Browsing NTNU Open by Author "Bachynski, Erin Elizabeth"
Now showing items 1-20 of 65
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A semi-analytical frequency domain model for efficient design evaluation of spar floating wind turbines
Hegseth, John Marius; Bachynski, Erin Elizabeth (Journal article; Peer reviewed, 2019)A linear model for efficient design evaluation of spar floating wind turbines is presented, and verified against a nonlinear time domain model with regards to long-term fatigue and short-term extreme response for two ... -
Analysis of wake effects on global responses for a floating two-turbine case
Wise, Adam; Bachynski, Erin Elizabeth (Journal article; Peer reviewed, 2019)While most existing modeling and analysis of floating wind turbines (FWTs) considers isolated systems, interactions among multiple FWTs arranged in an array have received little attention. In this study, two 10 MW ... -
Aspects in model testing of a monopile in steep waves
Kristiansen, Trygve; Bachynski, Erin Elizabeth; Bickert, Florent; Hniche, Abdessamad; Kocher, Vincent; Liandrat, Antoine (Chapter; Peer reviewed, 2017)Different aspects regarding model testing of a vertical, bottom-fixed monopile in steep waves are discussed. The different topics are related in the sense that they can improve the quality of experimental data. The discussion ... -
Aspects in model testing of a monopile in steep waves
Kristiansen, Trygve; Bachynski, Erin Elizabeth; Bickert, Florent; Hniche, Abdessamad; Kocher, Vincent; Liandrat, Antoine (Chapter, 2017)Different aspects regarding model testing of a vertical, bottom-fixed monopile in steep waves are discussed. The different topics are related in the sense that they can improve the quality of experimental data. The discussion ... -
Assessment of experimental uncertainty for a floating wind semisubmersible under hydrodynamic loads
Robertson, Amy N.; Bachynski, Erin Elizabeth; Gueydon, Sebastien; Wendt, Fabian; Schünemann, Paul; Jonkman, Jason (Chapter, 2018)The objective of this paper is to assess the sources of experimental uncertainty in an offshore wind validation campaign focused on better understanding the nonlinear hydrodynamic response behavior of a floating semisubmersible. ... -
Changes in surge and pitch decay periods of floating wind turbines for varying wind speed
Souza, Carlos Eduardo Silva de; Bachynski, Erin Elizabeth (Journal article; Peer reviewed, 2019)Recently published experimental results show variations in surge and pitch decay periods of floating wind turbines (FWTs) subjected to different incident wind velocities. This paper explores the external loads acting on a ... -
A comparative study on the dynamic behaviour of 10 MW conventional and compact gearboxes for offshore wind turbines
Wang, Shuaishuai; Rasekhi Nejad, Amir; Bachynski, Erin Elizabeth; Moan, Torgeir (Peer reviewed; Journal article, 2020)This study compares the dynamic behaviour of a conventional and a compact gearbox for the DTU 10 MW wind turbine supported on a monopile offshore structure. The conventional gearbox configuration is composed of two planetary ... -
Comparison and Validation of Hydrodynamic Load Models for a Semisubmersible Floating Wind Turbine
Hegseth, John Marius; Bachynski, Erin Elizabeth; Karimirad, Madjid (Chapter, 2018)In global aero-hydro-servo-elastic analyses of floating wind turbines (FWTs), the hydrodynamic loads are usually found from potential flow theory and applied in a single point of a rigid hull. When the hull is relatively ... -
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 ... -
Computational Fluid Dynamics Reproduction of Nonlinear Loads on a Vertical Column during Extreme Irregular Wave Events
Bachynski, Erin Elizabeth; Pakozdi, Csaba; Östman, Anders Lennart; Stansberg, Carl Trygve (Journal article; Peer reviewed, 2018)Recently, a method for numerical reproduction of measured irregular wave events has been developed. The measured motion of the wave maker flaps defines the wave kinematics at the boundary of the numerical simulation in ... -
Consequences of load mitigation control strategies for a floating wind turbine
Lee, Chern Fong; Bachynski, Erin Elizabeth; Rasekhi Nejad, Amir (Peer reviewed; Journal article, 2020)Several approaches to avoid control-induced resonances of floating wind turbines have been proposed. The main focus has been on reductions in global motions and loads in the tower base. In the present work, we examine the ... -
Correlation between Acceleration and Drivetrain Load Effects for Monopile Offshore Wind Turbines
Rasekhi Nejad, Amir; Bachynski, Erin Elizabeth; Li, Lin; Moan, Torgeir (Journal article; Peer reviewed, 2016)This paper investigates the correlation between the tower-top axial acceleration and the load effects in drivetrain components in a monopile (bottom-fixed) offshore wind turbine. In designing offshore wind turbines, it is ... -
Critical assessment of hydrodynamic load models for a monopile structure in finite water depth
Suja, Loup; Bachynski, Erin Elizabeth; Pierella, Fabio; Borg, Michael; Krokstad, Jørgen R; Bredmose, Henrik (Peer reviewed; Journal article, 2020)The response from steep and breaking waves for a monopile structure is investigated by analysis of experimental results and by application of numerical models for six irregular sea states. The experimental monopile was ... -
Critical assessment of non-linear hydrodynamic load models for a fully flexible monopile offshore wind turbine
Suja, Loup; Krokstad, Jørgen R; Bachynski, Erin Elizabeth (Journal article; Peer reviewed, 2018)This paper presents a comparison between experimental data of a model-scale 4 MW monopile offshore wind turbine subjected to extreme irregular sea states in finite water and the numerical models suggested in offshore wind ... -
Definition of the INO WINDMOOR 12 MW base case floating wind turbine
Silva de Souza, Carlos Eduardo; Berthelsen, Petter Andreas; Eliassen, Lene; Bachynski, Erin Elizabeth; Engebretsen, Espen; Haslum, Herbjørn (Research report, 2021)WINDMOOR is a Competence Building Project (KPN), with the main objective of improving the understanding of loads governing the mooring system design of floating wind turbines (FWTs). As a base case, the project adopts a ... -
Design and Dynamic Analysis of Tension Leg Platform Wind Turbines
Bachynski, Erin Elizabeth (Doktoravhandlinger ved NTNU, 1503-8181; 2014:86, Doctoral thesis, 2014)There is an increasing interest in using wind turbines oshore, and in deeper water. The tension leg platform wind turbine (TLPWT) concept is promising for intermediate (45 - 150 m) or deep (> 150 m) water. The limited ... -
Design and fatigue analysis of monopile foundations to support the DTU 10 MW offshore wind turbine
Velarde, Joey; Bachynski, Erin Elizabeth (Journal article; Peer reviewed, 2017)This study aims to investigate the challenges and feasibility of extending monopile technology for larger wind turbines and deeper water. Preliminary monopile designs to support the DTU 10 MW reference wind turbine were ... -
Design Optimization of Spar Floating Wind Turbines Considering Different Control Strategies
Hegseth, John Marius; Bachynski, Erin Elizabeth; Martins, Joaquim R. R. A. (Peer reviewed; Journal article, 2020)One of the challenges related to the design of floating wind turbines (FWTs) is the strong interactions between the controller and the support structure, which may result in an unstable system. Several control strategies ... -
Dynamic analysis of floating wind turbines during pitch actuator fault, grid loss, and shutdown
Bachynski, Erin Elizabeth; Etemaddar, Mahmoud; Kvittem, Marit Irene; Luan, Chenyu; Moan, Torgeir (Journal article; Peer reviewed, 2013)Coupled non-linear aero-hydro-servo-elastic simulations of three types of floating wind turbines (spar, semi- submersible, and tension leg platform) are carried out for several fault cases over a range of environmental ...