Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.4
2.7
Journals
JMSE
Special Issues
Analysis and Design of Offshore Wind Turbine Support Structures
share announcement

Analysis and Design of Offshore Wind Turbine Support Structures

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (15 April 2021) | Viewed by 39995

Special Issue Editors

Prof. Dr. Ki-Du Kim

E-Mail Website
Guest Editor
Department of Civil and Environmental Engineering, Konkuk University, Seoul 05029, Republic of Korea
Interests: fixed/floating offshore structures; development of offshore structural analysis program (X-SEA); development of CAD-embedded pre/post processor
Special Issues, Collections and Topics in MDPI journals
Dr. Pasin PlotPradit

E-Mail Website
Section Board Member
Department of Civil and Environmental Engineering, Konkuk University, Seoul, Korea
Interests: offshore wind turbine; coupled offshore structural dynamic analysis; finite element analysis; OpenFAST analysis; pile–soil structure interaction

Special Issue Information

Dear Colleagues,

Offshore wind farms have been developed and commercialized through pilot projects since 1990. Support structures of offshore wind turbines have highly dynamic behaviours, combining wind and hydrodynamic loading and complex dynamic behaviour from the wind turbine. It is important to capture the coupled effect of the wind and wave loads and the wind turbine system. The current Special Issue will focus on the analysis and design of support structures incorporating all turbine loads as well as the offshore environmental loads and soil. All theoretical, numerical, and experimental methods can be published for the proper design of support structure on topics based on the keywords. Furthermore, an overview of the different types of structures and how they are fabricated and installed could be published as part of this Special Issue.

Prof. Dr. Ki-Du Kim
Dr. Pasin PlotPradit
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • fixed and floating offshore wind turbine structures
  • steel and concrete structures
  • analysis of wind turbine load
  • analysis of offshore structures
  • fatigue analysis of joints
  • pile–soil interaction analysis
  • offshore wave engineering
  • mooring analysis of floating structure
  • numerical and experimental methods
  • installation of offshore wind turbine support structures
  • cost analysis of energy for offshore wind farms

Benefits of Publishing in a Special Issue

  • Ease of navigation: Grouping papers by topic helps scholars navigate broad scope journals more efficiently.
  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • e-Book format: Special Issues with more than 10 articles can be published as dedicated e-books, ensuring wide and rapid dissemination.

Further information on MDPI's Special Issue polices can be found here.

Published Papers (8 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

13 pages, 7592 KiB  
Article
The Effect of the Second-Order Wave Loads on Drift Motion of a Semi-Submersible Floating Offshore Wind Turbine
by Thanh-Dam Pham and Hyunkyoung Shin
J. Mar. Sci. Eng. 2020, 8(11), 859; https://doi.org/10.3390/jmse8110859 - 30 Oct 2020
Cited by 12 | Viewed by 4791
Abstract
Floating offshore wind turbines (FOWTs) have been installed in Europe and Japan with relatively modern technology. The installation of floating wind farms in deep water is recommended because the wind speed is stronger and more stable. The design of the FOWT must ensure [...] Read more.
Floating offshore wind turbines (FOWTs) have been installed in Europe and Japan with relatively modern technology. The installation of floating wind farms in deep water is recommended because the wind speed is stronger and more stable. The design of the FOWT must ensure it is able to withstand complex environmental conditions including wind, wave, current, and performance of the wind turbine. It needs simulation tools with fully integrated hydrodynamic-servo-elastic modeling capabilities for the floating offshore wind turbines. Most of the numerical simulation approaches consider only first-order hydrodynamic loads; however, the second-order hydrodynamic loads have an effect on a floating platform which is moored by a catenary mooring system. At the difference-frequencies of the incident wave components, the drift motion of a FOWT system is able to have large oscillation around its natural frequency. This paper presents the effects of second-order wave loads to the drift motion of a semi-submersible type. This work also aimed to validate the hydrodynamic model of Ulsan University (UOU) in-house codes through numerical simulations and model tests. The NREL FAST code was used for the fully coupled simulation, and in-house codes of UOU generates hydrodynamic coefficients as the input for the FAST code. The model test was performed in the water tank of UOU. Full article
(This article belongs to the Special Issue Analysis and Design of Offshore Wind Turbine Support Structures)
►▼ Show Figures

Figure 1

25 pages, 9636 KiB  
Article
Simplified Numerical Models to Simulate Hollow Monopile Wind Turbine Foundations
by Susana Lopez-Querol, Michail Spyridis, Pedro J. M. Moreta and Juana Arias-Trujillo
J. Mar. Sci. Eng. 2020, 8(11), 837; https://doi.org/10.3390/jmse8110837 - 24 Oct 2020
Cited by 4 | Viewed by 3315
Abstract
The majority of wind turbine foundations consist of hollow monopiles inserted in the soil, requiring high computational effort to be numerically simulated. Alternative simplified models are very often employed instead. Three-dimensional solid models, in which the hollow structure and pile are substituted by [...] Read more.
The majority of wind turbine foundations consist of hollow monopiles inserted in the soil, requiring high computational effort to be numerically simulated. Alternative simplified models are very often employed instead. Three-dimensional solid models, in which the hollow structure and pile are substituted by solid cylinders with equivalent properties, are the most extended simplifications. Very few 2D models can be found in the literature due to the challenge of finding suitable equivalent properties and loads to fully represent the 3D nature of the problem. So far, very limited attention has been devoted to the accuracy of both 3D and 2D simplified models under dynamic and even static actions. Thus, in this paper, simplified 3D and 2D solid models are proposed and justified. An elasto-plastic constitutive model with accumulative degradation is used to simulate the soil behaviour, and frictional contact elements are implemented between the soil and pile to model their interaction. These simplified approaches are compared with the full 3D hollow model, under static and cyclic loads. The results demonstrate that the proposed simplified approaches are a reasonable alternative to the 3D hollow model, which allows researchers and designers to drastically reduce the computational effort in the simulations under long term conditions. Full article
(This article belongs to the Special Issue Analysis and Design of Offshore Wind Turbine Support Structures)
►▼ Show Figures

Figure 1

26 pages, 3996 KiB  
Article
Platform Optimization and Cost Analysis in a Floating Offshore Wind Farm
by Alberto Ghigo, Lorenzo Cottura, Riccardo Caradonna, Giovanni Bracco and Giuliana Mattiazzo
J. Mar. Sci. Eng. 2020, 8(11), 835; https://doi.org/10.3390/jmse8110835 - 23 Oct 2020
Cited by 69 | Viewed by 11232
Abstract
Floating offshore wind represents a new frontier of renewable energies. The absence of a fixed structure allows exploiting wind potential in deep seas, like the Atlantic Ocean and Mediterranean Sea, characterized by high availability and wind potential. However, a floating offshore wind system, [...] Read more.
Floating offshore wind represents a new frontier of renewable energies. The absence of a fixed structure allows exploiting wind potential in deep seas, like the Atlantic Ocean and Mediterranean Sea, characterized by high availability and wind potential. However, a floating offshore wind system, which includes an offshore turbine, floating platform, moorings, anchors, and electrical system, requires very high capital investments: one of the most relevant cost items is the floating substructure. This work focuses on the choice of a floating platform that minimizes the global weight, in order to reduce the material cost, but ensuring buoyancy and static stability. Subsequently, the optimized platform is used to define a wind farm located near the island of Pantelleria, Italy in order to meet the island’s electricity needs. A sensitivity analysis to estimate the Levelized Cost Of Energy is presented, analyzing the parameters that influence it most, like Capacity Factor, Weighted Average Capital Cost (WACC) and number of wind turbines. Full article
(This article belongs to the Special Issue Analysis and Design of Offshore Wind Turbine Support Structures)
►▼ Show Figures

Figure 1

24 pages, 5978 KiB  
Article
Improving the Computational Efficiency for Optimization of Offshore Wind Turbine Jacket Substructure by Hybrid Algorithms
by Ding-Peng Liu, Tsung-Yueh Lin and Hsin-Haou Huang
J. Mar. Sci. Eng. 2020, 8(8), 548; https://doi.org/10.3390/jmse8080548 - 22 Jul 2020
Cited by 2 | Viewed by 2949
Abstract
When solving real-world problems with complex simulations, utilizing stochastic algorithms integrated with a simulation model appears inefficient. In this study, we compare several hybrid algorithms for optimizing an offshore jacket substructure (JSS). Moreover, we propose a novel hybrid algorithm called the divisional model [...] Read more.
When solving real-world problems with complex simulations, utilizing stochastic algorithms integrated with a simulation model appears inefficient. In this study, we compare several hybrid algorithms for optimizing an offshore jacket substructure (JSS). Moreover, we propose a novel hybrid algorithm called the divisional model genetic algorithm (DMGA) to improve efficiency. By adding different methods, namely particle swarm optimization (PSO), pattern search (PS) and targeted mutation (TM) in three subpopulations to become “divisions,” each division has unique functionalities. With the collaboration of these three divisions, this method is considerably more efficient in solving multiple benchmark problems compared with other hybrid algorithms. These results reveal the superiority of DMGA in solving structural optimization problems. Full article
(This article belongs to the Special Issue Analysis and Design of Offshore Wind Turbine Support Structures)
►▼ Show Figures

Figure 1

9 pages, 4249 KiB  
Article
Model Test and Numerical Simulation of Grouted Connections for Offshore Wind Turbine Under Static Axial Load
by Weiqiu Zhong, Wuxu Li, Tao Yang, Deming Liu and Lintao Li
J. Mar. Sci. Eng. 2020, 8(7), 543; https://doi.org/10.3390/jmse8070543 - 21 Jul 2020
Viewed by 2355
Abstract
The bearing capacity of the grouted connections is investigated through the model test and numerical simulation with two rates (low and high) and four kinds of specimens: shorter without shear keys, shorter with shear keys, longer with shear keys, and conical with shear [...] Read more.
The bearing capacity of the grouted connections is investigated through the model test and numerical simulation with two rates (low and high) and four kinds of specimens: shorter without shear keys, shorter with shear keys, longer with shear keys, and conical with shear keys. It reveals that the bearing characteristics of the specimen of longer with shear keys is worse than the specimen of conical with shear keys, but better than the specimen of shorter with shear keys. Moreover, the bearing characteristics of the specimen of shorter without shear keys is the worst one. Full article
(This article belongs to the Special Issue Analysis and Design of Offshore Wind Turbine Support Structures)
►▼ Show Figures

Figure 1

14 pages, 2660 KiB  
Article
Analytical Solution for Estimating Bearing Capacity of a Closed Soil Plug: Verification Using An On-Site Static Pile Test
by Suchun Yang, Junwei Liu, Ankit Garg and Mingyi Zhang
J. Mar. Sci. Eng. 2020, 8(7), 490; https://doi.org/10.3390/jmse8070490 - 3 Jul 2020
Cited by 8 | Viewed by 2519
Abstract
When the open-ended pile penetrates the soil layer, the resistance generated by the soil plug cannot be ignored. A pile with a full-size pressure sensor installed at pile tip can detect resistance more accurately than a microsensor when the pile penetrates into the [...] Read more.
When the open-ended pile penetrates the soil layer, the resistance generated by the soil plug cannot be ignored. A pile with a full-size pressure sensor installed at pile tip can detect resistance more accurately than a microsensor when the pile penetrates into the soil. In this paper, the pile installed full-size pressure sensor was used for penetration test and the relationship between formation parameters and pile tip force is obtained. Using the solution of the Kelvin problem in infinite space and the plane stress distribution function, the analytical solution of the bearing capacity of the soil plug is derived under the condition that the displacements of the bottom of the pile and the soil plug are consistent. The results show that the ultimate stress of the soil plug is closely related to the pile diameter and pipe thickness. The bearing capacity of the soil plug is closely related to the properties of the soil layer. The analytical solution of the bearing capacity of the soil plug has a linear relationship with the formation parameters SPT and CPT. The analytical solution of the ultimate bearing capacity of the soil plug has been verified by field test data and has a good match with the geometric dimensions of the pile tip and the formation parameters. Full article
(This article belongs to the Special Issue Analysis and Design of Offshore Wind Turbine Support Structures)
►▼ Show Figures

Figure 1

24 pages, 8098 KiB  
Article
Suction Bucket Pile–Soil–Structure Interactions of Offshore Wind Turbine Jacket Foundations Using Coupled Dynamic Analysis
by Pasin Plodpradit, Osoon Kwon, Van Nguyen Dinh, Jimmy Murphy and Ki-Du Kim
J. Mar. Sci. Eng. 2020, 8(6), 416; https://doi.org/10.3390/jmse8060416 - 8 Jun 2020
Cited by 18 | Viewed by 6813
Abstract
This paper presents a procedure for the coupled dynamic analysis of offshore wind turbine–jacket foundation-suction bucket piles and compares the American Petroleum Institute (API) standard method and Jeanjean’s methods used to model the piles. Nonlinear springs were used to represent soil lateral, axial, [...] Read more.
This paper presents a procedure for the coupled dynamic analysis of offshore wind turbine–jacket foundation-suction bucket piles and compares the American Petroleum Institute (API) standard method and Jeanjean’s methods used to model the piles. Nonlinear springs were used to represent soil lateral, axial, and tip resistances through the P–Y, T–Z, and Q–Z curves obtained by either API’s or Jeanjean’s methods. Rotational springs with a stiffness equated to the tangent or secant modulus characterized soil resistance to acentric loads. The procedure was implemented in X-SEA program. Analyses of a laterally loaded single pile in a soft clay soil performed in both the X-SEA and Structural Analysis Computer System (SACS) programs showed good agreements. The behaviors of a five MW offshore wind turbine system in South Korea were examined by considering waves, current, wind effects, and marine growth. In a free vibration analysis done with soil stiffness through the API method, the piles were found to bend in their first mode and to twist in the second and third modes, whereas the first three modes using Jeanjean’s method were all found to twist. The natural frequencies resulting from Jeanjean’s method were higher than those from the API method. In a forced vibration analysis, the system responses were significantly influenced by soil spring stiffness type. The procedure was found to be computationally expensive due to spring nonlinearities introduced. Full article
(This article belongs to the Special Issue Analysis and Design of Offshore Wind Turbine Support Structures)
►▼ Show Figures

Figure 1

17 pages, 5239 KiB  
Article
Soil Interaction and Grout Behavior for the NREL Reference Monopile Offshore Wind Turbine
by Mário Vieira, Miguel Viana, Elsa Henriques and Luís Reis
J. Mar. Sci. Eng. 2020, 8(4), 298; https://doi.org/10.3390/jmse8040298 - 24 Apr 2020
Cited by 7 | Viewed by 3866
Abstract
Monopiles for offshore wind are the most used foundations by farm operators due to their low production costs, when compared to other bottom-fixed or floating foundations. In this research, a monopile foundation for offshore wind power was evaluated for its soil interaction and [...] Read more.
Monopiles for offshore wind are the most used foundations by farm operators due to their low production costs, when compared to other bottom-fixed or floating foundations. In this research, a monopile foundation for offshore wind power was evaluated for its soil interaction and grout behavior, and an appropriate numerical model for the structural analysis of the foundation and tower was developed. FAST 8, an aero-hydro-servo-elastic numerical code developed by NREL, was used to obtain the loads applied on the supporting structures. These loads were pre-processed before they were inputted on the finite element model, developed using the finite element software ANSYS. The considered conical grout connection, which connects the monopile to the transition piece through friction, was modeled under a changing-status nonlinearity condition. To model the soil–pile interaction, a p-y model was applied using the ANSYS APDL commands. Static, modal, and transient structural analyses were produced to study the structure suitability for its use on offshore environments. Different soil interactions were modeled, and their results were then compared within the transient and modal analysis, indicating that the angle of the grout connection strongly affects the loading conditions on the grout. Moreover, scouring affects the dynamic behavior of the overall supporting structures, thus protection against this phenomenon is suggested. Full article
(This article belongs to the Special Issue Analysis and Design of Offshore Wind Turbine Support Structures)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-8
Back to TopTop