FATIGUE CALCULATION OF BLADE ROOT BOLTS FOR WIND TURBINES CONSIDERING PITCH ANGLE

Liu Zhao; Zhang Yunfei

doi:10.19912/j.0254-0096.tynxb.2024-0780

PDF(5899 KB)

Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 574-580. DOI: 10.19912/j.0254-0096.tynxb.2024-0780

FATIGUE CALCULATION OF BLADE ROOT BOLTS FOR WIND TURBINES CONSIDERING PITCH ANGLE

Liu Zhao¹, Zhang Yunfei²

Author information +

History +

Abstract

In the design of large wind turbines with variable speed pitch control strategy, due to the effect of pitch and the differences in the load bearing characteristics of the bolts at different pitch angle positions, it is necessary to take into account the magnitude and the direction of the overturning moment of the blade root, and the pitch angle in the fatigue calculation of the blade root bolts. This paper introduces a three-dimensional interpolation method of stresses with load magnitude, direction and pitch angle as input variables to realize more accurate fatigue calculation of blade root bolts without increasing the amount of finite element calculation. Taking a manufacturer’s design as an example, the relationship between the blade root loads and the simplification of the calculation have been discussed. Finite element method was used for the bolt stress analysis. On the basis of FEM results, the three-dimensional stress interpolation and fatigue cumulative damage calculation of the bolt have been completed.

Key words

wind turbine / bolted joint / nonlinear analysis / fatigue analysis

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Liu Zhao, Zhang Yunfei. FATIGUE CALCULATION OF BLADE ROOT BOLTS FOR WIND TURBINES CONSIDERING PITCH ANGLE[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 574-580 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0780

References

[1] IEC 61400 Part 1: Wind turbines-design requirements third edition2005-08[S].
[2] ZHENG T S, CHEN N Z, YUAN L.Structural strength assessment for thin-walled blade root joint of floating offshore wind turbine (FOWT)[J]. Thin-walled structures, 2023, 191: 111057.
[3] ZHENG T S, CHEN N Z.Time-domain fatigue assessment for blade root bolts of floating offshore wind turbine (FOWT)[J]. Ocean engineering, 2022, 262: 112201.
[4] 刘兆, 周慧珠. 直驱风电机组中发电机与机架螺栓连接的优化设计[J]. 机械设计, 2023, 40(2): 118-125.
LIU ZH, ZHOU H Z.Optimization design of bolted joint between generator and mainframe in direct-drive wind turbines[J]. Journal of machine design, 2023, 40(2): 118-125.
[5] 刘兆, 周慧珠. 风力发电机组塔架螺栓连接公差问题研究[J]. 太阳能学报, 2022, 43(2): 408-414.
LIU Z, ZHOU H Z.Study on tolerance of bolt connection of wind turbine tower[J]. Acta energiae solaris sinica, 2022, 43(2): 408-414.
[6] CHEN G C, WANG C Z, XIAO Z M.Effects of supporting structure and bolt connection on the fatigue life and carrying capacity of a slewing bearing[J]. Proceedings of the institution of mechanical engineers, part J: journal of engineering tribology, 2017, 231(6): 766-782.
[7] DONG Z Y, ZHANG H L. Study on finite element model of bolt strength in blade root[J]. Applied mechanics and materials, 2013, 427/428/429: 221-224.
[8] 张荣, 何玉林, 牛兴海, 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(23): 112-114, 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(23): 112-114, 121.
[9] 陈严, 田鹏, 刘雄, 等. 水平轴风力机轮毂强度分析方法研究[J]. 太阳能学报, 2010, 31(7): 912-916.
CHEN Y, TIAN P, LIU X, et al.Research on strength calculation methods of rotor hub of HAWTs[J]. Acta energiae solaris sinica, 2010, 31(7): 912-916.
[10] BUCHER C, EBERT M.Load carrying behavior of prestressed bolted steel flanges considering random geometrical imperfections[C]//8th ASCE Specialty Conference on Probabilistic And Structural Reliability. University of Notre Dame, USA, 2000.
[11] LOCHAN S, MEHMANPARAST A, WINTLE J.A review of fatigue performance of bolted connections in offshore wind turbines[J]. Procedia structural integrity, 2019, 17: 276-283.
[12] 刘胜祥, 宋晓萍, 曾毅, 等. 随机载荷作用下的风力机高强度螺栓疲劳特性分析[J]. 太阳能学报, 2013, 34(2): 201-206.
LIU S X, SONG X P, ZENG Y, et al.Fatigue properties analysis of high strength bolts of wind turbine under random loads[J]. Acta energiae solaris sinica, 2013, 34(2): 201-206.
[13] 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.