Feasibility study of offshore wind turbine substructures for southwest offshore wind farm project in Korea

Shi, Wei; Han, Ji Hyuk; Kim, Chang-Wan; Lee, Daeyong; Shin, Hyunkyoung; Park, Hyunchul

doi:10.1016/j.renene.2014.08.039

Cited by 43 publications

(27 citation statements)

References 11 publications

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“…2,12sin(1,12t+1,03)+1,49sin(2,32t-0,43)+0,25sin(2,01t+0,75) (11) In semi-analytic solution, natural frequency of the structure w 0 is determined by Eq. (12). (12) The natural frequency and displacement values from semianalytic solution and numerical analysis are compared in Table 4.…”

Section: Verification Of Fsi Analysis and Resultsmentioning

confidence: 99%

“…The researchers have determined that the fatigue life of the truss system changes according to the design of the joints. In the study of Shi et al [12], the mono-pile, multi-pile and jacket-type substructure design is implemented on the offshore platform. An optimum performance under dynamic load was observed in the jackettype offshore structure.…”

Section: Introductionmentioning

confidence: 99%

“…The second best performance was registered for the multi-pile type model. The bidirectional fluid structure interaction is ignored in these studies [10][11][12][13]. While both the structure and the fluid are modelled in bidirectional interaction, only the structure is modelled and flow forces are transferred to the model in unidirectional interaction.…”

Section: Introductionmentioning

confidence: 99%

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Wave theory effects on behaviour of a 3D truss offshore structure

Onüçyildiz¹

2017

JCE

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Wave theory effects on behaviour of a 3D truss offshore structure Dynamic analysis of a four legged offshore truss structure under the effect of wave forces is conducted in this study. The structure is a three-storey space frame system formed of cylindrical members whose legs are supported by lateral bracings and vertical diagonals. The structure and its environment are numerically modelled by the finite elements method with the fluid-structure interaction. Due to climatic reasons, various wave theories may be applied to the structure. Therefore, the offshore environment is modelled in numerical analysis by the Linear, Stokes 2, and Stokes 5 wave theories, separately. Utjecaji teorije valova na ponašanje izvanobalne prostorne rešetkaste konstrukcije U radu je provedena dinamička analiza izvanobalne rešetkaste konstrukcije s četiri pojasa pod utjecajem sila valova. Konstrukcija je prostorni rešetkasti sustav s tri etaže formirana od cilindričnih elemenata, a čiji su pojasi osigurani uzdužnim spregovima s vertikalnim dijagonalama. Konstrukcija i njezin okoliš su numerički modelirani metodom konačnih elemenata uz interakciju fluida i konstrukcije. Zbog klimatskih razloga, konstrukcija može biti izložena različitim teorijama valova, pa je izvanobalni okoliš modeliran pomoću zasebnih teorija valova i to linearne, Stokes 2 i Stokes 5 teorije.

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Section: Verification Of Fsi Analysis and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wave theory effects on behaviour of a 3D truss offshore structure

Onüçyildiz¹

2017

JCE

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“…Renewable energy has become a mainstream subject of these investigations. e production of electrical energy from the wind energy is one of the most cost-effective and feasible projects to reduce the emissions of carbonic gas, preserve the environment, and earn carbon credits [1,2]. Wind plays a predominant role on the scene of clear energy production.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Offshore Wind Turbine Tower Dynamics with Numerical Analysis

Dağlı

Tuskan

Gökkuş

2018

Advances in Civil Engineering

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A dynamic behaviour of a cylindirical wind tower with variable cross section is investigated under environmental and earthquake forces.e ground acceleration term is represented by a simple cosine function to investigate both normal and parallel components of the earthquake motions located near ground surface. e function of earthquake force is simplified to apply Rayleigh's energy method. Wind forces acting on above the water level and wave forces acting on below this level are utilized in computations considering earthquake effect for entire structure. e wind force is divided into two groups: the force acting on the tower and the forces acting on the rotor nacelle assembly (RNA). e drag and the inertial wave forces are calculated with water particle velocities and accelerations due to linear wave theory. e resulting hydrodynamic wave force on the tower in an unsteady viscous flow is determined using the Morison equation. e displacement function of the physical system in which dynamic analysis is performed by Rayleigh's energy method is obtained by the single degree of freedom (SDOF) model. e equation of motion is solved by the fourth-order Runge-Kutta method. e two-way FSI (fluid-structure interaction) technique was used to determine the accuracy of the numerical analysis. e results of computational fluid dynamics and structural mechanics are coupled in FSI analysis by using ANSYS software. Time-varying lateral displacements and the first natural frequency values which are obtained from Rayleigh's energy method and FSI technique are compared. e results are presented by graphs. It is observed from these graphs that the Rayleigh model can be an alternative way at the prelimanary stage of the structural analysis with acceptable accuracy.

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“…The aim was to design a suitable substructure, such as a jacket or multipile, to support a 5 MW wind turbine in 33 m deep water for the Korean Southwest Offshore Wind Farm. It also aimed to compare the dynamic responses of different substructures including the monopile, jacket and multipile and evaluate their feasibility [9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic response sensitivity of an offshore wind turbine for multiple load condition

Cheng¹,

Xue²,

Wang³

et al. 2017

Proceedings of the 2nd International Conference on Computer Engineering, Information Science &Amp; Application Technology (ICCI

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Abstract. In this paper, a comprehensive study is performed on the dynamic response of an offshore wind turbine for multiple load condition. The aim is to evaluate to what extent the multiple loading affects the wind turbine for running. Based on consistent flexible multi-body models calibrated to multiple loading functions of a monopole embedded in a linear viscoelastic soil layer, fully coupled aero-hydro-elastic simulations are conducted in the nonlinear multi-body code. Correlation of wind speeds and waves is derived on basis of wind-wave scatter diagrams from China south sea. Changes of the multiple loading, the response of an offshore wind turbine are shown to be critical for the fatigue damage equivalent moment that may change with more than 20% for parked wind turbine conditions.

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Feasibility study of offshore wind turbine substructures for southwest offshore wind farm project in Korea

Cited by 43 publications

References 11 publications

Wave theory effects on behaviour of a 3D truss offshore structure

Wave theory effects on behaviour of a 3D truss offshore structure

Evaluation of Offshore Wind Turbine Tower Dynamics with Numerical Analysis

Dynamic response sensitivity of an offshore wind turbine for multiple load condition

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