Review
Engineering, Marine
Baran Yeter, Yordan Garbatov
Summary: This study provides a review of the structural integrity of fixed support structures for offshore wind turbines. It covers the history of fatigue and fracture phenomena, modelling techniques, crack estimation methods, and life prediction models. The study also reviews influential research on structural integrity and reliability, and discusses a risk-based assessment framework.
Article
Green & Sustainable Science & Technology
Yangtian Yan, Yang Yang, Musa Bashir, Chun Li, Jin Wang
Summary: This paper investigates the structural dynamics of 10 MW offshore wind turbines supported by different substructures under various loadings. It reveals that the tripod and jacket have good stability but a higher risk of local failure under earthquakes. The study also suggests that the stiffness of the substructures can improve the stability of the jacket and tripod.
Article
Green & Sustainable Science & Technology
Jharna Pokhrel, Junwon Seo
Summary: This paper develops statistical regression-based models to estimate responses of 5 MW Offshore Wind Turbines subjected to multi-wind-and-wave loads and assesses their fragilities. The key findings show that wind-sensitive blade tip deflection and mudline flexural moment are the main factors causing fragility.
Review
Green & Sustainable Science & Technology
L. Wang, A. Kolios, X. Liu, D. Venetsanos, C. Rui
Summary: This paper presents a state-of-the-art reliability assessment of offshore wind turbine (OWT) support structures, highlighting the importance of considering uncertainties in soil properties and environmental loads. It provides a comprehensive review on structural reliability, reliability-based calibration of codes, fatigue reliability, and the implementation of reliability assessment. The paper also discusses current and future developments in reliability assessment, such as reliability-based design optimization, multi-hazard reliability analysis, and risk-based inspection.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Engineering, Marine
Shunyun Zheng, Chao Li, Yiqing Xiao
Summary: This paper proposes a structural optimization method based on surrogate models to swiftly obtain optimized design schemes of lightweight jackets for offshore wind turbines. Through parameter sensitivity analysis, the key optimization variables of jackets are determined and the genetic algorithm is employed to optimize the surrogate models. The optimized jackets are verified through coupled dynamic analysis, buckling strength and fatigue life checks. The application of surrogate models significantly speeds up the optimization process.
Review
Green & Sustainable Science & Technology
Javier Lopez-Queija, Eider Robles, Josu Jugo, Santiago Alonso-Quesada
Summary: This paper provides a critical review of the current state-of-the-art in floating wind turbine control technologies, discussing the advantages and drawbacks of the most commonly used control algorithms and summarizing future research trends.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Engineering, Marine
Francesco Arcigni, K. A. Abhinav, Maurizio Collu, Mauro Venturini
Summary: This study demonstrates that the thickness and roughness of marine growth significantly impact the loads and dynamic response of wind turbine structures, with changes in marine growth thickness leading to substantial differences in results. The study also shows that tower top displacement increases by 24% when marine growth thickness grows from 0 to 200 mm, while changes in the natural frequencies of the support structure with an increase in marine growth thickness are almost negligible (0.3%).
Article
Computer Science, Interdisciplinary Applications
Xinglei Cheng, Tianju Wang, Jianxin Zhang, Piguang Wang, Wenbo Tu, Wenqian Li
Summary: The safe and stable operation of monopile offshore wind turbines (MOWTs) under seismic and environmental loading is a major challenge facing designers. A numerical method was developed to simulate the dynamic interaction of the soil-pile-structure system and validated by comparison with existing simulation results. The research investigated the effects of soil plasticity, stiffness degradation, and environmental loads on the dynamic responses of MOWTs. The results can support the seismic design of MOWTs.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Industrial
He Li, C. Guedes Soares
Summary: A model is proposed to assess the failure rates of components of floating offshore wind turbines based on the knowledge of failure data of corresponding structures of onshore wind turbines with sufficient failure data. The results indicate that the failure rates of components of floating offshore wind turbines are higher than those of onshore devices. The model presented contributes to the risk, failure, and reliability analysis and assessment under insufficient data conditions.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Review
Green & Sustainable Science & Technology
N. Y. Sergiienko, L. S. P. da Silva, E. E. Bachynski-Polic, B. S. Cazzolato, M. Arjomandi, B. Ding
Summary: The wind energy industry is shifting towards offshore installations, allowing for larger wind turbines to be deployed in deep-water regions with higher and steadier wind speeds. This article provides an overview of the trends in wind energy systems for offshore applications, reviews existing semi-submersible platforms, and analyzes techniques proposed to upscale floating support structures for larger wind energy systems, with a focus on system dynamics.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Engineering, Civil
M. Albiez, J. Damm, T. Ummenhofer, H. Ehard, C. Schuler, M. Kaufmann, T. Vallee, S. Myslicki
Summary: The wind energy sector is seeking to improve the efficiency of their offshore facilities through the use of larger structures. This paper presents a novel hybrid joint that combines adhesive bonding with welding to allow for even larger offshore structures. The design and manufacturing concept were simulated numerically, and the solution greatly reduces complex and costly welding operations on the legs of the jacket structure. The hybrid joint offers an alternative to welding on the primary structural elements, resulting in reduced stresses and potential weakening.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Marine
Xinglei Cheng, Maolin Li, Chao Ma, M. Hesham El Naggar, Piguang Wang, Xiaohan Sun
Summary: This paper presents a numerical method for analyzing the dynamic responses of tripod pile foundation installed in clay. The study reveals that the ultimate bearing capacity of the foundation is significantly affected by the loading direction and exhibits different characteristics under one-way and two-way cyclic loading. The foundation experiences cumulative rotation angles under seismic load, with the tower top and the top of tripod support experiencing the maximum bending moment and displacement.
Article
Green & Sustainable Science & Technology
Sung-ho Hur
Summary: A new control strategy of sharing controllers/converters for wind turbines is proposed to improve reliability and energy yield, especially for offshore wind turbines. The Matlab/Simulink model is utilized for simulation of each turbine, as well as for simulating clusters of multiple turbines.
Article
Acoustics
Uwe Stober, Frank Thomsen
Summary: The study found that the underwater sound levels of operational offshore wind farms increase with the size of wind turbines, with a shift to direct drive technology expected to reduce noise levels. According to the criteria, a 10 MW direct drive turbine could cause behavioral responses in marine mammals within a range of 1.4 km.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Review
Green & Sustainable Science & Technology
Zhiyu Jiang
Summary: This paper reviews the technical aspects of offshore wind turbine installation, covering classification, methods, challenges, and future developments in the field.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Engineering, Marine
Erik Vanem
SHIPS AND OFFSHORE STRUCTURES
(2019)
Article
Engineering, Ocean
Bingjie Guo, Odin Gramstad, Erik Vanem, Elzbieta Bitner-Gregersen
JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME
(2019)
Article
Computer Science, Artificial Intelligence
Andreas Brandsaeter, Erik Vanem, Ingrid K. Glad
EXPERT SYSTEMS WITH APPLICATIONS
(2019)
Article
Engineering, Environmental
Erik Vanem
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2019)
Article
Engineering, Civil
Erik Vanem, Tiago Fazeres-Ferradosa, Paulo Rosa-Santos, Francisco Taveira-Pinto
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-MARITIME ENGINEERING
(2019)
Article
Engineering, Ocean
Erik Vanem, Odin Gramstad, Elzbieta M. Bitner-Gregersen
APPLIED OCEAN RESEARCH
(2019)
Review
Engineering, Marine
Emma Ross, Ole Christian Astrup, Elzbieta Bitner-Gregersen, Nigel Bunn, Graham Feld, Ben Gouldby, Arne Huseby, Ye Liu, David Randell, Erik Vanem, Philip Jonathan
Article
Engineering, Marine
Erik Vanem, Bingjie Guo, Emma Ross, Philip Jonathan
Editorial Material
Engineering, Civil
T. Fazeres-Ferradosa, P. Rosa-Santos, F. Taveira-Pinto, E. Vanem, H. Carvalho, J. Correia
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-MARITIME ENGINEERING
(2019)
Article
Energy & Fuels
Erik Vanem, Andreas Hafver, Gladys Nalvarte
Article
Engineering, Marine
Azzeddine Bakdi, Ingrid Kristine Glad, Erik Vanem, Oystein Engelhardtsen
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2020)
Article
Engineering, Ocean
Erik Vanem
APPLIED OCEAN RESEARCH
(2020)
Article
Engineering, Marine
Odin Gramstad, Christian Agrell, Elzbieta Bitner-Gregersen, Bingjie Guo, Eivind Ruth, Erik Vanem
Proceedings Paper
Engineering, Ocean
Erik Vanem, Bingjie Guo
PROCEEDINGS OF THE ASME 38TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2019, VOL 3
(2019)
Article
Engineering, Ocean
Canjun Yang, Dingze Wu, Puzhe Zhou, Shuyang Ma, Rui Zhou, Xin Zhang, Yang Zhang, Qingchao Xia, Zeliang Wu
Summary: The Argo Global Ocean Observing Network is the preeminent ocean observation network worldwide, but its buoys fail to complete long-term observations in designated sea areas due to their lack of lateral movement. To solve this problem, a portable underwater profiler (PUP) that combines buoy and underwater glider functionalities was developed. The PUP is lightweight, allows for rapid deployment, and enables continuous observation.
APPLIED OCEAN RESEARCH
(2024)
Article
Engineering, Ocean
Knut Andreas Kvale, Bernt Leira, Ole Oiseth
Summary: As future floating bridges become longer, the chance of encountering significant inhomogeneous wave conditions increases. This paper presents an approach to model these conditions using generalized harmonic decomposition and applies it to a conceptual floating bridge model in Norway. The paper focuses on frequency-domain simulation and highlights the importance of considering the coherency in swell sea conditions.
APPLIED OCEAN RESEARCH
(2024)