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