A5070440298- Wave and Wind Energy Systems
- Fluid Dynamics and Vibration Analysis
- Wind Energy Research and Development
- Wind and Air Flow Studies
- Vibration and Dynamic Analysis
- Coastal and Marine Dynamics
- Ocean Waves and Remote Sensing
- Mechanical stress and fatigue analysis
- Fluid Dynamics Simulations and Interactions
- Ship Hydrodynamics and Maneuverability
- Structural Health Monitoring Techniques
- Gear and Bearing Dynamics Analysis
- Tribology and Lubrication Engineering
- Probabilistic and Robust Engineering Design
- Geotechnical Engineering and Soil Mechanics
- Marine and Offshore Engineering Studies
- Wind Turbine Control Systems
- Earthquake and Tsunami Effects
- Real-time simulation and control systems
- Hydraulic and Pneumatic Systems
- Advanced Combustion Engine Technologies
- Structural Analysis and Optimization
- Geotechnical Engineering and Underground Structures
- Aerodynamics and Fluid Dynamics Research
- Seismic Performance and Analysis
Norwegian University of Science and Technology
2016-2025
SINTEF Ocean
2014-2024
NTNU Samfunnsforskning
2017-2022
SINTEF
2017-2022
Delft University of Technology
2018
Deltares
2018
Trondheim Kommune
2016
Autonomous Undersea Systems Institute
2016
Technology Centre Prague
2012-2014
National Oceanography Centre
2012
Tension leg platform wind turbines (TLPWTs) represent one potential method for accessing offshore resources in moderately deep water. Although numerous TLPWT designs have been studied and presented the literature, there is little consensus regarding optimal design, information about effect of various design variables on structural response. In this study, a wide range parametric single-column are analyzed four different wind-wave conditions using Simo, Riflex, AeroDyn tools coupled analysis...
This article presents a method for performing Real-Time Hybrid Model testing (ReaTHM testing) of floating wind turbine (FWT). The advantage this compared to the physical modelling in an ocean basin, is that it solves Froude-Reynolds scaling conflict, which key issue FWT testing. ReaTHM allows more accurate also transient conditions, or degraded are not feasible yet with wind. originality presented lies fact all aerodynamic load components importance structure were identified and applied on...
Abstract As more floating farms are being developed, the wake interaction between multiple wind turbines (FWTs) is becoming increasingly relevant. FWTs have long natural periods in certain degrees of freedom, and large‐scale movement wake, known as meandering, occurs at very low frequencies. In this study, we use FAST.Farm to simulate a two‐turbine case with three different FWT concepts: semisubmersible (semi), spar, tension leg platform (TLP), separated by eight rotor diameters direction....
Abstract Phase I of the OC6 project is focused on examining why offshore wind design tools underpredict response (loads/motion) OC5-DeepCwind semisubmersible at its surge and pitch natural frequencies. Previous investigations showed that underprediction was primarily related to nonlinear hydrodynamic loading, so two new validation campaigns were performed separately examine different load components. In this paper, we validate a variety against test data, focusing ability accurately model...
A linearized aero-hydro-servo-elastic floating wind turbine model is presented and used to perform integrated design optimization of the platform, tower, mooring system, blade-pitch controller for a 10 MW spar turbine. Optimal solutions are found using gradient-based with analytic derivatives, considering both fatigue extreme response constraints, where objective function weighted combination system cost power quality. Optimization results show that local minima exist in soft-stiff...
ABSTRACT A coupled medium‐fidelity drivetrain model is developed and implemented in OpenFAST for a 10‐MW land‐based reference turbine. The implementation verified against fully multibody wind turbine model, including detailed drivetrain. new can simultaneously accurately estimate main bearing loads represent elastic bending of the It has low computational cost useful early design phases, sensitivity analyses complex systems like farms (where expense must be expended elsewhere). Here,...
This work examines the dynamic response of a single semi-submersible wind turbine (SSWT) based on different hydrodynamic theories. Comparisons platform motions and structural responses in are shown for simulations model with linear potential flow solution quadratic drag only Morison-type forces. The SSWT modelled this study is WindFloat carries NREL 5MW should be considered large volume structure. implies that diffraction effects by using theory viscous Morison's equation.A new coupled...
This study aims to investigate the challenges and feasibility of extending monopile technology for larger wind turbines deeper water. Preliminary designs support DTU 10 MW reference turbine were established water depths 20 m, 30 40 m 50 m. To properly account pile-soil interaction rigid pile behavior large-diameter piles, lateral soil stiffness was derived using finite element software Plaxis 3D. verify preliminary design, FLS analyses done SIMO-RIFLEX computational tool. As depth increases,...
The dynamic responses of a spar, tension leg platform (TLP), and two semisubmersible floating wind turbines (FWTs) in selected misaligned wave conditions are investigated using numerical simulation with an aero-hydro-servo-elastic computational tool. For range representative operational conditions, the motions short-term fatigue damage tower base top examined. Although some misalignment result increased both parallel perpendicular to direction, aligned waves cause largest for studied...
Real-time hybrid model testing (ReaTHM) is a new approach for conducting small-scale experimental campaign [1], [2], [3]. In the case of floating wind turbine in wave basin, aerodynamic loads on may be applied based simultaneous simulations (coupled to experiments), while and floater response are physically tested. The objective this paper demonstrate effects actuation limitation ReaTHM setup particular platform: numerical employed examine not including some components (or inducing error,...
As floating wind turbines (FWTs) increase in size and power, the relative contribution of wave loads to their global responses differs from what has been observed for 5–10 MW units. In addition, larger deflections at platform, increased natural period range some degrees freedom, RNA weight higher heights invite a review on structural modeling methods, design constraints, dynamic analysis, control systems. This paper explores these topics through analysis three spar-type 20 FWTs, with...
Coupled non-linear aero-hydro-servo-elastic simulations of three types floating wind turbines (spar, semi- submersible, and tension leg platform) are carried out for several fault cases over a range environmental conditions based on correlated wave data from the North Sea. Three particular scenarios considered: 1) blade seize, where pitch actuator one is blocked, 2) recognized by controller followed shutdown (grid disconnection aerodynamic braking), 3) grid loss shutdown. The platform...
Real-Time Hybrid Model (ReaTHM) tests of a braceless semi-submersible wind turbine were carried out at MARINTEK’s Ocean Basin in 2015. The sought to evaluate the performance floating (FWT) structure environmental conditions representative Northern North Sea. In order do so, employed new hybrid testing method, wherein simulated aerodynamic loads applied physical laboratory. test method was found work well, and is documented [1]. present describes some experimental results. results showed high...
This paper summarizes the findings from Phase Ib of Offshore Code Comparison, Collaboration, Continued with Correlation (OC5) project. OC5 is a project run under International Energy Agency (IEA) Wind Research Task 30, and focused on validating tools used for modelling offshore wind systems through comparison simulated responses select (and components) to physical test data. For project, hydrodynamic loads flexible cylinder fixed sloped bed were validated against measurements made in shallow...
This paper deals with the effect of bedplate flexibility on drivetrain dynamics a 10 MW spar type floating wind turbine. The is designed based extreme design loads and ultimate limit state (ULS) criteria. A decoupled analysis approach employed. Global dynamic turbine firstly conducted using an aero-hydro-servo-elastic code, then global response used as input to analysis. Load effects fatigue damage gears bearings in rigid flexible models different environmental conditions are compared. In...