Correlation Considerations - Degree of Freedom Correlation Techniques - Part 5 - IMAC 16

W.Heylen, P.Avitabile

There are many issues pertaining to the correlation of finite element models with data from an experimental modal test. Topics such as model reduction, model expansion, testing techniques employed and correlation tools utilized are all important issues to the success of the correlation process. This particular paper addresses some of the pertinent issues of correlation beyond the vector correlation typically utilized (MAC and Orthogonality) and extends the correlation process into degree of freedom based correlation tools. These tools can be broken down into modal vector DOF correlation techniques and frequency response function DOF correlation techniques. Several different techniques are presented which identify discrepancies between modal vectors by degree of freedom such as the Coordinate Modal Assurance Criteria, Enhanced Coordinate Modal Assurance Criteria and the Coordinate Orthogonality Check and frequency response functions by the Frequency Response Assurance Criteria. The basic correlation techniques are reviewed and several cases are presented to compare the various techniques. Advantages and disadvantages of each of the techniques are discussed.

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