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http://dx.doi.org/10.5000/EESK.2011.15.6.011

Analysis of Experimental Modal Properties of an Electric Cabinet via a Forced Vibration Test Using a Shaker  

Cho, Sung-Gook ((주)제이스코리아 기술연구소)
So, Gi-Hwan ((주)제이스코리아 기술연구소)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.15, no.6, 2011 , pp. 11-18 More about this Journal
Abstract
Accurate modal identification analysis is required to reasonably perform a seismic qualification of safety-related electric equipment installed in nuclear power plants (NPPs). This study evaluates a variation of the modal properties of an electric equipment cabinet structure in NPPs according to the excitation levels. For the study, an actual electric equipment cabinet was selected as a specimen and was dynamically tested by using a portable exciter in accordance with the level of input vibration energy. Tests were classified into two sets: with-door cases, and without-door cases. Frequency response functions were computed from the signals of the acceleration responses and input motions measured from the vibration tests. A polynomial curve fitting algorithm was used to extract the modal properties from the frequency response functions. This study reviews the variation of the modal properties according to the variation of the excitation levels. The results of the study show that the modal frequencies and the modal dampings of the object specimen varies nonlinearly according to the excitation level of the test motion. Attaching the door increases the modal damping of the cabinet.
Keywords
Electric equipment; Seismic qualification; Modal identification; Cabinet; Vibration test; Modal property; Nonlinear;
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Times Cited By KSCI : 1  (Citation Analysis)
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