LIFE EXTENSION ASSESSMENT OF WIND TURBINE BLADES UNDER CUMULATIVE DAMAGE CONDITIONS

Zeng Shilong; Ma Qiang; Li Dewang; Bai Xuezong; An Zongwen

doi:10.19912/j.0254-0096.tynxb.2024-0640

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (8) : 114-119. DOI: 10.19912/j.0254-0096.tynxb.2024-0640

LIFE EXTENSION ASSESSMENT OF WIND TURBINE BLADES UNDER CUMULATIVE DAMAGE CONDITIONS

Zeng Shilong^1,2, Ma Qiang¹, Li Dewang¹, Bai Xuezong¹, An Zongwen¹

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Abstract

Focusing on the standard system and running requirements related to the wind turbine blades, a method for life extension assessment of wind turbine blades is proposed under cumulative damage conditions. Firstly, measurements are taken of the bending moment loads at the blade root in both the flap-wise and edge-wise directions in-service conditions. Then the wind speed and turbulence intensity experienced by the blade are obtained to establish a capture matrix. Subsequently, the cumulative damage calculation is performed by combining the rainfall counting method, equivalent load transformation and the Miner criterion. The Rayleigh distribution is employed to build the fatigue load spectrum. Next, the annual damage value is calculated based on the cumulative damage and the years of service life. The determination of the life extension span is based on the premise that the cumulative total damage does not surpass the critical damage threshold for fatigue failure. Finally, the life extension assessment is carried out with a 1.5 MW blade as an example to verify the feasibility of the method.

Key words

wind turbine blades / cumulative damage / bending moment load / wind speed / life extension

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Zeng Shilong, Ma Qiang, Li Dewang, Bai Xuezong, An Zongwen. LIFE EXTENSION ASSESSMENT OF WIND TURBINE BLADES UNDER CUMULATIVE DAMAGE CONDITIONS[J]. Acta Energiae Solaris Sinica. 2025, 46(8): 114-119 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0640

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