Method for calculating fatigue test loads of large-scale wind turbine blades considering pre-bending and geometric nonlinearity.
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| Title: | Method for calculating fatigue test loads of large-scale wind turbine blades considering pre-bending and geometric nonlinearity. |
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| Authors: | Zhang, Lifang1 (AUTHOR), Ma, Qiang1 (AUTHOR), Bai, Xuezong1 (AUTHOR), Hou, Yunfeng1 (AUTHOR) houyf@lut.edu.cn, An, Zongwen1 (AUTHOR) anzongwen@163.com, Zhang, Wenwei2 (AUTHOR), Wang, Bowen2 (AUTHOR), Deng, Hang2 (AUTHOR), Zhao, Jiangang2 (AUTHOR) |
| Source: | Wind Engineering. Jun2026, Vol. 50 Issue 3, p536-562. 27p. |
| Subjects: | Wind turbine blades, Nonlinear theories, Dynamic loads, Single-degree-of-freedom systems, Deformations (Mechanics), Strains & stresses (Mechanics), Static equilibrium (Physics), Fatigue testing machines |
| Abstract: | The increasing size of wind turbine blades has intensified the influence of pre-bending and geometric nonlinearity in fatigue testing, where traditional methods neglect their coupling effects and lead to significant load calculation deviations. This study develops a calculation method that considers both the static deformation caused by pre-bending and the softening effect induced by geometric nonlinearity. The method establishes a multi-degree-of-freedom system model and determines test loads through combined static equilibrium and dynamic response analyses. Validation with a 90-meter blade shows that the method reduces the first flapwise natural frequency calculation error from 6.1% to 0.3%, and achieves high accuracy in predicting test bending moments with errors within ±2% in the highly loaded root region (0-40% span). The method also reveals the variation of stress ratios from −6 at the root to −1 near the tip, capturing the asymmetric loading characteristics in actual testing conditions. These findings establish a theoretical basis for fatigue testing of large-scale wind turbine blades and improve testing efficiency by reducing empirical adjustments. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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