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A combined wind and wave energy-converter concept in survivalmode: Numerical and experimental study in regular waves with afocus on water entry and exit 

Wan, Ling; Greco, Marilena; Lugni, Claudio; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2017)
Water entry (including slamming) and exit phenomena as well as green water on deck were observed during survivability model tests of a combined wind and wave energy converter concept. Here, a nonlinear numerical ...
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Stochastic Response Analysis of Mooring Systems with Emphasis on Frequency-domain Analysis of Fatigue due to Wide-band Response Processes 

Gao, Zhen (Doktoravhandlinger ved NTNU, 1503-8181; 2008:11, Doctoral thesis, 2008)
Mooring systems are widely used in the offshore industry to limit the horizontal excursions of a floating structure from desired position in order for the structure to fulfill the required tasks. Safety of mooring systems ...
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Statistical fault diagnosis of wind turbine drivetrain applied to a 5MW floating wind turbine 

Ghane, Mahdi; Rasekhi Nejad, Amir; Blanke, Mogens; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2016)
Deployment of larger scale wind turbine systems, particularly offshore wind turbine, requires more organized operation and maintenance strategies to make it as competitive as the classical electric power stations. It is ...
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Dynamic Modelling and Analysis of Three Floating Wind Turbine Concepts with Vertical Axis Rotor 

Cheng, Zhengshun; Wang, Kai; Gao, Zhen; Moan, Torgeir (Proceedings of the twenty-fifth International Ocean and Polar Engineering Conference;ISOPE 2015, Chapter; Conference object; Peer reviewed, 2015)
Recently there is an increasing interest in the development of offshore floating vertical axis wind turbines (FVAWTs). A FVAWT mounted on a semi-submersible has been proposed by several researchers, and a FVAWT with a spar ...
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Dynamic Response Analysis of Three Floating Wind Turbine Concepts with a Two-Bladed Darrieus Rotor 

Cheng, Zhengshun; Wang, Kai; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2015)
Recently, interest in the development of floating vertical axis wind turbines (FVAWTs) has been increasing, since FVAWTs might prove to be one of the optimal configurations in deep waters. In this study, a FVAWT with a 5 ...
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Numerical Study on Aerodynamic Damping of Floating Vertical Axis Wind Turbines 

Cheng, Zhengshun; Madsen, Helge A.; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2016)
Harvesting offshore wind energy resources using floating vertical axis wind turbines (VAWTs) has attracted an increasing interest in recent years. Due to its potential impact on fatigue damage, the aerodynamic damping ...
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A comparison of extreme structural responses and fatigue damage of semi-submersible type floating horizontal and vertical axis wind turbines 

Cheng, Zhengshun; Madsen, Helge Aagard; Chai, Wei; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2017)
Currently development of floating wind turbines for deep water is mainly based on horizontal axis wind turbines (HAWTs). However, floating vertical axis wind turbines (VAWTs) are possible alternative due to their potential ...
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Aerodynamic Modeling of Offshore Vertical Axis Wind Turbines using the Actuator Cylinder Method 

Cheng, Zhengshun; Madsen, Helge A.; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2016)
Recently the interest in developing vertical axis wind turbines (VAWTs) for offshore application has been increasing. Among the aerodynamic models of VAWTs, double multi-streamtube (DMST) and actuator cylinder (AC) models ...
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A fully coupled method for numerical modeling and dynamic analysis of floating vertical axis wind turbines 

Cheng, Zhengshun; Madsen, Helge A.; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2017)
Offshore wind energy is one of the most promising renewable energy resources and an increasing interest arises to develop floating vertical axis wind turbines (VAWTs), which have the potential to reduce the cost of energy. ...
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Effect of the number of blades on the dynamics of floating straight-bladed vertical axis wind turbines 

Cheng, Zhengshun; Madsen, Helge Aagard; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2017)
Floating vertical axis wind turbines (VAWTs) are promising solutions for exploiting the wind energy resource in deep waters due to their potential cost-of-energy reduction. The number of blades is one of the main concerns ...
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