DIC EXPERIMENT AND ANALYSIS OF INFLUENCE FACTORS ON LOAD DISTRIBUTION OF WIND TURBINE SPIRALOCK THREAD PAIR

Wang Licheng; Liu Yu; Yao Yudong; Ai Yanting

doi:10.19912/j.0254-0096.tynxb.2024-0702

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 17-25. DOI: 10.19912/j.0254-0096.tynxb.2024-0702

DIC EXPERIMENT AND ANALYSIS OF INFLUENCE FACTORS ON LOAD DISTRIBUTION OF WIND TURBINE SPIRALOCK THREAD PAIR

Wang Licheng¹, Liu Yu¹, Yao Yudong², Ai Yanting¹

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Abstract

An experimental method based on digital image correlation （DIC） for load distribution of Spiralock thread pairs is proposed, and the method is applied to study the load distribution of standard threaded pairs and Spiralock thread pairs. A 2D finite element model is developed based on the geometrical characteristics of the Spiralock thread pair and the accuracy is validated by the experimental results. Finally, the influence of thread wedge angle, pitch and modulus of elasticity on the load distribution of the Spiralock thread pair is analyzed. The results show that the DIC experimental method can identify the load distribution characteristics of Spiralock thread pair and verify the effect of Spiralock thread pair from the experimental perspective. The maximum error between the standard threaded pair experimental load ratio values and the analytical method is only 4.82%. The maximum error between the results of the experiment load distribution of the Spiralock thread pair and the results of the finite element model is 5.23%. The most uniform loading is achieved with a wedge angle of 30°. The axis load has little effect on the load carrying ratio. Load uniformity is inversely proportional to the pitch and directly proportional to the elastic modulus ratio of the bolt to the nut.

Key words

wind turbines / Spiralock thread / digital image correlation / load distribution / influencing factors

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Wang Licheng, Liu Yu, Yao Yudong, Ai Yanting. DIC EXPERIMENT AND ANALYSIS OF INFLUENCE FACTORS ON LOAD DISTRIBUTION OF WIND TURBINE SPIRALOCK THREAD PAIR[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 17-25 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0702

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