In order to get an overview of the correlation process, let's look at each of the pieces of this picture above.

(You can pick a tag below or click on an area of the screen above)

1) The finite element model

2) The experimental modal test

3) The correlation of the analytical and experimental models

This can be done with a variety of tools:

• MAC - The first check usually is a vector correlation (without mass scaling) using the Modal Assurance Criteria

• CoMAC - Then a check of the degree of freedom correlation (without mass scaling) using the Coordinate Modal Assurance Criteria can be performed

• POC - Once this is done a vector correlation (with mass scaling) using the Pseudo Orthogonality Check can be performed

• REDUCTION - side issue to this orthogonality check is the reduction of the model.

• CORTHOG - Then a check of the degree of freedom correlation (with mass scaling) using the Coordinate Orthogonality Check can be performed

• FRAC - Using measured frequency response function data, another degree of freedom correlation check can be made using the Frequency Response Assurance Criteria

• RVAC - Using measured frequency response function data, another vector correlation check can be made using the Response Vector Assurance Criteria
  

4) The updating of the model

 

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