Effect of Uncertainty on Slow Drift Motion of TLP

2020 ◽  
pp. 53-64
Author(s):  
Vini Anna Varghese ◽  
Nilanjan Saha
Keyword(s):  
Drift Motion ◽  
Slow Drift ◽  
Slow Drift Motion

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

Experimental and Numerical Study of the Slow-Drift Motion of a Rectangular Barge Moored at an Inclined Beach

2010 ◽  
Author(s):  
Bernard Molin ◽  
Fabien Remy ◽  
Yanan Liu ◽  
Marie-Christine Rouault
Keyword(s):  
Numerical Study ◽  
Scale Model ◽  
Sea State ◽  
Flat Bottom ◽  
Drift Motion ◽  
Beam Seas ◽  
Slow Drift ◽  
Irregular Beam Seas ◽  
Sway Motion ◽  
Slow Drift Motion

An experimental campaign is reported on the slow-drift motion of a rectangular barge moored in irregular beam seas. The 24 m long false bottom of the basin is raised and inclined at a slope of 5%, from 1.05 m below the free surface to 0.15 m above. The barge is moored successively at 4 different locations, in water-depths ranging from 54 to 21 cm. The measured slow-drift component of the sway motion is compared with state-of-the-art calculations based on Newman approximation. At 54 cm depth good agreement is obtained between calculations and measurements. At 21 cm depth the Newman calculation exceeds the measured value. When the flat bottom setdown contribution is added up, the calculated value is 2 to 3 times larger than the measured one. A second-order model is proposed to account for the shoaling of a bichromatic sea-state propagating in decreasing water-depth. Application of this numerical model to the scale-model tests shows that in shoaling conditions the setdown contribution to the slow-drift excitation can counteract and not necessarily add up to the Newman component.

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