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Key Design Parameters to Identify Natural Frequency of Tripod Substructures for Offshore Wind Turbine

[+] Author Affiliations
Jian-hua Zhang, Cheng-yu Guan, Jia-yue Lin, Ke Sun

Harbin Engineering University, Harbin, China

Paper No. OMAE2017-62511, pp. V03BT02A015; 8 pages
doi:10.1115/OMAE2017-62511
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3B: Structures, Safety and Reliability
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5766-3
  • Copyright © 2017 by ASME

abstract

Natural frequencies of the tripod are generally taken as the primary indicators of dynamic response, and pile soil interaction (PSI) will affect the natural frequency. To simulate PSI behaviour, P-Y method and simplified method are compared in a case study of tripod of 3 MW OWT in China to define the applicable clamped length in simplified method, the results demonstrate that 6 times of anchor pile diameter is suitable for simulating frequency of the tripod in the specific location. The effects of geometries and material properties of tripod on natural frequency are investigated using random finite element method considering uncertainties in the design variables and materials. It highlights a reasonable engineering judgment and understanding for structural design of tripod foundation and develops a more effective approach to regulate the design once the structures cannot meet the requirement in preliminary design.

Copyright © 2017 by ASME

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