풍력에너지저널 (Journal of Wind Energy)

  • 제13권4호
  • /
  • Pages.42-49
  • /
  • 2022
  • /
  • 2093-5099(pISSN)
  • /
  • 2733-9467(eISSN)
한국풍력에너지학회 (Korea Wind Energy Association)
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대형 풍력발전기 블레이드의 볼트체결부 응력감소를 위한 설계연구

Design investigation of the stress reduction of bolted joint connection components in a large wind turbine blade

  • 하광태 (울산대학교 부유식해상풍력학과 ) ;
  • 허준 (울산대학교 부유식해상풍력학과) ;
  • 정재호 (가천대학교 기계공학부)
  • 투고 : 2022.08.11
  • 심사 : 2022.10.25
  • 발행 : 2022.12.30
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초록

Today, the power capacity of a wind turbine and the size of a blade is increasing to capture more wind resources, reduce the number of wind turbines on a wind farm, and reduce the cost of energy. As the blade size becomes larger, attention is being paid to the structural integrity of the blade root connection due to the heavy gravitational load effect and increased aerodynamic loads on the large blade, which could cause catastrophic failure of the blade. Therefore, the secure bolted joint connection of the blade to the hub is very important. In this paper, attention was given to the stress concentration factor (SCF) at the first thread between the M42 bolt and nut. The effect of various design parameters on the stress concentration factor was investigated, which included nut type, nut height, and reduced shank bolt. From a close design investigation of the numerical results, it turned out that the use of a reduced shank bolt resulted in the largest reduction of the stress concentration factor by 40 %, and the round nut type also reduced the SCF by 10 %, which will be beneficial to large wind turbine blades over 100 meters.

키워드

과제정보

본 연구는 산업통상자원부의 재원으로 한국에너지기술평가원의 지원을 받아 수행한 신재생에너지핵심기술사업(20213030020380, "육상풍력운송한계돌파를 위한 70m이상 접착식 분리형 블레이드 개발")의 연구결과임. 본 연구는 2022년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 과제(No. 20203020020030)의 연구결과임. 연구비 지원에 감사를 드립니다.

참고문헌

  1. IRENA, October 2019, Future of Wind: Deplyment, Investment, Technology, Grid Interation, Socio-Economic Asepects, ISBN 978-92-9260-155-3. 
  2. J.F. Manwell et al, 2002, Wind Energy Explained: Theory, Design and Application, John Wiley % Sons. 
  3. R Scherer, V. Martinez, J.A. Mayugo, and J. Cost, Design and Performance of the T-Bolt Connection of Rotor Blades, proceedings of the European Wind Energy Conference, March 1-5, 1999. 
  4. Victor Martinez, Alfredo Guemes, Dani Trias, and Norbert Blanco, Numerical and Experimental Analysis of Stresss and Failure in T-Bolt Joints. Compos. Struct, 2011, 93, 2636-2645 
  5. Dayton Griffin, Blade System Design Studies Volume I-Compostie Technology for Large Wind Turbine Blades, Sandia National Laboratories, USA, July 2002. 
  6. Stephen Nolet, October 2019, NAWEA/WINDTECH 2019, Plenary 4: Large Turbines on Land - "A Blade Maker's View". 
  7. Hong Kwan Kim, Tae Seong Kim, Jang Ho Lee, and Byung Young Moon, "Full Scale Structural Testing of Small Wind Turbine Composite Blade,", Transactions of the Korean Society of Mechanical Engineers A, vol. 35, no. 11, The Korean Society of Mechanical Engineers, pp. 1407-1413, 01-Nov-2011. 
  8. DNV/Riso, Second Edition, 2002, Guidelines for Design of Wind Turbines, Chapter 5. Rotor. 
  9. General Electric Company, October 2016, Rotor Blade Assembly Having A Stiffening Root Insert, US 9464622B2 
  10. Turaj Ashuri, 2012, Beyond Classical Upsacaling: Integrated Aeroservoelastic Design and Optimization of Large Offshore Wind Turbines, Master of Science in Aerospace Engineering, Sharif University of Technology. 
  11. Find Molholt Jensen, Alexander Kling, and John Dalsgaard Sorensen, 2012, Change in failure type when wind turbine blades scale-up, Sandia Wind Turbine Workshop, Bladena BLADE ENABLER. 
  12. James D. Chalupnik, September 1968, Stress concentratios in bolt-thread roots, Experimental Mechanics 8, 398-404. 
  13. Toshimichi Fukuoka, Naoki Yamasaki, Hiroshi Kitagawa, and Minoru Hamada, 1986, Stress Concentration at the Root of a Screw Thread : Effects of Root Radius and Friction Coefficient, Transactions of the Japan Society of Mechanical Engineers Series A, 1986, Volume 52, Issue 481, Pages 2201-2208. 
  14. T. Fukuoka Evaluation of the Method for Lowering Stress Concentration at the Thread Root of Bolted Joints With Modifications of Nut Shape, ASME.(American Society of Mechanical Engineers), J. Pressure Vessel Technol, February, 1997 119(1): 1-9, 
  15. Alexander JE Ashworth Briggs, Zhongyi y Zhang, and Hom N Dhakal, 2014, Study on T-bolt and pin-loaded bearing strengths and damage accumulation in E-glass/epoxy blade applications, Journal of Composite Materials. 49. 
  16. Victor Martinez, Alfredo Guemes, Norbert Blanco, 2001, Josep CostaThree-Dimensional Stress Analysis of the T-Bolt Joint, MAT 2000-0741-C02-01. 
  17. Mathijs Peeters, Gilberto Santo, Joris Degroote, and Wim Van Paepegem, 2017, The Concept of Segmented Wind Turbine Blades: A Review, MDPI, Energies, 10, 1112, Energies 10(8), 1112. 
  18. Kwangtae Ha, Moritz Batge, David Melcher, and Steffen Czichon, Wind Energy Science, May 2020, "Development and feasibility study of segment blade test methodology", 
  19. Smith, M, 2011, ABAQUS/Standard User's Manual, Version 6.14, Dassault Systemes Simulia Corp.