• Title/Summary/Keyword: 복합재 풍력터빈 날개

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Aerodynamic and Structural Design for Medium Scale Horizontal Axis Wind Turbine Rotor Blade with Composite Material (복합재를 이용한 수평축 풍력터빈 회전날개의 공력 및 구조설계에 관한 연구)

  • 공창덕;김기범;오동우;방조혁;김학봉;김종식;유지윤
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 1997.11a
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    • pp.22-22
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    • 1997
  • 무공해 에너지원은 화석에너지의 고갈과 환경오염의 심각한 문제로 인하여 절실히 요구되고 있는 실정이다. 그중 풍력발전 시스템은 타 에너지원에 비해 여러 가지 측면에서 유리한 점을 가치고 있다. 본 연구에서는 500Kw급 풍력발전 시스템을 개발함에 있어, 적합한 공력 성능 및 구조성능을 가지는 회전날개 설계과정을 수행하였다. 공력설계는 운용지역의 풍황을 고려하여 회전날개의 외형을 결정하였고 이를 바탕으로 공력성능해석이 수행되었으며, 구조설계는 복합재료를 사용하여 쉘-스파 구조를 갖도록 설계하여 굽힘 및 비틀림 그리고 피로수명에 대한 구조해석이 수행되었다. 그 결과 4m/s의 미풍에서도 운용가능하며, 12m/s에서는 정격출력 550Kw를 생산할 수 있는 형상이 설계되었고, 또한 20년 이상의 피로수명이 확보되었으며, 공질 등의 동적인 문제도 발생하지 않음을 확인하였다.

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Stress Analysis of Composite Rotor Blade with Sandwich Structure for Medium Class HAWT (좌굴 및 비선형성을 고려한 중형 수평축 풍력터빈용 샌드위치 복합재 회전날개의 설계 개선에 관한 연구)

  • 공창덕;오동우;방조혁
    • Journal of the Korean Society of Propulsion Engineers
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    • v.2 no.3
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    • pp.1-9
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    • 1998
  • The exhaustion of fossil fuels and serious environmental pollution put the concern about non-po llution energy into the world. On the developments of technology, wind energy has been spotlighted as a non-pollution energy in many countries. This study has carried out the aerodynamic and structural design procedure of the lightweight composite rotor blades with an appropriate aerodynamic performance and structural strength for the 500㎾ medium class wind turbine system. The previous design, which is shell-spar structure, is redesigned to shell-spar- sandwich structure for light weight. Large deformation problem from light weight is examined by non-linear analysis. Local buckling occurred under lower stress than failure stress. The buckling analysis is accomplished to confirm the safety of the composite blade. The stress analysis around pin hole joint part at hub is carried out and it is confirmed that the pin hole is not failed. The results show that the resonance of redesigned blade does not happen in operation range.

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Structural Analysis of Wind Turbine Blades Considering the Bi-modulus Property of Carbon Fiber Composites (탄소섬유 복합재의 Bi-modulus 특성을 반영한 풍력 터빈 블레이드 구조해석)

  • Geunsu Joo;Jin Bum Moon;Si-Hyun Kim;Min-Gyu Kang;Ji-Hoon Kim
    • Journal of Wind Energy
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    • v.13 no.3
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    • pp.53-60
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    • 2022
  • This paper deals with the structural analysis of wind turbine blades considering the bi-modulus property of CFRP, known as a more economic and efficient material for very large blades. The bi-modulus property is an unique characteristic of CFRP that shows higher tensile modulus than compressive modulus. Due to this characteristic, it is needed to apply the bi-modulus property to the computational analysis of CFRP blades to achieve more accurate results. In this paper, a novel method is proposed to apply the bi-modulus property of CFRP in a numerical simulation. To demonstrate the bi-modulus effect in FE analysis, the actual bi-modulus of CFRP was measured and applied to the structural analysis of a wind turbine blade. Moreover, the effects of the proposed method were evaluated by comparing the analysis results with actual full-scale blade static test results. As a result, it was verified that the proposed method could appropriately simulate the bi-modulus during FE analysis. Moreover, the accuracy of blade structural analysis was improved in accordance with the application of the bi-modulus property.

Structural Design and Experimental Investigation of A Medium Scale Composite Wind Turbine Blade Considering Fatigue Life (피로 수명을 고려한 중형 복합재 풍력터빈 블레이드의 구조설계 및 실험 평가)

  • Gong, Chang Deok;Bang, Jo Hyeok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.31 no.3
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    • pp.23-30
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    • 2003
  • In this study, the various load cases by specified by the IEC61400-1 international specification and GL Regulations for the wind energy conversion system were considered, and a specific composite structure configuration which can effectively endure various loads was proposed. In order to evaluate the structure, the structural analysis for the composite wind turbine blade was performed using the finite element method(FEM). In the structural design, the acceptable configuration of blade structure was determined through the parametric studies, and the most dominant design parameters were confirmed. In the stress analysis using the FEM, it was confirmed that the blade structure was safe and stable for all the considerd load cases. Moreover the safety of the blade root joint with insert bolts, newly devised in this study, was checked against the design loads and also the fatigue loads. The fatigue life for operating more than 20 years was estimated by using the well-known S-N linear damage rule, the load spectrum and Spera's empirical equations. The full-scale static test was performed under the simulated aerodynamic loads. from the experimental results, it was found that the designed blade had the structural integrity. Furthermore the measured results were agreed with the analytical results such as deflections, strains, the mass and the radial center of gravity. The studied blade was successfully certified by an international institute, GL, of Germany.

Aerodynamic and Structural Design for Medium Size Horizontal Axis Wind Turbine Rotor Blade with Composite Material (복합재를 이용한 수평축 풍력터빈 회전 날개의 공력 및 구조설계에 관한 연구)

  • 공창덕;방조혁;오동우;김기범;김학봉
    • Journal of the Korean Society of Propulsion Engineers
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    • v.1 no.2
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    • pp.12-21
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    • 1997
  • Nowadays, non-pollution energy sources have been strongly needed because of the exhaustion of fossil fuels and serious environmental problems. Because wind energy can be enormously obtained from natural atmosphere, this type of energy has lots of advantages in a economic and pollution point of view. This study has established the aerodynamic and structural design procedure of the rotor blade with an appropriate aerodynamic performance and structural strength for the 500㎾ medium class wind turbine system. The aerodynamic configuration of the rotor blade was determined by considering the wind condition in the typical local operation region, and based on this configuration aerodynamic performance analysis was performed. The rotor blade has the shell-spar structure based on glass/epoxy composite material and is composed of shank including metal joint parts and blade. Structural design was done by the developed design program in this study and structural analysis, for instance stress analysis, mode analysis and fatigue life estimation, was performed by the finite element method. As a result, a medium scale wind turbine rotor blade with starting characteristics of 4m/s wind speed, rated power of 500㎾ at 12m/s wind speed and over 20 years fatigue life has been designed.

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Design Improvement on Wind Turbine Blade of Medium Scale HAWT by Considering IEC 1400-1 Specification (IEC1400-1 규격을 고려한 중형 수평축 풍력발전용 회전날개의 설계개선 연구)

  • 공창덕;정석훈;장병섭;방조혁
    • Journal of the Korean Society of Propulsion Engineers
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    • v.4 no.3
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    • pp.29-37
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    • 2000
  • Because the previous design procedure for the composite wind turbine blade structure using trial and error method takes long time, a improved design procedure by using the program based on classical laminate theory was proposed to reduce the inefficient element. According to the improved design procedure, limitation of strains, stresses and displacements specified by international standard specification IEC1400-1 for the composite wind turbine blade were applied to sizing the structural configuration by using the rule of mixture and the principal stress design technique with a simplified turbine blade. Structural safety for strength and buckling stability was confirmed by the developed analysis program based on the laminate theory to minimize the design procedure. After modifying the preliminary design result with additional structural components such as skin, foam sandwich and mounting joints, stresses, strains, displacements, natural frequency, buckling load and fatigue life were analyzed by the finite element method. Finally these results were confirmed by comparing with IEC1400-1 specification.

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