scholarly journals Effects of the Second Order Potential and Coupled Motion of a Slow Drift Motion of a Moored Vessel

1991 ◽  
Vol 1991 (170) ◽  
pp. 299-305 ◽  
Author(s):  
Satoru Takase ◽  
Takeshi Kinoshita ◽  
Tetsuya Matsui
Keyword(s):  
Second Order ◽  
Coupled Motion ◽  
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.

Slow-Drift Motions of a Moored Two-Dimensional Body in Irregular Waves

1989 ◽  
Vol 33 (02) ◽  
pp. 93-106
Author(s):  
Odd M. Faltinsen ◽  
Rong Zhao
Keyword(s):  
Drift Velocity ◽  
Numerical Procedure ◽  
Second Order ◽  
Irregular Waves ◽  
Order Problem ◽  
Drift Motion ◽  
First Order ◽  
Slow Drift ◽  
Weak Points ◽  
Slow Drift Motion

Weak points in the traditional way of analyzing slow-drift motion are discussed. A theory consistent to second order in wave amplitude and first order in slow-drift velocity for the slow-drift motion of a structure is presented. The interaction between the waves and the local quasi-steady flow due to the slow-drift velocity is incorporated. A new numerical procedure to solve the first-and second-order problem is presented. Generalized Haskind relations for the first-order excitation force and the force due to the second-order potential are derived.

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

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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