Model tests on large-diameter monopile-supported offshore wind turbine in sand

ZHANG Chen-rong; TIAN Shu-ping; ZHANG Ji-meng

doi:10.11779/CJGE2022S2004

Volume 44 Issue S2

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Chinese Journal of Geotechnical Engineering > 2022 > 44(S2): 16-19. > DOI: 10.11779/CJGE2022S2004

ZHANG Chen-rong, TIAN Shu-ping, ZHANG Ji-meng. Model tests on large-diameter monopile-supported offshore wind turbine in sand[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S2): 16-19. DOI: 10.11779/CJGE2022S2004

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Model tests on large-diameter monopile-supported offshore wind turbine in sand

ZHANG Chen-rong^{1, 2,},
TIAN Shu-ping^{1, 2},
ZHANG Ji-meng^{1, 2}

1.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

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Received Date: December 05, 2022
Available Online: March 26, 2023

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Abstract

Abstract

Using the motor servo random dynamic loading equipment, a series of 1g model tests are carried out to investigate the dynamic response characteristics of the monopile-supported wind turbine model in sand under storm conditions. The experimental results indicate that the extreme displacement response of the blade-coupled model is about 4%~8% smaller than the lumped model. The lumped model contains a single resonance peak corresponding to 5 Hz. However, the blade-coupled model contains two natural frequency resonance peaks 4Hz and 6Hz, which are corresponding to the natural frequencies of the tower and the blade-tower coupling respectively. With the increase of the average wind speed under storm conditions, the extreme displacement response shows a non-linear growth trend. For the bottom-fixed model, the extreme displacement response of the tower tip is about 45% lower, and the natural frequency is about 11% higher compared with the monopile foundation model. For the wind spectrum with higher energy level and more high-frequency distribution, the corresponding extreme dynamic response and the energy level in the frequency domain are higher.
- offshore wind turbine,
- large-diameter monopile,
- dynamic response,
- 1g model test

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References

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