Feasibility study of offshore wind turbines with hybrid monopile foundation based on centrifuge modeling

Wang, Xuefei; Zeng, Xin; Yang, Xu; Li, Jiale

doi:10.1016/j.apenergy.2017.10.107

Cited by 93 publications

(27 citation statements)

References 38 publications

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“…Located in such a dynamic and extremely powerful element as the sea is, foundations become one of the main elements of these projects, receiving over one-third of the total cost [29][30][31][32]. As they must support the wind turbines, absorbing all the forces and loads and providing a safe and stable base, defining the right typology of foundation can have a huge impact both on the economic and technical sides, becoming especially vital these last years as wind farms are being located further from the coast, and every element must be designed and optimized in detail, to avoid performance problems and reduce maintenance works.…”

Section: Typologies Of Foundationsmentioning

confidence: 99%

Foundations in Offshore Wind Farms: Evolution, Characteristics and Range of Use. Analysis of Main Dimensional Parameters in Monopile Foundations

Avila-Sanchez

Gutiérrez

Negro

et al. 2019

JMSE

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Renewable energies are the future, and offshore wind is undoubtedly one of the renewable energy sources for the future. Foundations of offshore wind turbines are essential for its right development. There are several types: monopiles, gravity-based structures, jackets, tripods, floating support, etc., being the first ones that are most used up to now. This manuscript begins with a review of the offshore wind power installed around the world and the exposition of the different types of foundations in the industry. For that, a database has been created, and all the data are being processed to be exposed in clear graphic summarizing the current use of the different foundation types, considering mainly distance to the coast and water depth. Later, the paper includes an analysis of the evolution and parameters of the design of monopiles, including wind turbine and monopile characteristics. Some monomials are considered in this specific analysis and also the soil type. So, a general view of the current state of monopile foundations is achieved, based on a database with the offshore wind farms in operation.

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Section: Typologies Of Foundationsmentioning

confidence: 99%

Foundations in Offshore Wind Farms: Evolution, Characteristics and Range of Use. Analysis of Main Dimensional Parameters in Monopile Foundations

Avila-Sanchez

Gutiérrez

Negro

et al. 2019

JMSE

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show abstract

“…A circular cylinder in moderate water depth is selected as the second testing case for validation, since it is an essential component (e.g., buoyancy column of the floater) of the offshore renewable energy devices (see e.g. [55], [56] and [57]). Firstly, a grid test is performed to ensure the convergence of the numerical results.…”

Section: Case No2: a Floating Circular Cylindrical Columnmentioning

confidence: 99%

A reliable open-source package for performance evaluation of floating renewable energy systems in coastal and offshore regions

Liu

Yoshida

et al. 2018

Energy Conversion and Management

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The booming developments of coastal/offshore renewable energies in recent years call for a powerful numerical code, ideally open-source packaged, to accelerate the researches in the spotlight. This paper presents such an efficient software package for evaluating the performance of floating renewable energy systems in the coastal and offshore regions. It aims to contribute an open-source effort in numerical simulations for ocean energy converters. Though computation of the freesurface effect in moderate depth region is extremely troublesome due to the singularities, the software package proposed in the present paper gives a satisfactory solution to keep the balance of accuracy and efficiency. In the present paper, the interface and structure of the package are introduced in detail so as to be well understood by the reader. Benchmark tests for various types of converters have confirmed the accuracy and efficiency of the package which can be incorporated easily with a frequency domain solver for efficient analysis. By contributing as one of the pioneer works in the opensource effort of evaluating the moderate-depth free-surface Green's function, with its advantages of a reliable accuracy and a relatively low cost, the authors are hoping that the publication of the present software package will promote the continuous researches in developing robust and reliable coastal and offshore renewable energy systems.

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“…However, very few studies have been conducted on tripod foundations, which have different mechanisms compared to conventional foundations (i.e., monopile and monopods). In addition, design guidelines for tripod foundations have not been established [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Modeling for the Evaluation of the Cyclic Behavior of Offshore Wind Turbine with Tripod Foundation

2021

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In this study, the cyclic responses of an offshore wind turbine with a tripod foundation installed on an actual site were evaluated in a centrifuge. To understand the behavior of the turbine at the site, the site soil conditions, environmental loads, and real offshore wind turbine structure installed at the actual site were modeled by considering the centrifuge scaling law. From a series of cyclic loading tests, the cyclic responses of the tripod foundation were evaluated in terms of temporary/permanent displacements and cyclic stiffness. Moreover, the long-term behavior of the tripod foundation was predicted from the experimental results. The test results showed that the initial stiffness of the soil–foundation system decreased as the loading amplitude increased and that the stiffness increased with the number of cycles due to soil densification. The findings revealed that the cyclic behaviors of the tripod were more affected by the load amplitude than the number of cycles. In addition, the permanent rotation increased logarithmically with the number of cycles. A simple method to predict the displacement and change in the foundation stiffness of the actual wind turbine is proposed based on the results of the model tests. The results of this study also provide key insights into the long-term cyclic behavior of tripod foundations for offshore wind turbines.

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Feasibility study of offshore wind turbines with hybrid monopile foundation based on centrifuge modeling

Cited by 93 publications

References 38 publications

Foundations in Offshore Wind Farms: Evolution, Characteristics and Range of Use. Analysis of Main Dimensional Parameters in Monopile Foundations

Foundations in Offshore Wind Farms: Evolution, Characteristics and Range of Use. Analysis of Main Dimensional Parameters in Monopile Foundations

A reliable open-source package for performance evaluation of floating renewable energy systems in coastal and offshore regions

Centrifuge Modeling for the Evaluation of the Cyclic Behavior of Offshore Wind Turbine with Tripod Foundation

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