Blar i NTNU Open på forfatter "Gao, Zhen"
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Design and Analysis of a Braceless Steel 5-MW Semi-Submersible Wind Turbine
Luan, Chenyu; Gao, Zhen; Moan, Torgeir (Chapter; Peer reviewed, 2016)This paper introduces the design data and numerical analysis of a braceless steel semi-submersible wind turbine. The hull of the semi-submersible wind turbine is designed to support a reference 5-MW horizontal axis wind ... -
Design and analysis of a semi-submersible vertical axis wind turbine
Siddique, Muhammad Abu Zafar (Master thesis, 2017)Wind energy are deployed by two types of wind turbines. They are Horizontal Axis Wind Turbine (HAWT) and Vertical Axis Wind Turbine (VAWT), classified according to their axis of rotation. In recent years, offshore wind ... -
Design and Analysis of Mooring System for Semi-submersible Floating Wind Turbine in Shallow Water
Xu, Kun (Doctoral thesis, 2020)Floating wind turbines are necessary to produce power from wind in deeper water where bottom-fixed wind turbines are not economically competitive. However, it is still not clear to which water depth a floating wind turbine ... -
Design and Analysis of Mooring System for Semi-submersible Floating Wind Turbines in Shallow Water
Xu, Kun (Master thesis, 2015)There has been a remarkable development in offshore wind energy. From the view of cost efficiency, floating wind turbine becomes more competitive than bottom fixed wind turbine when the water depth comes above 50 m. ... -
Design and Analysis of Semi-submersible Floating Wind Turbines with focus on Structural Response Reduction
Vittori, Felipe Eduardo (Master thesis, 2015)Floating structures as spar, semi-submersibles and TLP have been proposed for offshore wind turbines for deep waters (>60m) according to the report of Arapogianni, Moccia, Williams, & Phillips (2011), where bottom fixed ... -
Design and comparative analysis of alternative mooring systems for floating wind turbines in shallow water with emphasis on ultimate limit state design
Xu, Kun; Larsen, Kjell; Shao, Yanlin; Zhang, Min; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2021)Floating wind turbines represent a cost-efficient energy solution in deep water where bottom-fixed wind turbine becomes excessively expensive. However, mooring design is quite challenging for all shallow water depths ... -
Design and Dynamic Analysis of a Steel Pontoon-type Semi-submersible Floater Supporting the DTU 10MW Reference Turbine
Wang, Qiang (Master thesis, 2014)In recent years, oshore wind energy has experienced a huge development. Floating wind turbines may become competitive for water depth larger than 50m. However, high cost is still the main challenge for the oshore wind ... -
Design and Hydrodynamic Analysis of a Semi-submersible with Two 5WM Wind Turbines
Ai, Peng (Master thesis, 2016)Offshore wind energy has been experiencing a rapid development for last decade. High cost is still the main challenge for the offshore wind industry. Additionally, bottom fixed floating wind turbines may become costly for ... -
Design of a Counter Weight Suspension System for the TetraSpar Floating Offshore Wind Turbine
Pereyra, Brandon Thomas (Master thesis, 2018)New floating wind turbine designs are needed to reduce production costs and to increase mass production feasibility. The TetraSpar floating wind turbine achieves these goals by being constructed using components highly ... -
Design, Modelling and Analysis of a Large Floating Dock for Spar Floating Wind Turbine Installation
Jiang, Zhiyu; Yttervik, Rune; Gao, Zhen; Sandvik, Peter Christian (Peer reviewed; Journal article, 2020)Installation of floating wind turbines at the offshore site is a challenging task. A significant part of the time efficiency and costs are related to the installation methods which are sensitive to weather conditions. This ... -
Design, Numerical Modelling and Analysis of a Semi-submersible Floater Supporting the DTU 10MW Wind Turbine.
Islam, Md Touhidul (Master thesis, 2016)In recent years, the demand for renewable energy has increased significantly because of its lower environmental impact than conventional energy technologies. Wind power is one of the most important sources of renewable ... -
Design, numerical modelling and analysis of a spar floater supporting the DTU 10MW wind turbine
Xue, Wenfei (Master thesis, 2016)Nowadays, wind energy is one of the most promising, sustainable and clean energy solutions for the future. The wind industry in Europe experiences a very fast development these years, moving from onshore to offshore in ... -
Design, Numerical Modelling and Analysis of TLP Floater Supporting the DTU 10MW Wind Turbine
Tian, Xiaoshuang (Master thesis, 2016)The application of big-size wind turbine is constrained to land-base and shallow water nowadays. It is still challenging to build big-size offshore wind turbines in deep water. But challenge means opportunity. This thesis ... -
Development and application of a simulator for offshore wind turbine blades installation
Ren, Zhengru; Jiang, Zhiyu; Skjetne, Roger; Gao, Zhen (Journal article, 2018)In an offshore environment, offshore wind energy resources are more available and stable, but the investment cost is much higher than that of onshore wind. The installation cost is a crucial factor of the investment. With ... -
Development and verification of a time-domain approach for determining forces and moments in structural components of floaters with an application to floating wind turbines
Luan, Chenyu; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2017)Structural design of the floater is an important aspect in developing cost efficient and reliable floating wind turbines. It is difficult to well account for the effect of strong non-linear dynamic characteristics and ... -
Development of a 5 MW reference gearbox for offshore wind turbines
Rasekhi Nejad, Amir; Guo, Yi; Gao, Zhen; Moan, Torgeir (Journal article, 2016)This paper presents detailed descriptions, modeling parameters and technical data of a 5MW high-speed gearbox developed for the National Renewable Energy Laboratory offshore 5MW baseline wind turbine. The main aim of this ... -
Development of a Frequency-domain Model for Dynamic Analysis of the Floating Wind Turbine Concept - WindFloat
Riste, Kristine Bøyum (Master thesis, 2016)In this master thesis a frequency domain method for dynamic response analysis of the floating wind turbine, WindFloat, has been established. The topic of response analysis in frequency domain is important for reducing ... -
Diagnostic monitoring of drivetrain in a 5 MW spar-type floating wind turbine using Hilbert spectral analysis
Ghane, Mahdi; Nejad, Amir Rasekhi; Blanke, Mogens; Gao, Zhen; Moan, Torgeir (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 ... -
Digital twin based virtual sensor for online fatigue damage monitoring in offshore wind turbine drivetrains
Mehlan, Felix Christian; Nejad, Amir R.; Gao, Zhen (Peer reviewed; Journal article, 2022)In this article a virtual sensor for online load monitoring and subsequent remaining useful life (RUL) assessment of wind turbine gearbox bearings is presented. Utilizing a Digital Twin framework the virtual sensor combines ... -
Digital Twins for Fault Prognosis in Offshore Wind Turbine Drivetrains
Mehlan, Felix Christian (Doctoral theses at NTNU;2024:178, Doctoral thesis, 2024)This thesis investigates the relatively novel concept of Digital Twin (DT) in the context of offshore wind turbine drivetrains. DT can be described as a virtual representation of a system or asset that calculates system ...