Gudrun Mikota, Horst Ecker,
"Model correlation for special types of rotor systems"
: Proceedings SIRM 2019 - 13th International Conference on Dynamics of Rotating Machines, Copenhagen, Denmark, February 13-15, 2019, Vol. (submitted for publication), 2018
Model correlation for special types of rotor systems
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Proceedings SIRM 2019 - 13th International Conference on Dynamics of Rotating Machines, Copenhagen, Denmark, February 13-15, 2019
The correlation between theoretical and experimental modal models can be quantified by the Modal Assurance
Criterion, which has also been used for rotor systems. However, the conclusions drawn from the
Modal Assurance Criterion may not be valid for non-symmetric systems since the underlying orthogonality
relations are violated. Therefore, a Rotor Correlation Criterion is proposed, which incorporates right and
left eigenvectors, eigenvalues, and mass and stiffness matrices. Applications of model correlation for test
data assessment, sensor placement, mode pairing, and model updating are discussed in the context of rotors.
For two numerical examples, the modified correlation approach is compared to the Modal Assurance
Criterion. Considering the availability of experimentally determined left eigenvectors, these examples deal
with a damped rotor under special support conditions and a purely gyroscopic rotor under more general