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Effect of the transition piece on the natural frequencies of monopile-supported offshore wind turbines.

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Title: Effect of the transition piece on the natural frequencies of monopile-supported offshore wind turbines.
Authors: Niu, Hengkai1 (AUTHOR) 15030084237@163.com, Shan, Zhendong1 (AUTHOR) shanzhendong@gmail.com, Tang, Lvjun2 (AUTHOR) tljzjdx@126.com, Wang, Ziquan1 (AUTHOR) 18145649201@163.com
Source: Soil Dynamics & Earthquake Engineering (0267-7261). Dec2024, Vol. 187, pN.PAG-N.PAG. 1p.
Subjects: Timoshenko beam theory, Wind turbines, Shear waves, Transfer matrix, Analytical solutions
Abstract: The lateral natural frequency of an offshore wind turbine (OWT) is a crucial factor to consider in the design of OWT foundations. Eighty percent of currently installed OWTs are mounted on monopile foundations, which are connected to the superstructure via a transition piece (TP). To explore the differences in natural frequencies between grouted connection (GC) and TP-less designs, this study incorporates a transition piece into the calculation model of the OWT system. Based on the Timoshenko beam theory and transfer matrix method, the characteristic equations of the lateral natural frequency of the OWT are derived. The study found that the effect of the transition piece on the natural frequency is strongly influenced by the OWT type and the soil stiffness, and the influence of transition piece on different order natural frequencies is different for the same OWT. For the NREL offshore 5-MW baseline wind turbine, the TP-less model reduces the first natural frequency of the OWT by 1.31 % and elevates the second and third natural frequencies by 11.88 % and 2.72 %, respectively, compared to the GC model. The increase in soil shear wave velocity amplifies the influence of the transition piece on the first and third natural frequencies, while weakening its influence on the second natural frequency. • Timoshenko beam model is used to simulate the vibration of OWTs. • Variable cross-section characteristics of OWTs are considered. • The effect of transition piece on the natural frequency of OWTs is studied. • Effect of shear wave velocity of the soil on the natural frequencies. [ABSTRACT FROM AUTHOR]
Copyright of Soil Dynamics & Earthquake Engineering (0267-7261) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 180364470
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PubTypeId: academicJournal
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  Data: Effect of the transition piece on the natural frequencies of monopile-supported offshore wind turbines.
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  Data: The lateral natural frequency of an offshore wind turbine (OWT) is a crucial factor to consider in the design of OWT foundations. Eighty percent of currently installed OWTs are mounted on monopile foundations, which are connected to the superstructure via a transition piece (TP). To explore the differences in natural frequencies between grouted connection (GC) and TP-less designs, this study incorporates a transition piece into the calculation model of the OWT system. Based on the Timoshenko beam theory and transfer matrix method, the characteristic equations of the lateral natural frequency of the OWT are derived. The study found that the effect of the transition piece on the natural frequency is strongly influenced by the OWT type and the soil stiffness, and the influence of transition piece on different order natural frequencies is different for the same OWT. For the NREL offshore 5-MW baseline wind turbine, the TP-less model reduces the first natural frequency of the OWT by 1.31 % and elevates the second and third natural frequencies by 11.88 % and 2.72 %, respectively, compared to the GC model. The increase in soil shear wave velocity amplifies the influence of the transition piece on the first and third natural frequencies, while weakening its influence on the second natural frequency. • Timoshenko beam model is used to simulate the vibration of OWTs. • Variable cross-section characteristics of OWTs are considered. • The effect of transition piece on the natural frequency of OWTs is studied. • Effect of shear wave velocity of the soil on the natural frequencies. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Soil Dynamics & Earthquake Engineering (0267-7261) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.soildyn.2024.108982
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
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      – SubjectFull: Timoshenko beam theory
        Type: general
      – SubjectFull: Wind turbines
        Type: general
      – SubjectFull: Shear waves
        Type: general
      – SubjectFull: Transfer matrix
        Type: general
      – SubjectFull: Analytical solutions
        Type: general
    Titles:
      – TitleFull: Effect of the transition piece on the natural frequencies of monopile-supported offshore wind turbines.
        Type: main
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            NameFull: Niu, Hengkai
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            NameFull: Shan, Zhendong
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            NameFull: Tang, Lvjun
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            NameFull: Wang, Ziquan
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            – D: 01
              M: 12
              Text: Dec2024
              Type: published
              Y: 2024
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