ポンツーン型超大型浮体の波浪中弾性応答特性

概要

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Recently, efficient numerical analysis codes have been developed for pontoon type VLFS with the capability to analyze hydroelastic responses in waves of relatively short periods. In this paper, these numerical results for a 5 km class VLFS are investigated in detail using an analogy with optics laws to clarify the frequency and direction dependent structural response characteristics. When the Airy waves are incident to the pontoon edges at an angle, transmitted flexural waves in the pontoon are shown to be refracted as a consequence of the difference in the wave propagation velocities. For incident angles greater than a critical angles were calculated using Snell's law and compared with the numerical analysis results. Resonance characteristics are also investigated based on the one dimensional wave propagation theory. It is shown that the damping due to the wave radiation, which is independent of the order of the vibration mode, is considerably higher comparing to the ordinary structural damping in the low frequency regions.
社団法人日本船舶海洋工学会の論文