Blar i NTNU Open på forfatter "Gao, Zhen"
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Comparative analysis of numerically simulated and experimentally measured motions and sectional forces and moments in a floating wind turbine hull structure subjected to combined wind and wave loads
Luan, Chenyu; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2018)Multi-body time-domain finite element models, which implement a recently developed numerical approach for determining forces and moments in floaters, are developed to simulate rigid-body motions and sectional forces and ... -
Comparative experimental study of the survivability of a combined wind and wave energy converter in two testing facilities
Wan, Ling; Gao, Zhen; Moan, Torgeir; Lugni, Claudio (Journal article; Peer reviewed, 2016)Combining the offshore wind and wave energy on an integrated structure or in a farm configuration is beneficial for cost reduction since they could share the infrastructure and the ocean space. The spar torus combination ... -
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 ... -
Comparative Numerical and Experimental Study of two Combined Wind and Wave Energy Concepts
Gao, Zhen; Moan, Torgeir; Wan, Ling; Michailidis, Konstantinos (Journal article, 2016)With a successful and rapid development of offshore wind industry and increased research activities on wave energy conversion in recent years, there is an interest in investigating the technological and economic feasibility ... -
Comparative Study of Lifting Operations of Offshore Wind Turbine Monopile and Jacket Substructures Considering Vessel Shielding Effects
Li, Lin; Gao, Zhen; Moan, Torgeir (Chapter, 2015)In this paper, the shielding effects from an installation vessel during lifting operations are investigated. The study compared the lifting operations of two commonly used offshore wind turbine substructures: the monopile ... -
Comparative study of short-term extreme responses and fatigue damages of a floating wind turbine using two different blade models
Qu, Xiaoqi; Li, Yan; Tang, Yougang; Chai, Wei; Gao, Zhen (Journal article; Peer reviewed, 2020)In this work, two different blade structural models are used to estimate the blade deformations and the global structural responses of a 10MW floating offshore wind turbine (FOWT). One model is based on the Euler-Bernoulli ... -
Comparison of Experimental Data of a Moored Multibody Wave Energy Device With a Hybrid CFD and BIEM Numerical Analysis Framework
Nematbakhsh, Ali; Michailidis, Konstantinos; Gao, Zhen; Moan, Torgeir (Chapter; Peer reviewed, 2015)In the present paper, a hybrid Computational Fluid Dynamics (CFD) and Boundary Integral Element Method (BIEM) framework is developed in order to study the response of a moored Multibody wave Energy Device (MED) to a ... -
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 ... -
Comparison of Numerical Simulation and Model Test for Integrated Installation of GBS Wind Turbine: Sammenligning av numerisk simulering og modellforsøk for installering av GBS vindturbin
Bense, Marvin Phillip (Master thesis, 2014)Reinertsen has developed a new installation concept for the transportation and installation of a fully assembled gravity based foundation offshore wind turbine (GBS-OWT) by means of a support double barge (DB) and standard ... -
Comparison of Potential Flow and CFD for a Column With Heave Plate
Bots, Michiel (Master thesis, 2020)Floating offshore wind turbines can only withstand a limited amount of (heave) motions before the equipment fails. In order to reduce the heave motion, the DeepCwind floater for offshore floating wind turbines makes use ... -
Comparison of vertically sided model structures with circular and rectangular cross section subjected to ice-induced vibrations in the frequency lock-in regime
Owen, Cody Carlton (Master thesis, 2017)Very recently, offshore wind energy has begun expanding into subarctic regions with seasonally ice-infested waters like the Baltic Sea. For offshore wind turbines with conventional support structures including monopiles ... -
Comparison of wave load effects on a TLP wind turbine by using computational fluid dynamics and potential flow theory approaches
Nematbakhsh, Ali; Bachynski, Erin Elizabeth; Gao, Zhen; Moan, Torgeir (Journal article; Peer reviewed, 2015)Tension Leg Platform (TLP) is one of the concepts which shows promising results during initial studies to carry floating wind turbines. One of the concerns regarding tension leg platform wind turbines (TLPWTs) is the high ... -
Comparison of Wave-induced Response of a TLP Wind Turbine Obtained by CFD Method and Potential Theory
Nematbakhsh, Ali; Bachynski, Erin Elizabeth; Gao, Zhen; Moan, Torgeir (Chapter, 2014)A computational fluid dynamics (CFD) method has been verified and compared with potential theory approach to assess the hydrodynamic loads on a tension leg platform wind turbine (TLPWT). Floating wind turbines have the ... -
Concept Design of a Floating Support Structure for Hydrophilic Crop
Huhnt, Malte Peter (Master thesis, 2019)Aquatic farming of food- and non-food products is slowly entering the public attention as growing populations and living standards worldwide drive the demand for high-quality foods. The Ocean Farm Kiel (OFK) and the ... -
Condition monitoring of spar‐type floating wind turbine drivetrain using statistical fault diagnosis
Ghane, Mahdi; Nejad, Amir Rasekhi; Blanke, Mogens; Gao, Zhen; Moan, Torgeir (Journal article, 2018)Operation and maintenance costs are significant for large‐scale wind turbines and particularly so for offshore. A well‐organized operation and maintenance strategy is vital to ensure the reliability, availability, and ... -
Coupled Analysis of a Spar Floating Wind Turbine considering both Ice and Aerodynamic Loads
Saccoman, Marine Yvette Josette (Master thesis, 2015)In this thesis a model is proposed for establishing the coupled analysis of a spar floating wind turbine considering both ice and aerodynamic loads. This topic is important within the field of renewable energies research ... -
Coupled dynamic analysis of a floating dock system for installation of a spar wind turbine
Schabrich, Mela (Master thesis, 2019)A floating dock concept has been developed to assemble spar floating wind turbines near the offshore wind farm site. The concept comprises a floating dock that is moored on site with chains to the sea bed. The dock is ... -
A data-driven approach for fault diagnosis of drivetrain system in a spar-type floating wind turbine based on the multi-point acceleration measurements
Dibaj, Ali; Nejad, Amir R.; Gao, Zhen (Peer reviewed; Journal article, 2022)This paper deals with the condition monitoring of a floating wind turbine drivetrain using multi-point acceleration measurements. Single sensor data obtained from drivetrain system may provide insufficient information about ... -
Decision-Making Support for Reeled Pipeline Installation Using a Machine Learning Based Method
Døskeland, Øystein Husevåg; Gao, Zhen; Novoseltsev, Yury; Holguin, Nicolas Fredhall (Chapter, 2023)Installation of subsea pipelines used for transportation of hydrocarbons, water, or CO2, is carried out by ship-type installation vessels, which are highly sensitive to wave conditions. The prediction of installation loads ... -
Design and analysis for a steel braceless semi-submersible hull for supporting a 5-MW horizontal axis wind turbine
Luan, Chenyu (Doctoral theses at NTNU, 2018:194, Doctoral thesis, 2018)This thesis deals with design and analysis of steel semisubmersible hulls for supporting MW-level horizontal axis wind turbines. The thesis address the following four topics: 1) conceptual design methods, 2) conceptual ...