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Pade-Type Model Reduction of Second-Order and Higher-Order Linear Dynamical Systems | | Roland W. Freund
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7 Oct 2004 | | Subject: | Numerical Analysis; Dynamical Systems | math.NA math.DS | | Abstract: | A standard approach to reduced-order modeling of higher-order linear dynamical systems is to rewrite the system as an equivalent first-order system and then employ Krylov-subspace techniques for reduced-order modeling of first-order systems. While this approach results in reduced-order models that are characterized as Pade-type or even true Pade approximants of the system’s transfer function, in general, these models do not preserve the form of the original higher-order system. In this paper, we present a new approach to reduced-order modeling of higher-order systems based on projections onto suitably partitioned Krylov basis matrices that are obtained by applying Krylov-subspace techniques to an equivalent first-order system. We show that the resulting reduced-order models preserve the form of the original higher-order system. While the resulting reduced-order models are no longer optimal in the Pade sense, we show that they still satisfy a Pade-type approximation property. We also introduce the notion of Hermitian higher-order linear dynamical systems, and we establish an enhanced Pade-type approximation property in the Hermitian case. | | Source: | arXiv, math.NA/0410195 | | Services: | Forum | Review | PDF | Favorites | |
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