Strip theories applied to the vertical motions of high speed crafts |
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Authors: | F Prez Arribas JA Clemente Fernndez |
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Institution: | aNaval Architecture School of Madrid, Universidad Politécnica de Madrid, Avenida Arco de la Victoria SN, 28040 Madrid, Spain;bNAVANTIA San Fernando Shipyard, Avenida de la Carraca SN, Cádiz, Spain |
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Abstract: | The motions of a high speed craft are highly influenced by speed and dynamic forces that begin to be important for high Froude numbers. Classical ship motions theories and some seakeeping programs do not include the effect of these dynamic forces that mainly affect to the damping of vertical motions, and have to be corrected to model high speed crafts. In any other way, the use of these theories or programs would be unrealistic. In this paper, some theories that can be used to predict the seakeeping behaviour of high speed crafts, considering dynamic forces, are studied and validated against seakeeping tests of some fast monohulls models. Tests and results focus on vertical motions in head seas, which are the most severe for these fast crafts. Experimental results of vertical motions are compared with numerical calculations and conclusions about the range of application of the presented theories are obtained. |
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Keywords: | Seakeeping Fast crafts Ship motions Strip theory Ship dynamics Potential flow |
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