Browsing NTNU Open by Author "Zhao, Yuna"
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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 ... -
An Integrated Dynamic Analysis Method for Simulating Installation of a Single Blade for Wind Turbines
Zhao, Yuna; Cheng, Zhengshun; Sandvik, Peter Christian; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2018)Installation of blades for wind turbines is challenging due to large lifting height and high precision. Assessment of blade dynamic responses during installation needs advanced simulation tools which are limited at present. ... -
Assessment of allowable sea states for offshore wind turbine blade installation using time-domain numerical models and considering weather forecast uncertainty
Wu, Mengning; Gao, Zhen; Zhao, Yuna (Peer reviewed; Journal article, 2022)Installation of offshore wind turbines, particularly blades, is challenging and should be executed within the allowable limit of sea states to ensure the safety and the efficiency of installation. During the execution phase ... -
Effect of floater flexibility on global dynamic responses of a 15-MW semi-submersible floating wind turbine
Li, Haoran; Gao, Zhen; Bachynski-Polic, Erin Elizabeth; Zhao, Yuna; Fiskvik, Stian (Peer reviewed; Journal article, 2023)Floater structural flexibility plays a significant role in accurate predictions of global dynamic responses of floating wind turbines (FWTs), especially for ultra-large wind turbines with increasing size and cost-effective ... -
Explicit Structural Response-Based Methodology for Assessment of Operational Limits for Single Blade Installation for Offshore Wind Turbines
Verma, Amrit Shankar; Zhao, Yuna; Gao, Zhen; Vedvik, Nils Petter (LNCE;volume 23, Chapter, 2019)The growing requirements of large-sized offshore wind turbines require heavier components to be lifted to large heights using installation vessels. This imposes a substantial risk of impact to the lifted components especially ... -
Numerical Modelling and Analysis of the Dynamic Motion Response of an Offshore Wind Turbine Blade during Installation by a Jack-Up Crane Vessel
Zhao, Yuna; Cheng, Zhengshun; Sandvik, Peter Christian; Gao, Zhen; Moan, Torgeir; van Buren, Eric (Journal article; Peer reviewed, 2018)Jack-up crane vessels are commonly used to install offshore wind turbine blades and other components. A jack-up crane vessel is subjected to wind and wave loads, which cause motion at crane tip. Excessive motion at crane ... -
Numerical Modelling and Dynamic Analysis of Offshore Wind Turbine Blade Installation
Zhao, Yuna (Doctoral theses at NTNU;2019:190, Doctoral thesis, 2019)Installing offshore wind turbine blades is very challenging and risky due to large lifting height and high required installation precision. Offshore single blade installation is frequently adopted because of small deck ... -
Numerical study on the feasibility of offshore single blade installation by floating crane vessels
Zhao, Yuna; Cheng, Zhengshun; Gao, Zhen; Sandvik, Peter Christian; Moan, Torgeir (Journal article; Peer reviewed, 2019)Compared with jack-up crane vessels that are now widely used in offshore wind turbine installation, floating crane vessels are more flexible with respect to working water depth and are much faster in relocation. They are ...