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Open AccessArticle

Influencing Factors of Motion Responses for Large-Diameter Tripod Bucket Foundation

1
National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China
2
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(22), 4957; https://doi.org/10.3390/app9224957
Received: 24 September 2019 / Revised: 8 November 2019 / Accepted: 13 November 2019 / Published: 18 November 2019
Large-diameter multi-bucket foundation is well suited for offshore wind turbines at deeper water than 20 m. Air floating transportation is one of the key technologies for the cost-effective development of bucket foundation. To predict the dynamic behavior of large-diameter tripod bucket foundation (LDTBF) supported by an air cushion and a water plug inside every bucket in waves, three 1/25-scale physical model tests with different bucket spacing were conducted in waves; detailed prototype foundation models were established using a hydrodynamic software MOSES with a draft of 4.0 m, 4.5 m, and 5.0 m and with a water depth of 10.0 m, 11.25 m, and 12.5 m. The numerical and experimental results are consistent for heaving motion, while exhibiting favorable agreement for pitching motion. The results show that the resonant periods for heaving motion increased with increasing draft and water depth. The maximum amplitude for heaving motion first decreased and then increased with the increase of water depth and spacing between the buckets. The maximum amplitude for pitching motion first decreased and then increased with increasing water depth but decreased with increasing spacing between the buckets. The wider the spacing between the bucket foundations, the larger the heave response amplitude operators (RAOs). Simply improving the pitch RAOs by increasing the spacing between bucket foundations is limited and negatively affects motion performance during the transportation of LDTBF. View Full-Text
Keywords: offshore wind turbine; large-diameter tripod bucket foundation; air floating; response amplitude operator; resonant period offshore wind turbine; large-diameter tripod bucket foundation; air floating; response amplitude operator; resonant period
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MDPI and ACS Style

Liu, X.; Zhang, P.; Zhao, M.; Ding, H.; Le, C. Influencing Factors of Motion Responses for Large-Diameter Tripod Bucket Foundation. Appl. Sci. 2019, 9, 4957.

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