Blar i Institutt for marin teknikk på tidsskrift "Energy Procedia"
Viser treff 1-17 av 17
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A comparison of two fully coupled codes for integrated dynamic analysis of floating vertical axis wind turbines
(Journal article; Peer reviewed, 2017)This paper presents a comparison of two state-of-the-art codes that are capable of modelling floating vertical axis wind turbines (VAWTs) in fully coupled time-domain simulations, being the HAWC2 by DTU and the SIMO-RIFLEX-AC ... -
A review of slamming load application to offshore wind turbines from an integrated perspective
(Journal article; Peer reviewed, 2017)In harsh sea conditions, it is possible for offshore wind turbines (OWTs) to be exposed to slamming loads due to breaking waves, especially plunging breaking waves. These slamming loads lead to significant structural ... -
Aerodynamic Modeling of Offshore Vertical Axis Wind Turbines using the Actuator Cylinder Method
(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 ... -
Assessment of the Dynamic Responses and Allowable Sea States for a Novel Offshore Wind Turbine Tower and Rotor Nacelle Assembly Installation Concept Based on the Inverted Pendulum Principle
(Journal article; Peer reviewed, 2016)This paper presents a numerical study for preliminary assessment of the dynamic responses and allowable sea states for the installation of an offshore wind turbine (OWT) tower and rotor nacelle assembly (RNA) based on a ... -
Comparison of numerical response predictions for a bottom-fixed offshore wind turbine
(Journal article; Peer reviewed, 2017)Numerical simulations are widely used for response calculations on offshore wind turbines. Code-to-code comparisons are frequently used for verification of the codes, as full-scale measurements can be difficult to obtain. ... -
Correlation between Acceleration and Drivetrain Load Effects for Monopile Offshore Wind Turbines
(Journal article; Peer reviewed, 2016)This paper investigates the correlation between the tower-top axial acceleration and the load effects in drivetrain components in a monopile (bottom-fixed) offshore wind turbine. In designing offshore wind turbines, it is ... -
Design and fatigue analysis of monopile foundations to support the DTU 10 MW offshore wind turbine
(Journal article; Peer reviewed, 2017)This study aims to investigate the challenges and feasibility of extending monopile technology for larger wind turbines and deeper water. Preliminary monopile designs to support the DTU 10 MW reference wind turbine were ... -
Diagnostic monitoring of drivetrain in a 5 MW spar-type floating wind turbine using Hilbert spectral analysis
(Journal article; Peer reviewed, 2017)The objective of this paper is to investigate the frequency-based fault detection of a 5MW spar-type floating wind turbine (WT) gearbox using measurements of the global responses. It is extremely costly to seed managed ... -
Dynamic Analysis of a Braceless Semisubmersible Offshore Wind Turbine in Operational Conditions
(Peer reviewed; Journal article, 2015)The development of cost effective floating type offshore wind turbines has been desired in deep sea areas. Semisubmersible platform can be considered as a very efficient design configuration among the different type ... -
Dynamic analysis of a floating vertical axis wind turbine under emergency shutdown using hydrodynamic brake
(Journal article; Peer reviewed, 2014)Emergency shutdown is always a challenge for an operating vertical axis wind turbine. A 5-MW vertical axis wind turbine with a Darrieus rotor mounted on a semi-submersible support structure was examined in this study. ... -
Dynamic analysis of floating wind turbines during pitch actuator fault, grid loss, and shutdown
(Journal article; Peer reviewed, 2013)Coupled non-linear aero-hydro-servo-elastic simulations of three types of floating wind turbines (spar, semi- submersible, and tension leg platform) are carried out for several fault cases over a range of environmental ... -
Experimental validation of a time-domain approach for determining sectional loads in a floating wind turbine hull subjected to moderate waves
(Journal article; Peer reviewed, 2017)To achieve cost-effective and reliable structural design of floating wind turbines, efficient and accurate time domain numerical approaches are required to analyse structural responses in design conditions, e.g. wind and ... -
Fatigue Reliability-Based Inspection and Maintenance Planning of Gearbox Components in Wind Turbine Drivetrains
(Journal article; Peer reviewed, 2014)This paper introduces a reliability-based maintenance plan for wind turbine gearbox components. The gears and bearings are graded based on their fatigue damage and a maintenance map is developed to focus on those components ... -
Long-term Analysis of Gear Loads in Fixed Offshore Wind Turbines Considering Ultimate Operational Loadings
(Journal article; Peer reviewed, 2013)The long-term extreme value analysis of gear transmitted load due to the main shaft torque is presented. Two methods, the multibody simulations (MBS) and a simplified method, are demonstrated for the gear transmitted load ... -
Rational upscaling of a semi-submersible floating platform supporting a wind turbine
(Journal article; Peer reviewed, 2016)This work examines the procedure of upscaling of a semi-submersible platform in order to support a predefined wind turbine. As a result of technological progress and design changes, basic scaling based on the turbine rating ... -
Real-time hybrid model testing of floating wind turbines: sensitivity to limited actuation
(Journal article; Peer reviewed, 2015)Real-time hybrid model testing (ReaTHM) is a new approach for conducting small-scale experimental campaign [1], [2] and [3]. In the case of a floating wind turbine in a wave basin, the aerodynamic loads on the wind turbine ... -
Sensitivity Analysis of Limited Actuation for Real-time Hybrid Model Testing of 5MW Bottom-fixed Offshore Wind Turbine
(Journal article; Peer reviewed, 2017)The present paper studies the effect of limited actuation for real-time hybrid model testing (ReaTHM® testing) of a bottom-fixed offshore wind turbine in operational, parked, and fault conditions. ReaTHM® testing is a new ...