Development of Serveral New Tools for Pre-Test Evaluation - IMAC 14

J.P.DeClerck, P.Avitabile

Specification of the set of test degrees of freedom (DOFs) for an experimental modal survey can be extremely important, especially when the test is being conducted for eventual validation or updating of an existing finite element model. Currently, only a few tools exist to assist in the specification of the set of test points needed.

Using a significantly reduced set of finite element DOFs that is much larger than the those DOF set that will actually be measured, analyses are performed to obtain a very selective set of test measurement DOF. Several new, graphic tools have been developed to assist in the specification of this set of test DOFs needed to perform a successful test/analysis correlation study. Existing tools such as Modal Assurance Criterion (MAC), Coordinate Modal Assurance Criterion (CoMAC), and Coordinate Orthogonality (CORTHOG) are compared to newly developed tools such as the Mode Shape Summation Plot (MSSP), Mode Power Plot (MPP) and the CORTHOG Pretest Plot (CPP). These new tools are applied to a simple case.

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