LNGキャリヤの球形タンクの振動について

概要

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Vibration characteristics of the MRV-type spherical tank system of LNG carrier have been investigated. Vibrations of a spherical tank supported by a skirt were computed by FEM program as an axisymmetrical shell structure. The spherical tank has two kinds of vibration pattern, one of which is specified as the bending mode and another the tension-compression mode. The bending mode has lower frequency and should be taken into consideration of propeller excited vibrations. Simplified formulae to calculate the fundamental frequencies of vertical and horizontal vibrations of the tank system have been introduced. An added mass effect of internal LNG on the natural frequency of the tank system has been studied. The natural frequency of the tank system filled with LNG is reduced to about 25% of that of the empty tank though the density of LNG is half of the water density. Vibratory response of the tank system was studied and lower response was predicted. A full scale experiment is on schedule in order to make comfirmation of the predicted vibration characteristics.
社団法人日本船舶海洋工学会の論文
1982-03-03