Time-domain strip method with memory-effect function considering the body nonlinearity of ships in large waves (second report) |
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Authors: | Takashi Mikami Masashi Kashiwagi |
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Institution: | (1) Akishima Laboratories (Mitsui Zosen) Inc., 1-50, 1-chome Tsutsujigaoka, Akishima Tokyo, 196-0012, Japan;(2) Osaka University, 2-1 Yamada-oka, Suita Osaka, 565-0871, Japan |
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Abstract: | In the previous paper, one of the authors proposed a new time-domain nonlinear strip method for a rigid body, in which hydrodynamic
forces are evaluated by a convolution integral with the memory function computed for the instantaneous submerged part of the
transverse sections, and the Froude–Krylov and hydrostatic forces are evaluated on the instantaneous wetted hull surface.
In this paper, first, that nonlinear strip method is extended for an elastic body using a method of superposition of elastic
mode functions, which enabled us to investigate whipping phenomena due to impulsive large waves. Second, the influence of
different approximations of the pressure above the still-water surface is investigated, and then the results calculated by
the proposed nonlinear strip method are compared with the experimental ones. Third, whipping phenomena observed for an elastic
body at higher Froude numbers are studied through a comparison between computed and measured results. Higher-frequency vibrations
in the vertical bending moment due to slamming are discussed. Furthermore, the wave load due to green water on deck is calculated
by introducing a practical model, and the effects of the green water on responses of both rigid and elastic bodies are investigated. |
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Keywords: | Nonlinear strip method Impact pressure Whipping Green-water load |
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