Time-domain moment matching for multiple-input multiple-output linear time-invariant models
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Published version
Author(s)
Shakib, Mohammad Fahim
Scarciotti, Giordano
Pogromsky, A Yu
Pavlov, Alexey
van de Wouw, Nathan
Type
Journal Article
Abstract
Model reduction by moment matching for linear time-invariant (LTI) models is a reduction technique that has a clear interpretation in the Laplace domain. In particular, for the multiple-input multiple-output (MIMO) LTI case, Krylov subspace methods aim at matching the transfer-function matrix (and possibly its derivatives) of the reduced-order model to the transfer-function matrix of the full-order model along so-called tangential directions at desired interpolation points. A straightforward application of time-domain moment matching to MIMO LTI models does not result in such a match in the transfer-function matrix. In this paper, we derive a relation between the MIMO transfer-function matrices of the full- and the reduced-order models that follows from the application of time-domain moment matching on MIMO LTI models. This is subsequently exploited to formulate conditions on the parameters of time-domain moment matching under which the transfer-function matrix is matched along tangential directions, thus ensuring consistency with classical Krylov subspace methods.
Date Issued
2023-06
Date Acceptance
2023-01-25
Citation
Automatica, 2023, 152, pp.1-8
ISSN
0005-1098
Publisher
Elsevier
Start Page
1
End Page
8
Journal / Book Title
Automatica
Volume
152
Copyright Statement
© 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license. (http://creativecommons.org/licenses/by/4.0/).
License URL
Identifier
https://www.sciencedirect.com/science/article/pii/S0005109823000857
Publication Status
Published
Article Number
110935
Date Publish Online
2023-03-09