A comparison of methods for calculating the motion of a semi-submersible

Takagi, Matao; Arai, Shinichi; Takezawa, Seiji; Tanaka, Kunio; Takarada, Naonosuke

doi:10.1016/0029-8018(85)90010-1

Cited by 20 publications

(10 citation statements)

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“…In this sense, we have observed that the behavior of the methods up to 1200 s is representative of the overall response with longer simulation times. That is, any degradation (due for instance to an inappropriate consideration of (Takagi et al, 1985). the nonlinear effects) shows up early in the response, as will be seen in some of the following results.…”

Section: Analysis Strategiesmentioning

confidence: 80%

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A reduced integration method for the coupled analysis of floating production systems

et al. 2015

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Section: Analysis Strategiesmentioning

confidence: 80%

“…Ocean Engineering Committee to compare results of numerical methods with experimental results from tank tests (Takezawa et al, 1984;Takagi et al, 1985). Fig.…”

Section: Description Of the Modelmentioning

confidence: 99%

A reduced integration method for the coupled analysis of floating production systems

et al. 2015

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“…The subjects include hydrodynamic loads and effects, high order nonlinear response, coupled hull/mooring line/riser systems, and model tests. Takagi and Arai (1985), and Clauss et al (1996) studied the hydrodynamics and optimization approach for conventional Semi and novel Semi platforms. Thiagarajan et al (1998), Bhattacharyya et al (2003), Chen et al (2006), and Low (2010) focused on the nonlinear motion and the hydrodynamics of TLP.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic comparison of a semi-submersible, TLP, and Spar: Numerical study in the South China Sea environment

Liu

Yan

et al. 2011

J. Marine. Sci. Appl.

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The South China Sea contains tremendous oil and gas resources in deepwater areas. However, one of the keys for deepwater exploration, the investigation of deepwater floating platforms, is very inadequate. In this paper, the authors studied and compared the hydrodynamics and global motion behaviors of typical deepwater platforms in the South China Sea environment. The hydrodynamic models of three main types of floating platforms, e.g. the Semi-submersible, tension leg platform (TLP), and Truss Spar, which could potentially be utilized in the South China Sea, were established by using the 3-D potential theory. Additionally, some important considerations which significantly influence the hydrodynamics were given. The RAOs in frequency domains as well as global motions in time domains under time-varying wind, random waves, and current in 100-y, 10-y, and 1-y return period environment conditions were predicted, compared, and analyzed. The results indicate that the heave and especially the pitch motion of the TLP are favorable. The heave response of the Truss Spar is perfect and comparable with that of the TLP when the peak period of random waves is low. However, the pitch motion of Truss Spar is extraordinarily larger than that of Semi-submersible and TLP.

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“…A mesma referência [13] apresenta alguns resultados das comparações dos métodos citados. A referência [11] , no entanto, publicada um ano após, apresenta resultados (na escala do modelo 1:64) mais detalhados a respeito desta comparação e, portanto, serve de base para a apresentação que se segue.…”

Section: Resultados Numéricosunclassified

“…Outro conjunto de resultados apresentados na referência [11] diz respeito à compilação de diversos experimentos com a plataforma ITTC-SR192 em escala 1:64, ver Figura 17.…”

Section: Resultados Experimentaisunclassified

Confrontação numérico-experimental da dinâmica de sistema flutuante, considerando seu acoplamento com linhas de produção.

Rateiro¹

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This research aims to present analysis and comparisons, intended to make part of the constant improvement of the oil platform analysis software, called Numerical Offshore Tank (Tanque de Provas Numérico -TPN).For this purpose, small-scale model tests were performed, and the results compared with the numerical model in TPN. The standard unit used in these model tests was the semisubmersible ITTC-SR192, at scale 1:105, and the tests were performed at IPT (State of São Paulo Institute for Technological Research) towing tank.By means of the model tests results comparisons, the ability of the TPN in reproduce the hull motions, the risers top tensions and damping induced by these lines was evaluated.Importantly, these parameters were verified with the further purpose of comparing the numerical and the experimental results, focusing on the influence of the production lines in the dynamics of the floating system. Taking into account this additional objective, all the model tests were performed with and without production lines, i.e. risers, modeled as a group of highly flexible and large diameter structures, in order to provide a significant increment in the damping of the system. Thus, the dynamic behaviors of the cases with and without risers were compared, giving means to observe motion differences in waves and current. Moreover, using the method recommend by API, reference [3] , hereinafter called "Near and Far", the top tension of one riser was numerically simulated with the imposition of the motions obtained in the experiments, giving means to compare the riser design criteria, considering the influence of lines attached to the oil platforms.

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A comparison of methods for calculating the motion of a semi-submersible

Cited by 20 publications

References 0 publications

A reduced integration method for the coupled analysis of floating production systems

A reduced integration method for the coupled analysis of floating production systems

Hydrodynamic comparison of a semi-submersible, TLP, and Spar: Numerical study in the South China Sea environment

Confrontação numérico-experimental da dinâmica de sistema flutuante, considerando seu acoplamento com linhas de produção.

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