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The Modal Observability Correlation as a Modal Correlation Metric

Vahid Yaghoubi (Institutionen för tillämpad mekanik, Dynamik) ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik)
Conference Proceedings of the Society for Experimental Mechanics Series (2191-5644). Vol. 45 (2014), 7, p. 487-494.
[Konferensbidrag, refereegranskat]

The historical development of the Modal Assurance Criterion (MAC) originated from the need of a correlation metric for comparingexperimental modal vectors, estimated from measured data, to eigenvectors that have been determined from finite element calculation. For systems with well separated eigenvalues with many system degrees-of-freedom (DOF) represented in the eigenvectors it is normally easy to distinguish eigenvectors associated to different eigenvalues by low MAC correlation numbers. However, for eigenvectors with a sparse DOF sampling it may be hard to distinguish between vectors by MAC correlation numbers. To reduce the problem of distinguishing between eigensolutions, this paper advocates the use of a new correlation metric based on the observability matrix of the diagonal state-space realization. This is instead of using a metric based on the eigenvectors only. © The Society for Experimental Mechanics 2014.

Nyckelord: Auto-correlation , Cross-correlation , Eigenmode , Modal assurance criterion (MAC) , Mode Contribution



Denna post skapades 2014-06-22. Senast ändrad 2014-09-02.
CPL Pubid: 199458

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik

Ämnesområden

Maskinteknik

Chalmers infrastruktur