FRAC and RVAC

Formulated in the same fashion as MAC, the Frequency Response Assurance Criteria (FRAC), is a degree of freedom correlation tools that provides a measure of the similarity between an analytical and experimental frequency response function. The technique allows for some stiffness compensation for shifted frequencies but can produce confusing results when mode switching occurs in modes; damping applied for the finite element model is also a concern.

Formulated in the same fashion as MAC, the Response Vector Assurance Criteria (RVAC), is a vector correlation tools that provides a measure of the similarity between an analytical and experimental vector at a particular frequency. This technique is useful for identifying the similarity between and analytical and experimental response vector at a particular frequency.

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