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Coupling of Sloshing and Ship Motions
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- Olav F. Rognebakke
- MARINTEK, SINTEF Group
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- Odd M. Faltinsen
- Norwegian University of Science and Technology
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Description
<jats:p>The coupled effect between ship motions and sloshing is studied. Two-dimensional experiments of a hull section containing tanks filled with different levels of water excited in sway by regular waves have been conducted. Steady-state results are obtained for the sway amplitude. Even if violent sloshing occurs in the tanks, the steady-state motion is almost linear and sinusoidal with the frequency of the linear incident waves. This implies that higher-order harmonics of the sloshing force are filtered out by the system. Simulations of the modeled case are performed using a linear and a nonlinear sloshing model and mainly assuming linear external flow. For steady-state motion, a convolution formulation does not improve the results relative to using constant coefficients in the equation of motion. However, in order to properly model the transient behavior in an irregular sea, a convolution formulation must be included. The treatment of the retardation function for the external problem is discussed in detail. A good agreement between experiments and computations is reported. The calculated coupled motion is sensitive to the damping of the sloshing motion in a certain frequency range where the coupled sloshing and ship motions cause resonant ship motions. A quasilinear frequency domain analysis is used to explain this by introducing the sloshing loads as a frequency dependent spring.</jats:p>
Journal
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- Journal of Ship Research
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Journal of Ship Research 47 (03), 208-221, 2003-09-01
The Society of Naval Architects and Marine Engineers
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Details 詳細情報について
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- CRID
- 1363388843418782848
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- ISSN
- 15420604
- 00224502
- http://id.crossref.org/issn/00224502
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- Data Source
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- Crossref