### Abstract

Based on the strip theory, a method for predicting the nonlinear wave loads of a ship advancing in large oblique waves is proposed in the paper. With the previous well progress in the hydrodynamics, the hydrodynamic coefficients and forces can be well estimated. Therefore in the study, the authors consider the ship as a free-free beam and use the simple beam theory to estimate the corresponding sea loads along the ship hull, e.g. wave bending moment, shear force and torsion moment at any ship section. The numerical solutions for the linear analysis in frequency domain are firstly made and the accuracy has been verified by comparing with the existing experimental data and theory done by others. With the well developed linear theory, the analytical model of the nonlinear wave loads for a ship in large oblique waves are further developed The time domain analyses including the instant grid generation technique (IGGT) for the corresponding sea loads are made. Besides, to avoid the numerical drift phenomena in the sway and yaw mode motion, the Artificial Restoring Force Technique (ARFT) and Digital Filter Technique (DFT) are applied to solve five coupled equations of motions. A series of analyses are made in the paper and some valuable suggestions are also submitted, which will be helpful for the researchers to do the related works. The calculation procedures developed here may be considered as a useful analytical tool for predicting the ship motions and wave induced loads.

Original language | English |
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Title of host publication | Proceedings of the International Offshore and Polar Engineering Conference |

Editors | J.S. Chung, C.H. Kim, M. Olagnon, S. Naito |

Publisher | Int Soc of Offshore and Polar Engineerns (ISOPE) |

Pages | 552-558 |

Number of pages | 7 |

Volume | 3 |

Publication status | Published - 1997 |

Event | Proceedings of the 1997 7th International Offshore and Polar Engineering Conference. Part 3 (of 4) - Honolulu, HI, USA Duration: 1997 May 25 → 1997 May 30 |

### Other

Other | Proceedings of the 1997 7th International Offshore and Polar Engineering Conference. Part 3 (of 4) |
---|---|

City | Honolulu, HI, USA |

Period | 97-05-25 → 97-05-30 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Ocean Engineering

### Cite this

*Proceedings of the International Offshore and Polar Engineering Conference*(Vol. 3, pp. 552-558). Int Soc of Offshore and Polar Engineerns (ISOPE).

}

*Proceedings of the International Offshore and Polar Engineering Conference.*vol. 3, Int Soc of Offshore and Polar Engineerns (ISOPE), pp. 552-558, Proceedings of the 1997 7th International Offshore and Polar Engineering Conference. Part 3 (of 4), Honolulu, HI, USA, 97-05-25.

**Nonlinear wave loads on a ship advancing in waves.** / Fang, Ming-Chung; Liao, Cheng Ming.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Nonlinear wave loads on a ship advancing in waves

AU - Fang, Ming-Chung

AU - Liao, Cheng Ming

PY - 1997

Y1 - 1997

N2 - Based on the strip theory, a method for predicting the nonlinear wave loads of a ship advancing in large oblique waves is proposed in the paper. With the previous well progress in the hydrodynamics, the hydrodynamic coefficients and forces can be well estimated. Therefore in the study, the authors consider the ship as a free-free beam and use the simple beam theory to estimate the corresponding sea loads along the ship hull, e.g. wave bending moment, shear force and torsion moment at any ship section. The numerical solutions for the linear analysis in frequency domain are firstly made and the accuracy has been verified by comparing with the existing experimental data and theory done by others. With the well developed linear theory, the analytical model of the nonlinear wave loads for a ship in large oblique waves are further developed The time domain analyses including the instant grid generation technique (IGGT) for the corresponding sea loads are made. Besides, to avoid the numerical drift phenomena in the sway and yaw mode motion, the Artificial Restoring Force Technique (ARFT) and Digital Filter Technique (DFT) are applied to solve five coupled equations of motions. A series of analyses are made in the paper and some valuable suggestions are also submitted, which will be helpful for the researchers to do the related works. The calculation procedures developed here may be considered as a useful analytical tool for predicting the ship motions and wave induced loads.

AB - Based on the strip theory, a method for predicting the nonlinear wave loads of a ship advancing in large oblique waves is proposed in the paper. With the previous well progress in the hydrodynamics, the hydrodynamic coefficients and forces can be well estimated. Therefore in the study, the authors consider the ship as a free-free beam and use the simple beam theory to estimate the corresponding sea loads along the ship hull, e.g. wave bending moment, shear force and torsion moment at any ship section. The numerical solutions for the linear analysis in frequency domain are firstly made and the accuracy has been verified by comparing with the existing experimental data and theory done by others. With the well developed linear theory, the analytical model of the nonlinear wave loads for a ship in large oblique waves are further developed The time domain analyses including the instant grid generation technique (IGGT) for the corresponding sea loads are made. Besides, to avoid the numerical drift phenomena in the sway and yaw mode motion, the Artificial Restoring Force Technique (ARFT) and Digital Filter Technique (DFT) are applied to solve five coupled equations of motions. A series of analyses are made in the paper and some valuable suggestions are also submitted, which will be helpful for the researchers to do the related works. The calculation procedures developed here may be considered as a useful analytical tool for predicting the ship motions and wave induced loads.

UR - http://www.scopus.com/inward/record.url?scp=0030672473&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030672473&partnerID=8YFLogxK

M3 - Conference contribution

VL - 3

SP - 552

EP - 558

BT - Proceedings of the International Offshore and Polar Engineering Conference

A2 - Chung, J.S.

A2 - Kim, C.H.

A2 - Olagnon, M.

A2 - Naito, S.

PB - Int Soc of Offshore and Polar Engineerns (ISOPE)

ER -