting instability issues. In a case study, the reduced-order model accurately matches the moment of the full-order Lur’e-type model and accurately describes the steady-state model response under input variations.
preservation of the convergence property, the reduced-order Lur’e-type model can be reliably used for generalized excitation signals without exhibiting instability issues. In a case study, the reduced-order model accurately matches the moment of the full-order Lur’e-type model and accurately describes the steady-state model response under input variations.
Date Issued
2023-11-01
Date Acceptance
2023-05-23
Citation
Automatica, 2023, 157
ISSN
0005-1098
Publisher
Elsevier
Journal / Book Title
Automatica
Volume
157
Copyright Statement
© 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
License URL
Publication Status
Published
Article Number
ARTN 111227
Date Publish Online
2023-08-19