scholarly journals Motion response analysis of floating foundation of offshore wind turbines

2019 ◽  
Vol 1168 ◽  
pp. 022008
Author(s):  
Kong-de He ◽  
Zhi-chao Chen ◽  
Xu-guang Xie ◽  
Zi-fan Fang ◽  
Xue-hui He
Keyword(s):  
Wind Turbines ◽  
Offshore Wind ◽  
Response Analysis ◽  
Motion Response ◽  
Offshore Wind Turbines ◽  
Floating Foundation

scholarly journals Impact of Typhoons on Floating Offshore Wind Turbines: A Case Study of Typhoon Mangkhut

2021 ◽  
Vol 9 (5) ◽  
pp. 543
Author(s):  
Jiawen Li ◽  
Jingyu Bian ◽  
Yuxiang Ma ◽  
Yichen Jiang
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Safety Evaluation ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Motion Response ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines ◽  
Coupling Motion

A typhoon is a restrictive factor in the development of floating wind power in China. However, the influences of multistage typhoon wind and waves on offshore wind turbines have not yet been studied. Based on Typhoon Mangkhut, in this study, the characteristics of the motion response and structural loads of an offshore wind turbine are investigated during the travel process. For this purpose, a framework is established and verified for investigating the typhoon-induced effects of offshore wind turbines, including a multistage typhoon wave field and a coupled dynamic model of offshore wind turbines. On this basis, the motion response and structural loads of different stages are calculated and analyzed systematically. The results show that the maximum response does not exactly correspond to the maximum wave or wind stage. Considering only the maximum wave height or wind speed may underestimate the motion response during the traveling process of the typhoon, which has problems in guiding the anti-typhoon design of offshore wind turbines. In addition, the coupling motion between the floating foundation and turbine should be considered in the safety evaluation of the floating offshore wind turbine under typhoon conditions.

Dynamic response in frequency and time domains of a floating foundation for offshore wind turbines

2013 ◽  
Vol 60 ◽  
pp. 115-123 ◽  
Author(s):  
Ruoyu Zhang ◽  
Yougang Tang ◽  
Jun Hu ◽  
Shengfu Ruan ◽  
Chaohe Chen
Keyword(s):  
Dynamic Response ◽  
Wind Turbines ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
Floating Foundation ◽  
Time Domains

Advanced Concept Offshore Wind Turbine Development

2014 ◽  
Vol 18 (5) ◽  
pp. 728-735 ◽  
Author(s):  
Abdollah A. Afjeh ◽  
◽  
Brett Andersen ◽  
Jin Woo Lee ◽  
Mahdi Norouzi ◽  
...  
Keyword(s):  
Wind Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Cost Savings ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Offshore Wind Energy ◽  
Offshore Wind Turbines ◽  
Floating Foundation ◽  
The Cost

Development of novel offshore wind turbine designs and technologies are necessary to reduce the cost of offshore wind energy since offshore wind turbines need to withstand ice and waves in addition to wind, a markedly different environment from their onshore counterparts. This paper focuses on major design challenges of offshore wind turbines and offers an advanced concept wind turbine that can significantly reduce the cost of offshore wind energy as an alternative to the current popular designs. The design consists of a two-blade, downwind rotor configuration fitted to a fixed bottom or floating foundation. Preliminary results indicate that cost savings of nearly 25% are possible compared with the conventional upwind wind turbine designs.

scholarly journals Influence of Model Simplifications Excitation Force in Surge for a Floating Foundation for Offshore Wind Turbines

Energies ◽  
2015 ◽  
Vol 8 (4) ◽  
pp. 3212-3224 ◽  
Author(s):  
Morten Andersen ◽  
Dennis Hindhede ◽  
Jimmy Lauridsen
Keyword(s):  
Wind Turbines ◽  
Offshore Wind ◽  
Offshore Wind Turbines ◽  
Floating Foundation ◽  
Excitation Force

scholarly journals Offshore Wind Turbines – Research and Development

2018 ◽  
Vol 2 (Special edition 2) ◽  
pp. 59-70
Author(s):  
Neven Hadžić ◽  
Ivan Ćatipović ◽  
Marko Tomić ◽  
Nikola Vladimir ◽  
Hrvoje Kozmar
Keyword(s):  
Research And Development ◽  
Wind Turbines ◽  
Offshore Wind ◽  
Response Analysis ◽  
Energy Potential ◽  
Analysis And Design ◽  
Offshore Wind Turbines ◽  
Design Procedures ◽  
Sea Current ◽  
Current Loading

The purpose of the present study is to review the state-of-the-art in research and development of offshore wind turbines in order to address the latest findings and trends in structural design and response analysis. This could enhance a development of sophisticated offshore wind turbines. To complete such a task, a detailed review of offshore wind renewable energy potential, wind, wave and sea current loading as well as structural analysis and design procedures and experimental work are presented.

WindFloat: A Floating Foundation for Offshore Wind Turbines—Part I: Design Basis and Qualification Process

2009 ◽  
Author(s):  
Dominique Roddier ◽  
Christian Cermelli ◽  
Alla Weinstein
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Oil And Gas ◽  
Large Diameter ◽  
Offshore Wind ◽  
Site Location ◽  
Offshore Wind Turbines ◽  
Design Basis ◽  
Floating Foundation ◽  
Visual Impacts

This paper and the corresponding hydrodynamic and structural study paper (also in these proceedings) summarize the feasibility study conducted for the WindFloat technology. The WindFloat is a 3-legged floating foundation for very large offshore wind turbines. It is designed to accommodate a wind turbine, 5 MW or larger, on one of the columns of the hull with minimal modifications to the tower, nacelle and turbine. Technologies for floating foundations for offshore wind turbines are evolving. It is agreed by most experts that the offshore wind industry will see a significant increase in activity in the near future. Fixed offshore turbines are limited in water depth to approximately 30∼50m. Market transition to deeper waters is inevitable, provided suitable technologies can be developed. Despite the increase in complexity, a floating foundation offers distinct advantages: • Flexibility in site location. • Access to superior wind resources further offshore. • Ability to locate in coastal regions with limited shallow continental shelf. • Ability to locate further offshore to eliminate visual impacts. • An integrated structure, without a need to redesign the mast foundation connection for every project. • Simplified offshore installation procedures. Anchors are significantly cheaper to install than fixed foundations and large diameter towers. This paper focuses on the design basis for wind turbine floating foundations, and explores the requirements that must be addressed by design teams in this new field. It shows that the design of the hull for a large wind turbine must draw on the synergies with oil and gas offshore platform technology, while accounting for the different design requirements and functionality of the wind turbine.

Research Development and Key Technical on Floating Foundation for Offshore Wind Turbines

2012 ◽  
Vol 446-449 ◽  
pp. 1014-1019 ◽  
Author(s):  
Ruo Yu Zhang ◽  
Chao He Chen ◽  
You Gang Tang ◽  
Xiao Yan Huang
Keyword(s):  
Wind Turbines ◽  
Offshore Wind ◽  
Research Development ◽  
Offshore Wind Turbines ◽  
Floating Foundation

Jump bifurcation phenomenon during varying wind speeds in floating offshore wind turbines

2022 ◽  
pp. 1-15
Author(s):  
Alwin Jose ◽  
Jeffrey M. Falzarano
Keyword(s):  
Transition Region ◽  
Wind Turbines ◽  
Large Amplitude ◽  
Offshore Wind ◽  
Nonlinear Phenomenon ◽  
Motion Response ◽  
Offshore Wind Turbines ◽  
Future Design ◽  
Wind Speeds ◽  
Floating Offshore Wind Turbines

Abstract Floating Offshore Wind Turbines (FOWTs) are susceptible to an instability which has come to be called negative damping. Conventional land based wind turbine controllers when used with FOWTs may cause large amplitude platform pitch oscillations. Most controllers have since been improved to reduce motions due to this phenomenon. In this paper, the motions induced using one of the original controllers is studied. The current study is performed using the coupled time domain program FAST-SIMDYN that was developed in Marine Dynamics Laboratory (MDL) at Texas A&M University. It is capable of studying large amplitude motions of Floating Offshore Wind Turbines. FOWTs use various controller algorithms of operation based on the available wind speed depending on various power output objectives i.e., to either maximize or level out power absorption. It is observed that the transition region for controllers is often chaotic. So most studies focus on operations away from the transition region below and above the transition wind speeds. Here we study the transition region using the theoretical insight of non-linear motion response of structures. This study reveals the presence of a very interesting and potentially hazardous nonlinear phenomenon, bifurcation. This finding could help explain the chaotic motion response that is observed in the transition region of controllers. Understanding the nature and cause of bifurcation could prove very useful for future design of FOWT controllers.

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