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Modal Reduction Based on Accurate Input-Output Relation Preservation

Majid Khorsand Vakilzadeh (Institutionen för tillämpad mekanik, Dynamik ; Svenskt VindkraftsTekniskt Centrum (SWPTC)) ; Sadegh Rahrovani (Institutionen för tillämpad mekanik, Dynamik) ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik)
opics in Modal Analysis, Volume 7 (Proceeding of IMAC 31st , Conference on Structural Dynamics 2013) (2191-5644). p. 333-342. (2014)
[Konferensbidrag, refereegranskat]

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.

Nyckelord: Modal analysis, Frequency-limited dominancy metric, Unit-impulse response, Model reduction, Linear system dynamics, SWPTC



Denna post skapades 2013-12-20. Senast ändrad 2015-05-04.
CPL Pubid: 190211

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik
Svenskt VindkraftsTekniskt Centrum (SWPTC)

Ämnesområden

Fastkroppsmekanik

Chalmers infrastruktur