• 제목/요약/키워드: wind-structure interaction

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100kW용 풍력발전기의 블레이드에 대한 유동/구조 연성해석 (Analysis of Fluid Structure Interaction on 100kW-HAWT-blade)

  • 김윤기;김경천
    • 한국가시화정보학회지
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    • 제4권1호
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    • pp.41-46
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    • 2006
  • In this study, one-way fluid structure interaction analysis(FSI) on wind turbine blade was performed. Both a quantitative fluid analysis on 3-bladed wind turbine and a structural analysis using the surface pressure data resulting from fluid analysis were carried out. Streamlines and angle of attack was easily acquired from analysis results, we showed the inlet velocity that the stall begins to occur. In the structural analysis, structural displacement and maximum stress of the two comparative models was calculated. The location that has maximum stress was found. The pressure difference between back and front part of the blade increases as the inlet velocity increase. The torque and maximum with regard to inlet velocity was also presented.

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해상풍력 석션버켓 기초 구조-지반 상호작용 비선형 구조해석 및 실험결과 비교 (Nonlinear Structure-Soil Interaction Analysis for the Suction Bucket Foundation of Offshore Wind-Turbine)

  • 진정인;김동현;정민욱
    • KEPCO Journal on Electric Power and Energy
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    • 제2권3호
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    • pp.469-475
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    • 2016
  • 최근 석유 에너지 고갈의 문제에 봉착함에 따라 신재생 에너지, 즉 풍력 에너지 분야에 대한 연구가 자연스럽게 부각되고 있다. 그 중 해상풍력은 육상풍력에 비교해 바람 자원이 풍부하기 때문에 효율성 측면에서 주목 받고 있지만 전체 시스템의 설치비용에 따른 경제성이 중요한 문제가 되고 있다. 일반적으로 해상 풍력 사업의 구성비에서 지지구조물 설치비용의 비율이 통상 25% 이상을 차지하는 경향이 있으며, 설계된 지지구조에 대해 정확한 해석과 분석이 가능 하다면 설치 및 시공분야의 경제성을 확보하는데 중요한 역할을 할 수 있다. 본 연구에서는 해상 부유식 풍력발전시스템의 경제성 확보에 중요한 역할을 할 수 있는 석션버켓 기초의 지반연성 비선형 구조해석 기법을 구축하고 이에 대한 검증을 위해 실험결과와 비교검증을 수행하였다.

Wind flow characteristics and their loading effects on flat roofs of low-rise buildings

  • Zhao, Zhongshan;Sarkar, Partha P.;Mehta, Kishor C.;Wu, Fuqiang
    • Wind and Structures
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    • 제5권1호
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    • pp.25-48
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    • 2002
  • Wind flow and pressure on the roof of the Texas Tech Experimental Building are studied along with the incident wind in an effort to understand the wind-structure interaction and the mechanisms of roof pressure generation. Two distinct flow phenomena, cornering vortices and separation bubble, are investigated. It is found for the cornering vortices that the incident wind angle that favors formation of strong vortices is bounded in a range of approximately 50 degrees symmetrical about the roof-corner bisector. Peak pressures on the roof corner are produced by wind gusts approaching at wind angles conducive to strong vortex formation. A simple analytical model is established to predict fluctuating pressure coefficients on the leading roof corner from the knowledge of the mean pressure coefficients and the incident wind. For the separation bubble situation, the mean structure of the separation bubble is established. The role of incident wind turbulence in pressure-generation mechanisms for the two flow phenomena is better understood.

기하 비선형과 항력 효과를 고려한 해상풍력발전기의 지진 응답해석 (Earthquake Response Analysis of an Offshore Wind Turbine Considering Effects of Geometric Nonlinearity of a Structure and Drag Force of Sea Water)

  • 이진호;배경태;진병무;김재관
    • 한국지진공학회논문집
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    • 제17권6호
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    • pp.257-269
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    • 2013
  • In this study, the capability of an existing analysis method for the fluid-structure-soil interaction of an offshore wind turbine is expanded to account for the geometric nonlinearity and sea water drag force. The geometric stiffness is derived to take care of the large displacement due to the deformation of the tower structure and the rotation of the footing foundation utilizing linearized stability analysis theory. Linearizing the term in Morison's equation concerning the drag force, its effects are considered. The developed analysis method is applied to the earthquake response analysis of a 5 MW offshore wind turbine. Parameters which can influence dynamic behaviors of the system are identified and their significance are examined.

유동-구조 연성해석 기법을 이용한 풍력발전시스템 해석 (Analysis of Wind Turbine system using Fluid Structure Diteraction)

  • 김윤기;김경천
    • 한국가시화정보학회:학술대회논문집
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    • 한국가시화정보학회 2006년도 추계학술대회 논문집
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    • pp.141-144
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    • 2006
  • In this study, one-way fluid structure interaction analysis(FSI) on wind turbine blade was performed. Both a quantitative fluid analysis on 3-bladed wind turbine and a structural analysis using the surface pressure data resulting from fluid analysis were carried out. Streamlines and angle of attack was easily acquired from analysis results, we showed the inlet velocity that the stall begins to occur. In the structural analysis, structural displacement and maximum stress of the two comparative models was calculated. The location that has maximum stress was found. The pressure difference between back and front part of the blade increases as the inlet velocity increase. The torque and maximum with regard to inlet velocity was also presented.

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지반-구조물 상호작용을 고려한 콘크리트 석션식 해상풍력 지지구조물의 지진거동 특성 (Seismic Behaviors of Concrete-Suction-Type Offshore Wind Turbine Supporting Structures Considering Soil-Structure Interaction)

  • 이진호;진병무;배경태
    • 한국전산구조공학회논문집
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    • 제30권4호
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    • pp.319-327
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    • 2017
  • 본 연구에서는 콘크리트 석션식 지지구조물을 사용한 해상풍력발전시스템의 지진응답 해석을 수행하여 그 거동 특성을 파악한다. 전체 시스템을 RNA, 타워, 지지구조물로 구성된 구조계와 이에 접하고 있는 유체 및 지반의 부분구조로 분리하여 운동방정식을 유도한다. 구조계에 작용하는 유체의 동수압과 지반의 상호작용력을 산정하고, 이를 구조계의 운동방정식과 결합하여 전체 시스템의 지배방정식을 도출한 후, 이 방정식의 해를 구하여 해상풍력발전시스템의 지진응답을 계산한다. 해석 결과로부터 지반-구조물 상호작용은 콘크리트 석션식 지지구조물에 의해 지지된 해상풍력발전시스템의 지진응답을 크게 증가시킬 수 있음을 확인할 수 있다. 특히, 지반의 유연성으로 인해 시스템의 고차 고유모드 응답이 증가할 수 있으므로, 해상풍력발전시스템의 동적거동 산정 시에는 반드시 지반-구조물 상호작용의 효과를 고려하여야 할 것이다.

Nonlinear aerodynamic stability analysis of orthotropic membrane structures with large amplitude

  • Zheng, Zhoulian;Xu, Yunping;Liu, Changjiang;He, Xiaoting;Song, Weiju
    • Structural Engineering and Mechanics
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    • 제37권4호
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    • pp.401-413
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    • 2011
  • The aerodynamic stability of orthotropic tensioned membrane structures with rectangular plane is theoretically studied under the uniform ideal potential flow. The aerodynamic force acting on the membrane surface is determined by the potential flow theory in fluid mechanics and the thin airfoil theory in aerodynamics. Then, based on the large amplitude theory and the D'Alembert's principle, the interaction governing equation of wind-structure is established. Under the circumstances of single mode response, the Bubnov-Galerkin approximate method is applied to transform the complicated interaction equation into a system of second order nonlinear differential equation with constant coefficients. Through judging the stability of the system characteristic equation, the critical divergence instability wind velocity is determined. Finally, from different parametric analysis, we can conclude that it has positive significance to consider the characteristics of orthotropic and large amplitude for preventing the instability destruction of structures.

A new ALE finite element techniques for wind-structure interactions

  • Choi, Chang-Koon;Yu, Won-Jin
    • Wind and Structures
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    • 제3권4호
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    • pp.291-302
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    • 2000
  • A new finite element technique to solve the problem of wind and structure interactions is presented. Conventionally, wind analysis is performed on the Eulerian description in which the finite element mesh would not move in accordance with the wind flow. However, it is not the case in wind-structure interaction problems because nodes attached to the surface of structure should move with the displacement of structure. The arbitrary Lagrangian-Eulerian (ALE) method treats the mesh and flow independently, and allow the mesh to move. In this study, the analysis domain is divided into regions of the structure, air around the structure and the interface of two regions. To satisfy the compatibility and equilibrium conditions between separated regions and to carry out the efficient analysis, the rigid link is used. Also the equation of wind and that of structure are arranged in a single matrix equation.

Influence of soil-structure interaction on seismic responses of offshore wind turbine considering earthquake incident angle

  • Sharmin, Faria;Hussan, Mosaruf;Kim, Dookie;Cho, Sung Gook
    • Earthquakes and Structures
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    • 제13권1호
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    • pp.39-50
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    • 2017
  • Displacement response and corresponding maximum response energy of structures are key parameters to assess the dynamic effect or even more destructive structural damage of the structures. By employing them, this research has compared the structural responses of jacket supported offshore wind turbine (OWT) subjected to seismic excitations apprehending earthquake incidence, when (a) soil-structure interaction (SSI) has been ignored and (b) SSI has been considered. The effect of earthquakes under arbitrary angle of excitation on the OWT has been investigated by means of the energy based wavelet transformation method. Displacement based fragility analysis is then utilized to convey the probability of exceedance of the OWT at different soil site conditions. The results show that the uncertainty arises due to multi-component seismic excitations along with the diminution trend of shear wave velocity of soil and it tends to reduce the efficiency of the OWT to stand against the ground motions.

Optimal design of a wind turbine supporting system accounting for soil-structure interaction

  • Ali I. Karakas;Ayse T. Daloglua
    • Structural Engineering and Mechanics
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    • 제88권3호
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    • pp.273-285
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    • 2023
  • This study examines how the interaction between soil and a wind turbine's supporting system affects the optimal design. The supporting system resting on an elastic soil foundation consists of a steel conical tower and a concrete circular raft foundation, and it is subjected to wind loads. The material cost of the supporting system is aimed to be minimized employing various metaheuristic optimization algorithms including teaching-learning based optimization (TLBO). To include the influence of the soil in the optimization process, modified Vlasov and Gazetas elastic soil models are integrated into the optimization algorithms using the application programing interface (API) feature of the structural analysis program providing two-way data flow. As far as the optimal designs are considered, the best minimum cost design is achieved for the TLBO algorithm, and the modified Vlasov model makes the design economical compared with the simple Gazetas and infinitely rigid soil models. Especially, the optimum design dimensions of the raft foundation extremely reduce when the Vlasov realistic soil reactions are included in the optimum analysis. Additionally, as the designated design wind speed is decreased, the beneficial impact of soil interaction on the optimum material cost diminishes.