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PREDICTION OF RELATIVE MOTIONS OF SHIPS IN REGULAR WAVES

Zhifu Zhou, Minhui Gu

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Abstract

The total relative motion in the bow region of a ship consists of components that include the ship motions itself and the motions caused by the incident waves, the radiated waves and the diffracted waves, as well as the waves due to the steady forward speed. The relative motion components of ships are predicted using a 3-D potential theory. A fast algorithm is presented for computation of 3-D ship relative motions at a moderate forward speed. The Green functions are separated into two terms. One is the Green function in the zero speed case, another is an added term due to the forward speed. The numerical results are in good agreement with the experimental data.

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What this paper is about

The total relative motion in the bow region of a ship consists of components that include the ship motions itself and the motions caused by the incident waves, the radiated waves and the diffracted waves, as well as the waves due to the steady forward speed. The relative motion components of ships are predicted using a 3-D potential theory. A fast algorithm is presented for computation of 3-D ship relative motions at a moderate forward speed. The Green functions are separated into two terms. One is the Green function in the zero speed case, another is an added term due to the forward speed. The numerical results are in good agreement with the experimental data.

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Available abstract

The total relative motion in the bow region of a ship consists of components that include the ship motions itself and the motions caused by the incident waves, the radiated waves and the diffracted waves, as well as the waves due to the steady forward speed. The relative motion components of ships are predicted using a 3-D potential theory. A fast algorithm is presented for computation of 3-D ship relative motions at a moderate forward speed. The Green functions are separated into two terms. One is the Green function in the zero speed case, another is an added term due to the forward speed. The numerical results are in good agreement with the experimental data.

Key concepts: Ship motions, Motion (physics), Computation, Relative velocity, Response amplitude operator, Physics, Relative motion, Diffraction

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