Blar i NTNU Open på forfatter "Jiang, Zhiyu"
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A Numerical Study on a Flopper Stopper for Leg Positioning of a Jack-Up Barge
Jiang, Zhiyu; Guachamin Acero, Wilson Ivan; Gao, Zhen; Li, Lin (Chapter; Peer reviewed, 2017)Jack-up barges are commonly used for marine operations in the offshore oil and gas, and offshore wind industries. A critical phase within the marine operation activities is the positioning of the jack-up legs onto the ... -
A parametric study on the final blade installation process for monopile wind turbines under rough environmental conditions
Jiang, Zhiyu; Gao, Zhen; Ren, Zhengru; Li, Ye; Duan, Lei (Journal article; Peer reviewed, 2018)Single blade installation is a method for installing wind turbine blades. If a jack-up vessel is used during an o shore installation, the wind turbine blade is mainly subjected to wind loads and experiences resonant motions, ... -
A Summary of the Recent Work at NTNU on Marine Operations Related to Installation of Offshore Wind Turbines
Gao, Zhen; Verma, Amrit Shankar; Zhao, Yuna; Jiang, Zhiyu; Ren, Zhengru (Chapter, 2018)In this paper, a summary of the recent work at NTNU on the installation of offshore wind turbines using jack-up and floating vessels will be reported. The wind turbine components considered here are the monopile foundations ... -
Active Single-Blade Installation Using Tugger Line Tension Control and Optimal Control Allocation
Ren, Zhengru; Skjetne, Roger; Jiang, Zhiyu; Gao, Zhen (Peer reviewed; Journal article, 2020)The single-blade installation is a common method for the installation of wind turbine blades. In an offshore installation, a jackup vessel is often involved, and a crane is used to lift, move, and bolt each blade onto the ... -
Active tugger line force control for single blade installation
Ren, Zhengru; Jiang, Zhiyu; Gao, Zhen; Skjetne, Roger (Journal article, 2018)Single blade installation is one of the methods for installing large wind turbine blades at an offshore site. During this installation, each blade is lifted by the main crane from the deck of an installation vessel or a ... -
Analysis of the Parametric Instability of the STC Combined Wind and Wave Energy Concept
Appiah, Sevyllen Kistnen (Master thesis, 2017)The purpose of this study is to numerically predict such unstable motions for regular and irregular wave conditions and to compare the results with the experimental observations. First, a literature study on Mathieu ... -
Chapter 9 Modeling and Analysis of Offshore Floating Wind Turbines
Jiang, Zhiyu; Zhu, Xiangqian; Hu, Weifei (Chapter, 2018)Offshore wind reserves vast amount of energy that could be effectively tapped to meet the demand for a greener global energy portfolio. To date, only a small fraction of offshore wind resources has been accessed worldwide, ... -
Comparative numerical and experimental study of the global responses of the spar-torus-combination in extreme waves due to the bottom slamming effect
Saletti, Massimiliano (Master thesis, 2018)The purpose of this graduation thesis "Comparative numerical and experimental study of the global responses of the spar-torus-combination in extreme waves due to the bottom slamming effect" is to investigate the effects ... -
Comparison of numerical modelling techniques for impact investigation on a wind turbine blade
Verma, Amrit Shankar; Vedvik, Nils Petter; Haselbach, Philipp Ulrich; Gao, Zhen; Jiang, Zhiyu (Journal article; Peer reviewed, 2019)Wind turbine blades are exposed to numerous impact risks throughout their lifetimes. The impact risks range from bird collisions during operation to impacts with surrounding structures at the time of transportation and ... -
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 ... -
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 ... -
Drivetrain load effects in a 5-MW bottom-fixed wind turbine under blade-pitch fault condition and emergency shutdown
Rasekhi Nejad, Amir; Jiang, Zhiyu; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2016)In this paper, the effect of the blade-pitch fault and emergency shutdown on drivetrain responses in a 5-MW bottom-fixed wind turbine are investigated. A 5-MW reference gearbox with 4-point support is employed and the ... -
Dynamic Analysis of a Floating Wind Turbine with a Hydraulic Transmission System
Yang, Limin; Jiang, Zhiyu; Gao, Zhen; Moan, Torgeir (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 ... -
Dynamic response analysis of a catamaran installation vessel during the positioning of a wind turbine assembly onto a spar foundation
Jiang, Zhiyu; Li, Lin; Gao, Zhen; Halse, Karl Henning; Sandvik, Peter Christian (Journal article; Peer reviewed, 2018)Installation of floating wind turbines is a challenging task. The time and costs are closely related to the installation method chosen. This paper investigates the performance of an efficient installation concept – a ... -
Dynamic response analysis of a catamaran wind turbine installation vessel with focus on the transportation stage
Rangel Valdes, Jorge Luis (Master thesis, 2018)The United Nations have agreed on the Sustainable Development Goals for the world where one of them is to achieve affordable and clean energy for the whole world for which wind energy would be a good option. Additionally, ... -
Effects of Wind-Wave Misalignment on a Wind Turbine Blade Mating Process: Impact Velocities, Blade Root Damages and Structural Safety Assessment
Verma, Amrit Shankar; Jiang, Zhiyu; Ren, Zhengru; Gao, Zhen; Vedvik, Nils Petter (Peer reviewed; Journal article, 2020)Most wind turbine blades are assembled piece-by-piece onto the hub of a monopile-type offshore wind turbine using jack-up crane vessels. Despite the stable foundation of the lifting cranes, the mating process exhibits ... -
Foundations of offshore wind turbines: A review
Wu, Xiaoni; Hu, Yu; Li, Ye; Yang, Jian; Duan, Lei; Wang, Tongguang; Adcock, Thomas; Jiang, Zhiyu; Gao, Zhen; Lin, Zhiliang; Borthwick, Alistair; Liao, Shijun (Journal article; Peer reviewed, 2019)Offshore wind is a source of clean, renewable energy of great potential value to the power industry in the context of a low carbon society. Rapid development of offshore wind energy depends on a good understanding of ... -
Impact assessment of a wind turbine blade root during an offshore mating process
Verma, Amrit Shankar; Jiang, Zhiyu; Vedvik, Nils Petter; Gao, Zhen; Ren, Zhengru (Journal article; Peer reviewed, 2019)Single-blade installation is a popular method for installing blades on bottom-fixed offshore wind turbines. A jack-up crane vessel is often employed, and individual blades with their roots equipped with mechanical joints ... -
Integrated GNSS/IMU Hub Motion Estimator for Offshore Wind Turbine Blade Installation
Ren, Zhengru; Skjetne, Roger; Jiang, Zhiyu; Gao, Zhen; Verma, Amrit Shankar (Journal article; Peer reviewed, 2019)Offshore wind turbines (OWTs) have become increasingly popular for their ability to harvest clean offshore wind energy. Bottom-fixed foundations are the most used foundation type. Because of its large diameter, the foundation ... -
Long-term Response Analysis of Wind Turbines with an Emphasis on Fault and Shutdown Conditions
Jiang, Zhiyu (Doctoral thesis at NTNU;2014:266, Doctoral thesis, 2014)Wind turbines are exposed to a variety of load conditions during their 20-year service life. After installation, every turbine experiences operational, shutdown, and parked conditions, and any of these conditions might ...