The Modal Observability Correlation as a Modal Correlation Metric
Paper in proceeding, 2014

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.

Auto-correlation

Modal assurance criterion (MAC)

Cross-correlation

Mode Contribution

Eigenmode

Author

Vahid Yaghoubi Nasrabadi

Dynamics

Thomas Abrahamsson

Dynamics

Conference Proceedings of the Society for Experimental Mechanics Series

21915644 (ISSN) 21915652 (eISSN)

Vol. 45 7 487-494
9781461465843 (ISBN)

Subject Categories

Mechanical Engineering

DOI

10.1007/978-1-4614-6585-0_47

ISBN

9781461465843

More information

Latest update

8/8/2023 6