Numerical Study of Hull Distortion for a Four-Legged Jack-Up Vessel under Diagonal Preloading

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Numerical Study of Hull Distortion for a Four-Legged Jack-Up Vessel under Diagonal Preloading
Title:
Numerical Study of Hull Distortion for a Four-Legged Jack-Up Vessel under Diagonal Preloading
Journal Title:
ISOPE 2024
DOI:
Publication Date:
16 June 2024
Citation:
Wang, XueJun, Liu, ZhuangJian, Lim, Teck-Bin Arthur, Kang, Chang Wei, Mao, HuaWei, Ng, Sze Min, and Jason Cher Kiang Chia. "Numerical Study of Hull Distortion for a Four-Legged Jack-Up Vessel Under Diagonal Preloading." Paper presented at the The 34th International Ocean and Polar Engineering Conference, Rhodes, Greece, June 2024.
Abstract:
This research presents a study on the deformation of a four-legged jackup hull during diagonal preloading. The FE model is developed, including detailed hull structure, stick legs, and equivalent leg-to-hull connections. After that, an analysis framework is established using response surface optimization method to determine the footing boundary conditions for achieving the targeted design preloads on the legs. Design of Experiment (DOE) analysis is conducted to establish response surfaces. The analysis takes stiffness coefficient of the footing springs as input parameters and the reaction forces on the legs as output parameters. Subsequently, optimization is performed to determine the appropriate spring stiffness coefficients for the footing legs. To better understand hull deformation mechanism during diagonal preloading, a schematic model is introduced. With that, potential factors influencing hull deformation and stress are discussed. Case studies and correlation analyses are conducted to identify key parameters accounting for the hull distortion during preloading. These parameters are further examined in the correlation analysis. Additionally, optimization cases are performed to minimize the hull deformation and the hull peak stress. Finally, results are presented and discussed. This is a joint study of Institute of High Performance Computing of A*STAR and Seatrium (SG) towards a better understanding and analysis for challenges posed by diagonal preloading operation of a four-legged jack-up vessel, used in offshore wind-turbine installation.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the IAF-ICP - Digital Design and Optimisation for LNG and Offshore Wind
Grant Reference no. : I2101E0003
Description:
ISBN:
978-1-880653-78-4
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