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SIMULATION OF MOTIONS OF MOORED VESSEL IN WAVES AND COMPARISONS WITH MEASURED ONE

Takeshi Kinoshita, Hideaki Maeda, CELSO KAZUYUKI MOROOKA

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Abstract

Motions of a moored barge and a semisubmersible in waves are simulated, using a quadratic response transfer function computed from a pressure integral over the wetted surface of the body. Some of the motions are compared with experimental data, and are found to conform to them, provided the added mass and the damping force in still water are modified in waves. Further simulation shows that a natural frequency appears in the motion as well as in the frequency of the wave envelope for a lowly damped system, such as a moored barge.

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What this paper is about

Motions of a moored barge and a semisubmersible in waves are simulated, using a quadratic response transfer function computed from a pressure integral over the wetted surface of the body. Some of the motions are compared with experimental data, and are found to conform to them, provided the added mass and the damping force in still water are modified in waves. Further simulation shows that a natural frequency appears in the motion as well as in the frequency of the wave envelope for a lowly damped system, such as a moored barge.

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Available abstract

Motions of a moored barge and a semisubmersible in waves are simulated, using a quadratic response transfer function computed from a pressure integral over the wetted surface of the body. Some of the motions are compared with experimental data, and are found to conform to them, provided the added mass and the damping force in still water are modified in waves. Further simulation shows that a natural frequency appears in the motion as well as in the frequency of the wave envelope for a lowly damped system, such as a moored barge.

Key concepts: BARGE, Envelope (radar), Added mass, Mechanics, Marine engineering, Ship motions, Wind wave, Natural frequency

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