Definition and calculation method of modal effective mass of asymmetric fluid-structure interaction system for seismic analysis

In this paper, modal effective mass for asymmetric fluid-structure interaction system is defined and equations for its calculation is derived. To establish consistency, modal effective mass in symmetric structure only system is briefly reviewed, followed by a definition of the modal effective mass i...

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Bibliographic Details
Published in:Nuclear engineering and technology 2023, 55(12), , pp.4307-4316
Main Authors: Heo, Yong-Hwa, Sun, Jong-Oh, Kim, Gyeong Ho, Choo, Yeonseok
Format: Article
Language:English
Subjects:
Asymmetric system
Fluid-structure interaction
Modal analysis
Modal effective mass
Seismic analysis
원자력공학
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Summary:In this paper, modal effective mass for asymmetric fluid-structure interaction system is defined and equations for its calculation is derived. To establish consistency, modal effective mass in symmetric structure only system is briefly reviewed, followed by a definition of the modal effective mass in asymmetric system. The equations for calculating modal effective mass in asymmetric system are derived by utilizing the properties of left and right eigenvectors. To simplify the equations, the assumption is made that the mass matrix is only affected by the fluid. The simplified equation is then compared to the equation already used in ANSYS. Finally, the validity of the modal effective mass definition and derivation in this paper is demonstrated through a simple example.
ISSN:1738-5733
2234-358X
DOI:10.1016/j.net.2023.08.010