Concept design of jacket foundations for offshore wind turbines in 10 steps

Jalbi, Saleh; Bhattacharya, Subhamoy

doi:10.1016/j.soildyn.2020.106357

Cited by 25 publications

(4 citation statements)

References 62 publications

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“…To evaluate this influence, the flexibility coefficient C J is introduced, which represents the following relationship where f f b is the target design frequency of the fixed based tower-jacket system without piles. C J is calculated with a series of empirical formulas as introduce in [15].…”

Section: The Influence Of the Piles On The Natural Frequencies Of The...mentioning

confidence: 99%

“…where EI T −J is the bending stiffness of the tower-jacket system, h total is the total height of the tower-jacket system, L bottom is the jacket leg bottom spacing, α is the foundation stiffness variability factor taken as 1, k v is the vertical stiffness of the foundation, G s is the average of the sandy soil shear modulus between the top and bottom of the pile, which is taken as 30 MPa according to Fig. 17 in [15] corresponding to a soil depth of 30m, L p is the length of the pile taken as 60 m, ζ is the damping ratio relative to critical damping taken as 4. Based on the current design, EI T −J can be estimated according to the main dimensions and target frequency of the jacket-tower system as:…”

Section: The Influence Of the Piles On The Natural Frequencies Of The...mentioning

confidence: 99%

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Pile design for X-rotor offshore wind turbine

Dong,

Silva,

Muskulus

2023

J. Phys.: Conf. Ser.

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For the foundations of traditional offshore structures in oil and gas industry, the dominant load is in vertical direction. For wind turbines, especially for vertical axis wind turbines, the lateral loads are increased significantly, which makes them the key element of the pile design. The X-rotor offshore wind turbine is a novel concept which is a hybrid of vertical and horizontal axis wind turbines. This paper aims at giving a detailed solution for the pile design of X-rotor type offshore wind turbines based on the existing guidelines and to gain an insight in the influences of the cyclic loads on the pile parameter selection. The pile capacity design and the pile performance design are executed and then the influence of the piles to the natural frequencies of the wind turbine is evaluated.

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Section: The Influence Of the Piles On The Natural Frequencies Of The...mentioning

confidence: 99%

Section: The Influence Of the Piles On The Natural Frequencies Of The...mentioning

confidence: 99%

Pile design for X-rotor offshore wind turbine

Dong,

Silva,

Muskulus

2023

J. Phys.: Conf. Ser.

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“…It has a lower level of wave loads than other bottom-mounted foundations [45]. The cost of construction and installation is relatively high [46]. Some examples of offshore wind farms that employ this substructure are Ormonde (150 MW) and Moray East (950 MW) of UK.…”

Section: Bottom-mounted Foundationmentioning

confidence: 99%

A state-of-the-art review of the hybrid wind-wave energy converter

Dong

et al. 2022

Prog. Energy

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The urgent demand for energy structural reform and the limitations of single energy development have promoted the combination of wind energy and wave energy. A hybrid energy system means that two or more energy devices share the same foundation. It reduces the levelized cost of energy (LCOE) and improves competitiveness through infrastructure sharing and increased power output. This paper starts with the development of the joint resources of wind and wave energies, then introduces the foundation forms of the hybrid system. It reviews the latest concepts and devices proposed with the integration of wind energy and wave energy, according to the foundation forms, and makes a preliminary assessment of the synergies of the hybrid system. The existing study methods of the hybrid systems are summarized. In view of the challenges faced by the development of hybrid energy systems, several suggestions are put forward accordingly. This paper provides a comprehensive guideline for the future development of the hybrid wind-wave energy converter (W-WEC) system.

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“…Currently, the fixed offshore wind turbine is the main form of offshore wind turbines globally, with monopile foundations and jacket foundations being the most common foundation types [2,3]. Fixed wind turbines obtain soil bearing capacity by embedding the foundation structure into the seabed to resist the wind, wave, and current loads on the wind turbines [4]. In recent decades, many scholars have conducted research on the dynamic characteristics of offshore wind turbines under the effects of wind, waves, currents, earthquakes, and other loads [5][6][7], resulting in a relatively mature research foundation in this field.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Analysis of a Multi-Pile-Supported Offshore Wind Turbine Integrated with an Aquaculture Cage

Tu,

Zhang,

Liu

et al. 2023

JMSE

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The integrated development of offshore wind power and marine aquaculture is becoming increasingly important. However, the impact mechanism of integrating a net cage on the dynamic characteristics of offshore wind turbines remains unclear. This paper presents a design scheme for a multi-pile-supported offshore wind turbine integrated with an aquaculture net cage and conducts a preliminary theoretical analysis of the influence of an additional net cage on the wind turbine. The analysis reveals that the primary effect is an increase in hydrodynamic loads on the wind turbine foundation, while the structural frequency of the wind turbine remains largely unaffected. Furthermore, computational fluid dynamics (CFD) numerical models, whose accuracy is verified by physical experiments, are utilized to compare the hydrodynamic characteristics of the offshore wind turbine foundation with and without the net cage, considering different net solidities. The simulations identify significant changes in the flow field surrounding the foundation due to the presence of the net cage, resulting in a considerable increase in the overall hydrodynamic load on the foundation. Moreover, the mutual interference between the netting and the foundation amplifies their respective hydrodynamic loads and concentrates these loads at the upstream section of the structure. The maximum increase in hydrodynamic load for a single pile reaches 6.32 times its original value, posing significant risks to the structure. Finally, a preliminary feasibility analysis of the scheme was conducted. The results presented in this article can serve as a theoretical basis for the design of such innovative structures.

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Concept design of jacket foundations for offshore wind turbines in 10 steps

Cited by 25 publications

References 62 publications

Pile design for X-rotor offshore wind turbine

Pile design for X-rotor offshore wind turbine

A state-of-the-art review of the hybrid wind-wave energy converter

Hydrodynamic Analysis of a Multi-Pile-Supported Offshore Wind Turbine Integrated with an Aquaculture Cage

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