Response of square tension leg platforms to hydrodynamic forces

Abou-Rayan, Ashraf M.; Seleemah, Ayman; El-Gamal, Amr R.

doi:10.12989/ose.2012.2.2.115

Cited by 7 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For more detailed about the derivation of the stiffness matrix, the reader is referred to [1] The overall stiffness matrix shows: 1) The presence of off-diagonal terms, which reflects the coupling effect between the various degrees of freedom.…”

Section: B Stiffness Matrix Of Triangular Tlp Configurationmentioning

confidence: 99%

“…The force in the surge direction F 11 on the vertical members will cause moment in the pitch degree-of-freedom F 51 . However, forces in the surge degree-of-freedom are symmetrical about the X axis (due to the symmetry of the platform to the approaching wave) and there will be no net moment caused in the yaw degree-of-freedom F 61 For more detailed about the derivation of the force vector, the reader is referred to [1] .…”

Section: Structural Damping [C]mentioning

confidence: 99%

“…Jain [5] dynamic response analysis of a TLP to deterministic first order wave forces is presented, considering coupling between the degrees-of-freedom (surge, sway, heave, roll, pitch and yaw). The analysis considers nonlinearities produced [1] developed a numerical study on determining the dynamic responses of TLPs subjected to regular wave. They found that coupling between various degrees of freedom has insnificantly dependent on the wave height; whereas for longer wave periods of 15 sec.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of water density on the response of Square Tension Leg Platform

El-Gamal¹,

Refat²

2014

The International Conference on Civil and Architecture Engineer

View full text Add to dashboard Cite

tension-leg platform (TLP) or extended tension leg platform (ETLP) is a vertically moored floating structure normally used for the offshore production of oil or gas, and is particularly suited for water depths greater than 300 metres and less than 1500 metres . The platform is permanently moored by means of tethers or tendons grouped at each of the structure's corners. A group of tethers is called a tension leg. A feature of the design of the tethers is that they have relatively high axial stiffness (low elasticity), such that virtually all vertical motion of the platform is eliminated. This allows the platform to have the production wellheads on deck (connected directly to the subsea wells by rigid risers), instead of on the seafloor. This allows a simpler well completion and gives better control over the production from the oil or gas reservoir, and easier access for down hole intervention operations. In this paper a numerical study for a square TLP using modified Morison equation was carried out in the time domain with water particle kinematics using Airy's linear wave theory to investigate the effect of changing water density on the mass matrix of TLP's and the dynamic behavior of TLP's. The effect was investigated for different parameters of the hydrodynamic forces such as wave periods, and wave heights. The numerical study takes into consideration the effect of coupling between various degrees of freedom. The stiffness of the TLP was derived from a combination of hydrostatic restoring forces and restoring forces due to cables. Nonlinear equation was solved using Newmark's beta integration method. Only uni-directional waves in the surge direction was considered in the analysis.

show abstract

Section: B Stiffness Matrix Of Triangular Tlp Configurationmentioning

confidence: 99%

Section: Structural Damping [C]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of water density on the response of Square Tension Leg Platform

El-Gamal¹,

Refat²

2014

The International Conference on Civil and Architecture Engineer

View full text Add to dashboard Cite

show abstract

“…Both studies were conducted to investigate the consequences of nonlinearities generated by hydrodynamic forces in the time domain as well as the conjunction effect between surge, sway, heave, roll, pitch, and yaw degrees of freedom on the dynamic behavior of TLPs. The investigation only considered unidirectional waves in the surge direction, and the responses of the two shapes were compared [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations on the dynamic characteristics of a spar-type offshore wind turbine under irregular waves

Kamal

Abou-Rayan

Shalabe

et al. 2023

Preprint

View full text Add to dashboard Cite

Floating offshore wind turbines (FOWT) in the field of renewable energy are currently a hot research topic. Numerous numerical simulation programs have been developed to model the performance of (FOWT) under combined wave and wind conditions in order to design and optimize them. However, to guarantee accurate results, the numerical methods must be validated. Building a 1/300 scale model with a 3-leg catenary mooring allowed us to assess the performance of the OC3-Hywind spar platform for this study. To simulate real-world conditions, irregular wave states were generated in the Benha Faculty of Engineering Laboratory, where model experiments were carried out. Our findings demonstrate that the model's surge, sway, heave, roll, pitch, and yaw responses were accurately predicted using ANSYS numerical software. Moreover, the numerical software accurately predicted that the sway, roll, and yaw responses were significantly lower than the surge, heave, and yaw responses. These results indicate that numerical simulation software, such as Ansys-Aqwa, can provide precise predictions of the behavior of floating offshore wind turbines under combined wave and wind conditions. The outcomes of our model testing can be used to verify these simulation programs' precision and enhance their prediction capacity.

show abstract

“…Rahim Shoghi, Mohammad Reza Tabeshpour [11], Study the solution for the Duffing equation in a nonlinear vibration problem. A.M.Abou-Rayan, Ayman A. Seleemah, and Amr R. El-gamal [1] developed a numerical study on determining the dynamic responses of TLPs subjected to regular wave. They found that coupling between various degrees of freedom has insignificantly dependent on the wave height; whereas for longer wave periods of 15 sec.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Density of Water on the Dynamic Behavior of Square Tension Leg Platform

Refat

El-Gamal²

2014

AJCEA

View full text Add to dashboard Cite

tension-leg platform (TLP) or extended tension leg platform (ETLP) is a vertically moored floating structure normally used for the offshore production of oil or gas, and is particularly suited for water depths greater than 300 meters and less than 1500 meters. The platform is permanently moored by means of tethers or tendons grouped at each of the structure's corners. A group of tethers is called a tension leg. A feature of the design of the tethers is that they have relatively high axial stiffness (low elasticity), such that virtually all vertical motion of the platform is eliminated. This allows the platform to have the production wellheads on deck (connected directly to the subsea wells by rigid risers), instead of on the seafloor. This allows a simpler well completion and gives better control over the production from the oil or gas reservoir, and easier access for down whole intervention operations. In this paper a numerical study for a square TLP using modified Morison equation was carried out in the time domain with water particle kinematics using Airy's linear wave theory to investigate the effect of changing water density on the mass matrix of TLP's and the dynamic behavior of TLP's. The effect was investigated for different parameters of the hydrodynamic forces such as wave periods, and wave heights. The numerical study takes into consideration the effect of coupling between various degrees of freedom. The stiffness of the TLP was derived from a combination of hydrostatic restoring forces and restoring forces due to cables. Nonlinear equation was solved using Newmark's beta integration method. Only uni-directional waves in the surge direction was considered in the analysis.

show abstract

Response of square tension leg platforms to hydrodynamic forces

Cited by 7 publications

References 6 publications

Effect of water density on the response of Square Tension Leg Platform

Effect of water density on the response of Square Tension Leg Platform

Experimental and numerical investigations on the dynamic characteristics of a spar-type offshore wind turbine under irregular waves

Influence of the Density of Water on the Dynamic Behavior of Square Tension Leg Platform

Contact Info

Product

Resources

About