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mdpi.com
article
https://www.mdpi.com/2071-1050/15/24/16878
The Diagnostics of Power Boilers in Terms of Their Sustainability. A Novel Semi-Spar Floating Wind Turbine Platform Applied for Intermediate Water Depth. The aim is to provide a snapshot of some of the most exciting work published in the various research areas of the journal. The current review focuses on studies concerning the numerical simulations of offshore wind turbine dynamics, including the modelling of the aerodynamic and hydrodynamic conditions of the environment and the reduced-order modelling of the wind turbine dynamic responses. In detail, the functions and mechanisms of each module in the numerical simulation of the wind turbine dynamics are articulated, which in turn demonstrates its importance for the design of offshore wind turbines, and hence the development of the offshore wind industry. Based on this review, it is argued that the vertical variations in wind velocities, the blade element momentum theory, the wave dynamic models, and the reduced-order model for structural dynamics are the major concerns for the numerical simulation of wind turbines.
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link.springer.com
article
https://link.springer.com/article/10.1007/s11804-026-00845-2
# Consistency Assurance between Integrated Load Analysis and a Structural Model in Time-domain Analysis for a Floating Offshore Wind Turbine. This paper presents a validation for load recovery and its influence on the structural response in the time domain. As an application, structural analysis of a conventional semisubmersible FOW (floating offshore wind) platform supporting a 15 MW turbine is performed using both open-source (OpenFAST) and commercial (OrcaFlex) software for integrated load analyses. The present study shows the importance of load balance to ensure the reliability of response-based time-domain structural analysis. ### Time-Domain Response-Based Structural Analysis on a Floating Offshore Wind Turbine. ### Integrated Load and Dynamic Structural Analysis of a Floating Wind Turbine Substructure. Kyoung JH, Samaria S, Kim JW (2020) Time-domain structural fatigue analysis of floating offshore platforms: A response based technique. *et al.* Consistency Assurance between Integrated Load Analysis and a Structural Model in Time-domain Analysis for a Floating Offshore Wind Turbine.
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ocw.tudelft.nl
article
https://ocw.tudelft.nl/wp-content/uploads/Offshorewindfarmhfd6.pdf
Modelling offshore wind turbines. Time domain simulation • Fourier transforms and linear systems Time domain Frequency domain
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youtube.com
video
https://www.youtube.com/watch?v=GGj9MxbgZek
Offshore Wind Explained E4: What are the differences of frequency domain and time domain methods?
DNV - Digital Solutions
6520 subscribers
32 likes
25330 views
18 Jul 2024
In this video, Jens Lohne Eftang, Principal Computational Scientist and technical lead for Sesam workflows for floating offshore wind, explains the differences between frequency domain and time domain methods.
Read more about time domain method here: https://www.dnv.com/article/time-domain-analysis-for-floating-offshore-wind-substructure-design/
And frequency domain method here: https://www.dnv.com/article/frequency-domain-analysis-for-floating-offshore-wind-substructure-design-251935/
As offshore structures become more complex, the computational models also become larger, leading to more expensive analyses. Choosing the right methodology for the design phase is critical, and the key is to minimize computational cost while maintaining required accuracy. This is a significant challenge for floating offshore wind substructures. We've worked closely with partners and customers to provide new solutions to this challenge.
Frequency Domain Methods
The frequency domain uncoupled method is the quickest method available in Sesam, typically used for initial sizing, early design, or prototype phases. This method involves a hydrodynamic and finite element analysis of the wave-induced structure response for specified wave directions and frequencies. It accounts for moorings and includes the wind turbine represented as a point mass, with wind loads provided by the manufacturer for fatigue (FLS) or ultimate limit state (ULS) analysis. While fast, this method has some limitations and assumptions that need consideration.
Time Domain Methods
Sesam offers three time domain workflows that balance performance and accuracy differently. In general, time domain methods are more accurate than frequency domain methods because they consider the simultaneous effects of wind and wave loading.
1. Time Domain Direct Load Generation Method: The most general method, generating hydrodynamic pressure and Morrison loads directly in the time domain before mapping them to a finite element structure. This method explores nonlinear hydrodynamic effects and dynamic local structure response, serving as a baseline for using faster methods.
2. Time Domain Load Reconstruction Method: A faster method, reconstructing pressure using results from coupled analysis combined with precomputed pressure components associated with unit waves and motions. It allows for dynamic or quasi-static local structure response but cannot include nonlinear hydrodynamic effects.
3. Time Domain Response Reconstruction Method: The fastest time domain method, reconstructing local quasi-static structure response using coupled analysis results and precomputed responses associated with unit waves, motions, and loads. This method avoids separate finite element analysis, reducing simulation time from hours to minutes for each design load case.
Chapters:
0:00-0:20 Introducing Jens Lohne Eftang
0:20-0:55Choosing the right methodology when offshore structures become more complex
0:55-01:43 The frequency domain uncoupled method
01:43-02:41 Sesam offers three time-domain workflows which in different ways balance performance and accuracy.
02:41-03:22 The Time Domain Load reconstruction method
03:22-04:28 Time Domain Response Reconstruction method
04:28-04:40 Thank you for watching
Subscribe to our channel and stay tuned: https://www.youtube.com/playlist?list=PL2EsH0WLHwsxENZGBjz8B3fBdl5Mf4RFF
#FloatingOffshoreWind #Sesam #FrequencyDomain #TimeDomain #DNV
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dnv.com
article
https://www.dnv.com/article/time-domain-analysis-for-floating-offshore-wind-s…
# Time domain analysis for floating offshore wind substructure design. The expansion of the offshore wind industry to deeper water depths requires the usage of floating wind support structures, bringing new challenges to the industry. * Time Domain Direct Load Generation method: This is the most general method where hydrodynamic pressure and Morison loads are generated directly in the time domain before they are mapped to a structural Finite Element model. * Time Domain Load Reconstruction method: This method is an evolution of the Direct Load Generation method and can be used to drastically reduce the computational cost associated with hydrodynamic load generation. This method is the fastest and may reduce the simulation time from hours for direct simulation to just a few minutes. Frequency domain analysis for floating offshore wind substructure design. Webinar: New fast time domain simulation methods for floating wind substructure design.
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nature.com
article
https://www.nature.com/articles/s41598-025-00471-y
# Study on structural dynamic response of offshore wind turbine under floating ice load. The structural dynamic characteristics of offshore wind turbines are directly related to the operational safety and equipment reliability of these turbines in service. In this study, we focus on the 5 MW offshore wind turbines and establish a three-dimensional turbulent flow field model at sea using the Kaimal wind speed spectrum. Leveraging OpenFAST’s open computing capabilities and EDEM’s discrete element analysis method, we investigate the dynamic response characteristics of wind turbines under separate and coupled effects of wind load, wave load, and ice load across different offshore working conditions. Our findings indicate that under coupling effects from wind-wave-ice loads, lateral and fore-aft displacement at the tower top as well as lateral and fore-aft bending moment at the tower foundation are greater compared to individual loads. A nonlinear finite element model of the integrated coupled ice induced vibration of a single pile offshore wind turbine structure under the combined action of wind and ice is established.
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sciencedirect.com
article
https://www.sciencedirect.com/science/article/pii/S014102962401321X
by F Zhu · 2024 · Cited by 35 — The present study aims to develop a novel methodology for the fatigue reliability analysis and design for a floating offshore wind turbine substructure
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joet.org
article
http://www.joet.org/upload/pdf/KSOE-2025-074.pdf
This paper presents a time-domain global analysis procedure and Hosun Kim and Beomil Kim incomplete load-transfer procedures, which may