On the Motions of a Floating Structure which Consists of Two or Three Blocks with Regid or Pin Joints

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  • On the Motions of a Floating Structure which Consists of Two or Three Blocks with Rigid or Pin Joints
  • On the Motions of a Floating Structure

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Motions of a floating structure which consists of two or three blocks with rigid or pin joints are investigated experimentally and theoretically. Barge and semi-submergible type are adopted as floating structures. The motions in head waves represent heave, pitch, relative angles between blocks, and the internal shearing force and bending moment at the joint part. The strip method is used for the numerical calculations.<BR>From the experiments, the following deductions may be drawn : 1) The rigid joint gives smaller amplitudes of the heave and pitch motions than the pin joint does, on the contrary the amplitudes of the shear force and bending moment get smaller in the pin joint than in the rigid joint. 2) The semi-submergible type obtains smaller amplitudes of the shear force and bending moment than the barge type does, while the amplitudes of heave, pitch and relative angle depend on the length of the incident waves and are the functions of the type of a model, that is to say, in the case of λ/L0<2.0 the semi-submergible model gets smaller amplitudes than the barge model and in the case of λ/L0>2.0 the barge model obtains smaller amplitudes than the semi-sub does. 3) With regard to the relative angle, the three blocks model gets larger amplitude than the two blocks model does.<BR>The comparison of the experimental results with calculated results indicates that the strip method is successful for barge models, even for the three blocks model with the pin joints, however, it shows also that one has to take into account of the effect of the viscous damping of the sectional heave mode, if the corresponding wave making damping is very small and the expected frequency range contains the wave free frequency.

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