Modal Reduction Based on Accurate Input-Output Relation Preservation
Paper in proceeding, 2014

An eigenmode based model reduction technique is proposed to obtain low-order models which contain the dominant eigenvalue subspace of the full system. A frequency-limited interval dominancy is introduced to this technique to measure the output deviation caused by deflation of eigenvalues from the original system in the frequency range of interest. Thus, the dominant eigensolutions with effective contribution can be identified and retained in the reduced-order model. This metric is an explicit formula in terms of the corresponding eigensolution. Hence, the reduction can be made at a low computational cost. In addition, the retained low-order model does not contain any uncontrollable and unobservable eigensolutions. The performance of the created reduced-order models, in regard to the approximation error, is examined by applying three different input signals; unit-impulse, unit-step and linear chirp.

Modal analysis

Unit-impulse response

Linear system dynamics

Model reduction

Frequency-limited dominancy metric

SWPTC

Author

Majid Khorsand Vakilzadeh

Dynamics

Swedish Wind Power Technology Center (SWPTC)

Sadegh Rahrovani

Dynamics

Thomas Abrahamsson

Dynamics

Conference Proceedings of the Society for Experimental Mechanics Series

21915644 (ISSN) 21915652 (eISSN)

7 333-342
978-1-4614-6584-3 (ISBN)

Subject Categories

Applied Mechanics

DOI

10.1007/978-1-4614-6585-0_31

ISBN

978-1-4614-6584-3

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8/8/2023 6