Based on the standard IEC 61400, the taper and flatness tolerances of the flange of wind turbine tower are studied. Considering the tolerance type and distribution, the stresses of flange wall and bolt are calculated with FE method. Taking on actual wind turbine as example, the stresses of bolts and flanges with different tolerances are calculated. The results show that the standard IEC 61400-6 and GL's tolerance requirements cannot fulfill the safety of the tower flanges. The effects on flange bolt of 4 flatness tolerance types are compared, and the formula to calculate the tower wall's stress under flange taper has been made and explained, which provides a more rigorous design method for improving the reliability of tower flange connection.
Key words
wind turbine /
tower /
bolts /
finite element method /
flange tolerance
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] IEC 61400-1, Wind turbines-Part 1: Design requirements 005-08[S].
[2] BUCHER C, EBERT M.Load carrying behavior of prestressed bolted steel flanges considering random geometrical imperfections[C]//8th ASCE Specialty Conference on Probabilistic Mechanics and Structural Reliability, USA, 2000.
[3] 陈真, 杜静, 何玉林, 等. 采用VDI2230的风力发电机组塔筒法兰联接处螺栓强度分析[J]. 现代制造工程, 2011(5): 125-129.
CHEN Z, DU J, HE Y L, et al. Strength analysis of bolt joint on wind turbine tower flange based on VDI2230[J]. Modern manufacturing engineering, 2011(5): 125-129.
[4] 张荣, 何玉林, 牛星海, 等. MW级风力发电机塔顶法兰连接系统有限元分析[J]. 制造业自动化, 2012, 34(12): 112-121.
ZHANG R, HE Y L, NIU X H, et al.Finite element analysis of top flanged joint system of MW wind turbine[J]. Manufacturing automation, 2012, 34(12): 112-121.
[5] UMESH K N, BHARATH P, MOHAMED F I.Design and analysis of 2 MW wind turbine tower[J]. International journal of mechanical and production engineering, 2016, 4(10): 13-17.
[6] IEC 61400-6, Wind turbines-Part 6:Tower and foundation design requirements, 2016[S].
[7] Germanischer Lloyd Industrial Services GmbH. Guideline for the certification of wind turbines[M]. Hamburg, Germany: Germanischer Lloyd, 2010: 4-31, 5-10, 7-3, 7-4.
[8] DNV/Risø. Guidelines for design of wind turbines[M]. Denmark: Jydsk Centraltrykkeri, 2002: 164-165.
[9] YOUNG W C, BUDYNAS R G.Roark's rormulas for stress and strain[M]. United States of America: McGraw-Hill, 2002.
PDF(2191 KB)
