FATIGUE STRENGTH ANALYSIS OF WIND POWER SPINDLE CONSIDERING SURFACE TOPOGRAPHY

Huang Jingbo; Long Kai; Cheng Zhengkun; Zhang Jinhua; Zhang Hui

doi:10.19912/j.0254-0096.tynxb.2025-0505

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 621-626. DOI: 10.19912/j.0254-0096.tynxb.2025-0505

FATIGUE STRENGTH ANALYSIS OF WIND POWER SPINDLE CONSIDERING SURFACE TOPOGRAPHY

Huang Jingbo¹, Long Kai¹, Cheng Zhengkun², Zhang Jinhua³, Zhang Hui¹

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Abstract

To investigate the influence of surface topography on fatigue strength, a harmonic superposition method was proposed for reconstructing surface topography, the analytical expressions of stress concentration coefficient and fatigue notch coefficient were derived, and the empirical formula terms were revised in accordance with DNVGL certification. Based on the DNVGL specification and the proposed method, the cumulative fatigue damage distribution of a wind turbine mainshaft was calculated. The results indicate that within certain conditions, the results of the two approaches are congruent. Under the identical Rz, the fatigue damage value decreases as the surface topography wavelength increases, hence proving the imperative for quantitative analysis of fatigue strength based on measured surface topography.

Key words

wind turbines / fatigue strength / surface roughness / surface reconstruction / stress concentration / stress-life curve

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Huang Jingbo, Long Kai, Cheng Zhengkun, Zhang Jinhua, Zhang Hui. FATIGUE STRENGTH ANALYSIS OF WIND POWER SPINDLE CONSIDERING SURFACE TOPOGRAPHY[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 621-626 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0505

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