Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure

Wu, Hai-lang; Chen, Xujun; Huang, Yaxin; Wang, Bing

doi:10.1080/17445302.2013.867646

Cited by 11 publications

(3 citation statements)

References 23 publications

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“…Jack-up barges typically have four legs, significantly differ in size, and are not self-propelled, for example, the Sea Jack manufactured by A2SEA. Another type of installation vessel with 4-6 legs can self-propel and travel at 8-12 knots [13,14]. When the vessel arrives at the work location, it can complete the exact placement all by itself owing to the tandem between the positioning system and the propeller.…”

Section: Steps and Methods Of Jack-up Vessel Installationmentioning

confidence: 99%

Penetration Behavior of the Footing of Jack-Up Vessel of OWTs in Thin Stiff over NC Clay

et al. 2022

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This study investigated the behavior of the spudcan foundation of jack-up vessels of offshore wind turbines during the undrained vertical penetration into thin stiff-over-normally consolidated clay. Large deformation finite element (LDFE) analyses were used to simulate the continuous spudcan penetration into the seabed surface. Detailed parametric analysis was performed to explore a range of normalized soil properties and layer geometry and roughness of the soil–spudcan interface. The results were validated against previously reported data. The LDFE results were consistent with those of centrifuge tests. The evolving soil-failure patterns revealed soil backflow and the trapping of stronger top-layer material beneath the spudcan. The plug shape was influenced by the top layer thickness, the strength gradient of the bottom layer, and the relative strength ratio, which also affected the penetration resistance of soils. In this study, an expression was derived to quantify the plug shape with the aim of providing a theoretical basis for the design of spudcan footings with penetration resistance suitable for thin stiff-over-soft clay.

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Section: Steps and Methods Of Jack-up Vessel Installationmentioning

confidence: 99%

Penetration Behavior of the Footing of Jack-Up Vessel of OWTs in Thin Stiff over NC Clay

et al. 2022

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“…Tabeshpour et al (2006Tabeshpour et al ( , 2013 carried out a hydrodynamic analysis of the damped pitch and heave motion of TLPs and presented exact solutions for the vibration of a TLP interacting with ocean waves. Wu et al (2014) investigated the influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure. The authors also numerically simulated the hydrodynamic responses of the structure in different scenarios by applying the three-dimensional potential theory.…”

Section: Introductionmentioning

confidence: 99%

Investigation of pitch motion portion in vertical response at sides of a Tension-Leg Platform

Tabeshpour

Malayjerdi

2016

J. Marine. Sci. Appl.

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Tendons vertically moor Tension-Leg Platforms (TLPs), thus, a deep understanding of physical tendon stresses requires the determination of the total axial deformation of the tendons, which is a combination of the heave, pitch, and surging responses. The vertical motion of the lateral sides of the TLP is coupled with surge and constitutes a portion of the pitch motion. Tendons are connected to the sides of the TLP; hence, the total displacement of the lateral sides is related to the total deformation of the tendons and the total axial stress. Therefore, investigating the total vertical response at the sides of the TLP is essential. The coupling between various degrees of freedom is not considered in the Response Amplitude Operator (RAO). Therefore, in frequency domain analysis, the estimated vertical RAO is incomplete. Also, in the time domain, only the heave motion at the center of TLP is typically studied; this problem needs to be addressed. In this paper, we investigate the portion of the pitch motion in the vertical response at the sides of the TLP in both the frequency and time domains. Numerical results demonstrate a significant effect of the pitch motion in the vertical motion of the edges of the TLP in some period ranges.

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“…Tajali and Shafieefar (2011) carried out the hydrodynamic motions of a FP interacting with incident waves by a hydrodynamic procedure using the 3D diffraction theory. Wu et al (2014) analysed the influence of the legs underwater on the hydrodynamic responses by applying the 3D potential theory. Bhattacharjee and Soares (2011) investigated the 3D case of oblique wave interaction with a floating pontoon near a wall with stepped bottom, in which the effects of water depth ratios, dimension of the structure and other factors on the wave-induced forces on the structures and wave propagation characteristics were discussed.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of a moored pontoon under regular wave in water of finite depth

Chen

Miao

Tang

et al. 2016

Ships and Offshore Structures

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KEYWORDSOffshore structure; hydrodynamic analysis; moored pontoon; physical model tests; finite water depthThe hydrodynamic analysis of pontoon-type floating structure interacting with waves is very important in offshore engineering. In this paper, both numerical and physical model tests have been carried out to investigate the hydrodynamic performances of a moored pontoon in finite depth water. The experiments were conducted with many cases with various wave periods under regular wave in a wave tank. Numerical simulations were carried out in the several conditions. The numerical results were compared with the consequences of the model tests. It is showed that the numerical results are in agreement with the model tests in majority cases, particularly, the change tendency of curves is essentially same in two ways. The motion responses of the floating pontoon, as well as the chain forces in different wave heights and wave angles were calculated with a wide range of wave periods by the numerical method to find out the influences of the wave parameters on the hydrodynamic properties of the moored barge. Based on the numerical and experimental results, some useful conclusions have been drawn in this paper.

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Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure

Cited by 11 publications

References 23 publications

Penetration Behavior of the Footing of Jack-Up Vessel of OWTs in Thin Stiff over NC Clay

Penetration Behavior of the Footing of Jack-Up Vessel of OWTs in Thin Stiff over NC Clay

Investigation of pitch motion portion in vertical response at sides of a Tension-Leg Platform

Numerical and experimental analysis of a moored pontoon under regular wave in water of finite depth

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