STUDY ON CALCULATION METHOD OF EQUIVALENT DAMPING RATIO BASED ON TRACTION FATIGUE LOADING OF WIND TURBINE BLADES

Zhou Aiguo; Shi Jinlei; Li Jiajun; Zhu Yutian; Dong Tao

doi:10.19912/j.0254-0096.tynxb.2024-0833

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 531-537. DOI: 10.19912/j.0254-0096.tynxb.2024-0833

STUDY ON CALCULATION METHOD OF EQUIVALENT DAMPING RATIO BASED ON TRACTION FATIGUE LOADING OF WIND TURBINE BLADES

Zhou Aiguo, Shi Jinlei, Li Jiajun, Zhu Yutian, Dong Tao

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Abstract

To obtain the equivalent damping ratio of the blade and its variation relationship with the response amplitude without acquiring detailed blade properties, a calculation method for the equivalent damping ratio of the blade based on traction loading is proposed. Based on vibration theory, the response characteristics of the blade under different periodic excitation are analyzed, and the mapping relationship among the equivalent damping ratio, deformation, and steady-state amplitude is constructed. Three large blades are loaded in steps using Tug Fatigue Testing system, and the equivalent damping ratios under various stages of amplitude are calculated, revealing the nearly linear relationship between the blade's equivalent damping ratio and the steady-state amplitude. At the full-load stage, the equivalent damping ratio of the blade reachs 2-3 times that under small amplitudes. Additionally, the calculated results are compared with those obtained from the free decay method, verifying the feasibility and applicability of the method for calculating the blade's equivalent damping ratio based on traction loading.

Key words

wind turbine blade / equivalent damping ratio / traction loading / fatigue testing / dynamic characteristics / vibration theory

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Zhou Aiguo, Shi Jinlei, Li Jiajun, Zhu Yutian, Dong Tao. STUDY ON CALCULATION METHOD OF EQUIVALENT DAMPING RATIO BASED ON TRACTION FATIGUE LOADING OF WIND TURBINE BLADES[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 531-537 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0833

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