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| Wave Loads of a 150 000-ton FPSO in Extreme Environment of a Sea Area |
| Received:March 05, 2024 Revised:April 01, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.04.013 |
| KeyWord:FPSO potential theory extreme wave RAO horizontal bending moment acceleration |
| Author | Institution |
| LIU Zhongbai |
CNOOC Energy Technology & Service-Oil Production Services Co., Guangdong Shenzhen , China |
| GAO Ningbo |
Wuhan Institute of Shipbuilding Technology, Wuhan , China |
| TANG Xintong |
China Classification Society Ocean Engineering Technology Center, Tianjin , China |
| XU Yejun |
CNOOC Energy Technology & Service-Oil Production Services Co., Guangdong Shenzhen , China |
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| Abstract: |
| The work aims to evaluate the hydrodynamic characteristics of a typical cross section of a 150 000-ton FPSO under extreme wave conditions, occurring in a once-in-a-century wave climate in the South China Sea to obtain the extreme load imposed on the FPSO and use it as a critical control parameter for the FPSO’s dry-dock retrofit. Based on the domestically developed 3D frequency-domain linear potential flow software COMPASS-WALCS, a wet surface grid model of the 150 000-ton FPSO was constructed. The three-dimensional diffraction-radiation theory was used to calculate the hydrodynamic loads on wet surface and the water pressure results on each diffraction unit were directly mapped onto the structural model for computation. Spectral analysis was employed to analyze the once-in-a-century wave climate resulting in short-term extreme motion responses. By analyzing the response amplitude operator (RAO) and wave energy spectral density, the response spectrum under extreme waves was obtained to predict various statistical values for the short-term vessel motion and wave loads. Statistical method was used to determine the maximum short-term response. The extreme load values of Fr143 cross section in the middle of the ship, namely vertical bending moment, vertical shear force and profile center acceleration, were calculated. It was found that the bending moment of the ship was the largest when facing the wave, and the bending moment gradually decreased with the increase of the wave angle, while the vertical shear force of the cross section gradually increased with the increase of the wave angle. It can be concluded that the FPSO experiences more hazardous loads when facing extreme waves at large wave angles which require special attention and consideration. |
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