接水タンク構造の呼吸モードと動的流体圧分布について

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Marine structures are often in contact with inner or outer fluid as stern, ballast and oil tanks. The effect of interaction between fluid and structure has to be taken into consideration when we estimate the dynamic response of the structure appropriately. Fatigue damages can also be sometimes observed in these tanks which seem to be caused by resonance. Thin walled tank structures in ships which are in contact with water and located near engin or propeller where vibration characteristics are strongly affected by the added mass of containing water. Therefore it is essentially important to estimate the added mass to predict vibration characteristics of tank structures. But it is difficult to estimate exactly the magnitude of the added mass because this is a fluid-structure interaction problem and is affected by the free surface, vibration modes of structural panels and the depth of water. We have developed a numerical tool of vibration analysis and pressure distribution of 3-dimensional tank structure using finite elements for plates and boundary elements for fluid region. In the previous report, vibration analysis of water tanks has been performed by the authors. In the present report, to verify the present analysis, we have made an experiment for vibration characteristics of a tank with elastic opposite panels. And the effect of added mass of containing water, the effect of structural constraint between panels on the vibration characteristics and dynamic pressure distribution in the fluid are investigated numerically and discussed. Especially natural frequencies and hydrodynamic pressure of breath mode of the water tank are focused on.
社団法人日本船舶海洋工学会の論文
2000-03-29

接水タンク構造の呼吸モードと動的流体圧分布について

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