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Analysis of lifting operation of a monopile for an offshore wind turbine considering vessel shielding effects
(Journal article; Peer reviewed, 2014)
This study addresses numerical simulations of the lifting operation of a monopile for an offshore wind turbine with a focus on the lowering process. A numerical model of the coupled system of the monopile and vessel is ...
Joint Distribution of Environmental Condition at Five European Offshore Sites for Design of Combined Wind and Wave Energy Devices
(Journal article; Peer reviewed, 2015)
The design of wind turbines requires information about joint data for wind and wave conditions. Moreover, combining offshore wind and wave energy facilities is a potential way to reduce the cost of offshore wind farms. To ...
Response analysis of a nonstationary lowering operation for an offshore wind turbine monopile substructure
(Journal article; Peer reviewed, 2015)
This study addresses numerical modeling and time-domain simulations of the lowering operation for installation of an offshore wind turbine monopile (MP) with a diameter of 5.7 m and examines the nonstationary dynamic ...
Dynamic Analysis of a Floating Wind Turbine with a Hydraulic Transmission System
(Chapter, 2015)
A 5 MW spar-type floating wind turbine equipped with high-pressure hydraulic transmission machinery is presented in this paper. The hydraulic transmission system consists of a hydraulic pump, a nonreturn check valve, a ...
Comparative Study of Lifting Operations of Offshore Wind Turbine Monopile and Jacket Substructures Considering Vessel Shielding Effects
(Chapter, 2015)
In this paper, the shielding effects from an installation vessel during lifting operations are investigated. The study compared the lifting operations of two commonly used offshore wind turbine substructures: the monopile ...
The Effects of Surface Waves and Submergence on the Performance and Loading of a Tidal Turbine
(Chapter; Peer reviewed, 2017)
Tidal energy has the advantages of high predictability, high energy density, and limited environmental impacts. As tidal turbines are expected to be used in the most energetic waters where there might be significant waves, ...
A 5MW direct-drive generator for floating spar-buoy wind turbine: Drive-train dynamics
(Journal article; Peer reviewed, 2017)
This article proceeds with investigations on a 5 MW direct-drive floating wind turbine system (FWTDD) that was developed in a previous study. A fully integrated land-based direct-drive wind turbine system (WTDD) was created ...
Methodology for assessment of the allowable sea states during installation of an offshore Wind turbine transition piece structure onto a monopile foundation
(Journal article, 2017)
In this paper, a methodology suitable for assessing the allowable sea states for installation of a transition piece (TP) onto a monopile (MP) foundation with focus on the docking operation is proposed. The TP installation ...
Assessment of Allowable Sea States During Installation of OWT Monopiles with Shallow Penetration in the Seabed
(Journal article, 2016)
Installation of offshore wind turbines (OWTs) requires careful planning to reduce costs and minimize associated risks. The purpose of this paper is to present a method for assessing the allowable sea states for the initial ...
Model test and numerical analysis of a multi-pile offshore wind turbine under seismic, wind, wave, and current loads
(Journal article, 2017)
Offshore wind turbines (OWTs) might be subjected to seismic loads with different peak accelerations during operation in the actively seismic regions. The earthquakes might be a potential risk for the OWTs due to its ...