Motions of a Floating Elastic Plate in Waves

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This paper deals with three-dimensional responses of a very large floating structure in head and quartering seas. First we estimate three-dimensional dry-eigenmodes of a completely free plate by employing a finite element method. Then, hydrodynamic pressures exerted on the plate are evaluated by combining a pressure distribution method and the dry-eigenmodes. Wave-induced motions of the plate are finally determined by solving a set of equations of wave-induced motion in the principal coordinates. Present modal analysis method is verified through comparisons of calculated amplitudes of vertical motions and instantaneous shapes of a plate model in head seas with available measured data. They show reasonable agreements. Next, we apply this method to the large floating module of 300m × 60m, and investigate the motions of it and the disturbance waves around it in head and quartering seas. Finally, the response amplitude operators of the first 10 modes in all heading waves with various wave lengths are shown.
社団法人日本船舶海洋工学会の論文