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Report No.
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Dynamic analysis of liquid-filled shells

not registered 

Fluid-structure interaction affects dynamic characteristics of LMFBR reactor structures, and should be taken into consideration in their seismic safety evalutions. This is due to that a reactor vessel of LMFBR is relatively thin-walled structure and it contains a large amount of liquid metal sodlum. In this study, natural frequencies of liquid-filled tanks (a flat bottom end plate type and a spherical head type) were analyzed by FINAS with a purpose of understanding the dynamic behavior of liquid-filled tanks. The analysis results by FINAS were found to be satisfactory accurate as compared to the exliting solutions. And a computational study was made on vibration characteristics of tanks and follwing knowledge was obtaind. (1)The lowest natural frequency of a shell takes place not in a beam mode, but in a higher order (5th$$sim$$10th) shell mode. (2)In case of a tank with a spherical head, elgenmode shapes are very complex; The spherical head part tends to vibrate mainly in the lower order shell modes, and the cylinderical part vibrate in the higher order modes. (3)The center of the spherical head becomes a nodal point in the beam modes and the shell modes. But in the axial modes, the center becomes a point of maximum amplitude.

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