Blar i NTNU Open på forfatter "Jiang, Zhiyu"
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Extended Environmental Contour Methods for Long-Term Extreme Response Analysis of Offshore Wind Turbines
Chen, Xiaolu; Jiang, Zhiyu; Li, Qinyuan; Li, Ye; Ren, Nianxin (Peer reviewed; Journal article, 2020)Environmental contour method is an efficient method for predicting the long-term extreme response of offshore structures. The traditional environmental contour is obtained using the joint distribution of mean wind speed, ... -
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 ... -
Influence of variability and uncertainty of wind and waves on fatigue damage of a floating wind turbine drivetrain
Wang, Shuaishuai; Moan, Torgeir; Jiang, Zhiyu (Peer reviewed; Journal article, 2021)This study investigates the effect of variability and uncertainty of wind and wave conditions on the short-term fatigue damage of a 10-MW floating wind turbine drivetrain. Global dynamic responses of a semi-submersible ... -
Integrated dynamic analysis of a spar floating wind turbine with a hydraulic drivetrain
Jiang, Zhiyu; Yang, Limin; Gao, Zhen; Moan, Torgeir (Peer reviewed; Journal article, 2022)Conventional drivetrains with gearbox failures are associated with major downtime in offshore wind turbines. This impacts the maintenance cost and cost of energy. A hydraulic transmission eliminates the need for gearbox ... -
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 ... -
Leading Edge Erosion of Wind Turbine Blades: Effects of Environmental Parameters on Impact Velocities and Erosion Damage Rate
Verma, Amrit; Jiang, Zhiyu; Ren, Zhengru; Teuwen, Julie J.E. (Chapter, 2020)Leading edge erosion (LEE) of a wind turbine blade (WTB) is a complex phenomenon that contributes to high operation and maintenance costs. The impact between rain droplets and rotating blades exerts cyclic fatigue stresses ... -
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 ... -
Mating Control of a Wind Turbine Tower-Nacelle-Rotor Assembly for a Catamaran Installation Vessel
Jiang, Zhiyu; Ren, Zhengru; Gao, Zhen; Sandvik, Peter Christian; Halse, Karl Henning; Skjetne, Roger (Chapter, 2018)The assembly and installation costs of an offshore wind farm can approach 20% of the capital expenditures; therefore, time efficient installation methods are needed for installing offshore wind turbines. This study ... -
Minimum leading edge protection application length to combat rain-induced erosion of wind turbine blades
Verma, Amrit Shankar; Di Noi, Sandro; Ren, Zhengru; Jiang, Zhiyu; Teuwen, Julie J. E. (Peer reviewed; Journal article, 2021)Leading edge erosion (LEE) repairs of wind turbine blades (WTBs) involve infield application of leading edge protection (LEP) solutions. The industry is currently aiming to use factory based LEP coatings that can applied ... -
Numerical analysis of a vessel- shaped offshore fish farm
Li, Lin; Jiang, Zhiyu; Høiland, Andreas Vangdal; Ong, Muk Chen (Journal article; Peer reviewed, 2018)The aquaculture industry is aiming to move fish farms from nearshore areas to open seas because of many attractive advantages in the open water. However, one major challenge is to design the structure to withstand the ... -
Numerical Modeling and Simulation of the Single Blade Installation for a Spar Wind Turbine Inside a Floating Dock
Haugli, Harald Osland (Master thesis, 2022)Ønsket om å redusere CO2-utslipp og avhengighet av fossil energi har vakt betydelig interesse i markedet for vindkraft til havs. Den økende størrelsen på vindturbinene og vindparkene har presset utbyggingen inn i nye farvann ... -
Numerical study on the heading misalignment and current velocity reduction of a vessel-shaped offshore fish farm
Li, Lin; Jiang, Zhiyu; Wang, Jungao; Ong, Muk Chen (Peer reviewed; Journal article, 2019)Recently, the concept of a vessel-shaped fish farm was proposed for open sea applications. The fish farm comprises a vessel-shaped floater, five fish cages, and a single-point mooring system. Such a system weathervanes, ... -
Offshore wind turbine operations and maintenance: A state-of-the-art review
Ren, Zhengru; Verma, Amrit Shankar; Li, Ye; Teuwen, Julie J.E.; Jiang, Zhiyu (Peer reviewed; Journal article, 2021)Operations and maintenance of offshore wind turbines (OWT) play an important role in the development of offshore wind farms. Compared with operations, maintenance is a critical element in the levelized cost of energy, given ... -
Predicting the Heading Misalignment of a Vessel-Shaped Offshore Fish Farm Under Waves and Currents
Li, Lin; Jiang, Zhiyu; Wang, Jungao; Ong, Muk Chen (Chapter, 2018)A vessel-shaped fish farm concept for open sea applications has been proposed recently. The whole system consists of a vessel-shaped floater, fish cages positioned longitudinally along the floater, and a single-point mooring ... -
A probabilistic long-term framework for site-specific erosionanalysis of wind turbine blades: A case study of 31 Dutch sites
Verma, Amrit; Jiang, Zhiyu; Ren, Zhengru; Caboni, Marco; Verhoef, Hans; Mijle-Meijer, Harald; Castro, Saullo GP; Teuwen, Julie JE (Peer reviewed; Journal article, 2021)Rain-induced leading-edge erosion (LEE) of wind turbine blades (WTBs) is associated with high repair and maintenance costs. The effects of LEE can be triggered in less than 1 to 2 years for some wind turbine sites, whereas ... -
Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines
Verma, Amrit Shankar; Jiang, Zhiyu; Ren, Zhengru; Gao, Zhen; Vedvik, Nils Petter (Journal article; Peer reviewed, 2019)Installation of wind-turbine blades on monopile-type offshore wind turbines is a demanding task. Typically, a jack-up crane vessel is used, and blades are individually lifted from the vessel deck and docked with the ... -
Single blade installation using active control of three tugger lines
Ren, Zhengru; Jiang, Zhiyu; Skjetne, Roger; Gao, Zhen (Chapter, 2018)Single blade installation using jack-up vessels is a commonly used blade installation setup for offshore wind turbines. During this operation, each blade is lifted by the main crane from the deck, moved, and then bolted ... -
Structural Reliability Analysis of Wind Turbines: A Review
Jiang, Zhiyu; Hu, Weifei; Dong, Wenbin; Gao, Zhen; Ren, Zhengru (Journal article; Peer reviewed, 2017)The paper presents a detailed review of the state-of-the-art research activities on structural reliability analysis of wind turbines between the 1990s and 2017. We describe the reliability methods including the first- and ... -
Structural Safety Assessment of Marine Operations From a Long-Term Perspective: A Case Study of Offshore Wind Turbine Blade Installation
Verma, Amrit Shankar; Gao, Zhen; Jiang, Zhiyu; Ren, Zhengru; Vedvik, Nils Petter (Chapter, 2019)A marine operation is a complex non-routine activity of limited duration carried out in offshore environment. Due to safety reasons, these operations are normally performed within specific sea state limits, which are derived ...