Design wave method for the extreme horizontal slow-drift motion of moored floating platforms

2018 ◽  
Vol 71 ◽  
pp. 48-58 ◽  
Author(s):  
Dong-Hyun Lim ◽  
Yonghwan Kim
Keyword(s):  
Wave Method ◽  
Drift Motion ◽  
Slow Drift ◽  
Floating Platforms ◽  
Slow Drift Motion

Design Wave Analysis for the Extreme Horizontal Slow-Drift Motion of Moored Floating Platforms

2018 ◽  
Author(s):  
Dong-Hyun Lim ◽  
Yonghwan Kim
Keyword(s):  
Volterra Series ◽  
Offshore Structures ◽  
Wave Analysis ◽  
Drift Motion ◽  
Slow Drift ◽  
Extreme Response ◽  
Response Profile ◽  
Floating Platforms ◽  
Fully Coupled ◽  
Slow Drift Motion

In this study, a new design wave analysis method for estimating the extreme slow-drift motion of floating offshore structures is introduced. Here, the design wave refers to the irregular incident wave of short duration that induces the extreme response of desired return period. The present method is composed of following four steps: linearization of the dynamic system, probabilistic analysis of the Volterra series, generation of the design waves, and the fully-coupled nonlinear time-domain simulations. In generating the design waves, the conditioning of the most likely extreme response profile is suggested. The method was applied to a deep-water semi-submersible platform, and the results appeared to be promising compared to the full-length nonlinear simulations.

Nonlinear mooring line induced slow drift motion of an ALP-tanker

1993 ◽  
Vol 20 (3) ◽  
pp. 233-246 ◽  
Author(s):  
H.S. Choi ◽  
J.Y.K. Lou
Keyword(s):  
Mooring Line ◽  
Drift Motion ◽  
Slow Drift ◽  
Slow Drift Motion

Assessing the Importance of the Slow Drift Motion of Floating Wind Turbine Platforms

2014 ◽  
Author(s):  
Richard C. Lupton ◽  
Robin S. Langley
Keyword(s):  
Wind Turbines ◽  
Diffraction Theory ◽  
Second Order ◽  
Offshore Wind ◽  
Offshore Platforms ◽  
Floating Structures ◽  
Drift Motion ◽  
Offshore Wind Turbines ◽  
Slow Drift ◽  
Slow Drift Motion

As offshore wind turbines are installed in deeper water, interest is growing in floating wind turbines because, among other reasons, they may become cheaper than fixed-bottom turbines at greater depths. When analysing floating wind turbines, linear diffraction theory is commonly used to model the hydrodynamic loads on the platform. While it well known that slow drift motion due to second-order loads can be important for other floating offshore platforms, it has not yet been established how important such effects are for floating wind turbines. In this paper we aim to give a general result by developing approximate closed-form expressions to estimate the second-order slow drift motion of platforms of different sizes. The values are bench-marked against a typical calculation of the slow-drift response of a platform. The results show that floating wind turbines, which tend to have smaller dimensions than other floating structures, may be expected to show smaller slow-drift motions.

scholarly journals Time Domain Simulation of Slow Drift Motion of a Floating Structure in Waves

1989 ◽  
Vol 1989 (166) ◽  
pp. 151-162
Author(s):  
Takeshi Kinoshita ◽  
Kazuhito Takaiwa ◽  
Takahiro Murakami ◽  
Koichi Masuda
Keyword(s):  
Time Domain ◽  
Time Domain Simulation ◽  
Floating Structure ◽  
Drift Motion ◽  
Slow Drift ◽  
Slow Drift Motion
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