TY - GEN
T1 - A numerical analysis of the response and air gap demand for semi-submersibles
AU - Kurniawan, Adi
AU - Huang, Zhenhua
AU - Li, Jing
AU - Liu, Chunrong
AU - Wang, Xikun
AU - Hao, Zhiyong
AU - Tan, Soon Keat
AU - Nah, Edwin
PY - 2009/12/1
Y1 - 2009/12/1
N2 - This paper examines the effects of viscous damping on the prediction of air gap demand for semi-submersibles. This is illustrated by a case study of a typical six-column, double pontoon semi-submersible in irregular waves. Linear responses of the platform and free-surface elevations at selected locations are computed using WAMIT, in which viscous damping effects are included through the use of a linear damping matrix. The spectra of the platform's response and of the relative free-surface elevation at the selected locations, as well as the probability distributions of air gap minima obtained using different damping matrices are compared. It is demonstrated that correct modelling of viscous damping is important for an accurate prediction of air gap demand of a floating platform, especially if the peak frequency of the wave spectrum is close to the heave, roll, and pitch natural frequencies of the platform.
AB - This paper examines the effects of viscous damping on the prediction of air gap demand for semi-submersibles. This is illustrated by a case study of a typical six-column, double pontoon semi-submersible in irregular waves. Linear responses of the platform and free-surface elevations at selected locations are computed using WAMIT, in which viscous damping effects are included through the use of a linear damping matrix. The spectra of the platform's response and of the relative free-surface elevation at the selected locations, as well as the probability distributions of air gap minima obtained using different damping matrices are compared. It is demonstrated that correct modelling of viscous damping is important for an accurate prediction of air gap demand of a floating platform, especially if the peak frequency of the wave spectrum is close to the heave, roll, and pitch natural frequencies of the platform.
UR - http://www.scopus.com/inward/record.url?scp=77953108377&partnerID=8YFLogxK
U2 - 10.1115/OMAE2009-79163
DO - 10.1115/OMAE2009-79163
M3 - Conference paper
AN - SCOPUS:77953108377
SN - 9780791843468
T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
SP - 355
EP - 363
BT - Proceedings of the 28th International Conference on Ocean, Offshore and Arctic Engineering 2009, OMAE2009
T2 - 28th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2009
Y2 - 31 May 2009 through 5 June 2009
ER -