Mass and Stiffness Orthogonality Checks Without a Mass or Stiffness Matrix - IMAC 13

P.Avitabile, J.O'Callahan

Correlation between analytical and experimental modal vectors can be verified by performing a Pseudo Orthogonality Check with the system mass or stiffness matrices at either the set of tested degrees of freedom or at the full set of finite element degress of freedom. This can require a significant effort in order to obtain the system matrices in the proper form to perform this check. In addition, many hurdles must be overcome in order obtain all the data in the proper form on a specific hardware platform.

By re-casting the equations in a different form, Pseudo Orthogonality Checks can be performed without the system mass and stiffness matrices with no difference in the resulting matrices. This saves a tremendous amount of computation time and effort in performing this correlation study.

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In the meantime, e-mail Peter_Avitabile@uml.edu for copy of paper