Proceedings of the 2024 8th International Conference on Civil Architecture and Structural Engineering (ICCASE 2024)

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Differences in Analytical Solutions for Natural Frequencies of Offshore Wind Turbine Among Three Beam Models

Authors
Hengkai Niu1, 2, Ziquan Wang1, 2, Zhendong Shan1, 2, *
1Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, China
2Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Harbin, China
*Corresponding author. Email: shanzhendong@gmail.com
Corresponding Author
Zhendong Shan
Available Online 30 June 2024.
DOI
10.2991/978-94-6463-449-5_52How to use a DOI?
Keywords
Offshore wind turbine; Natural frequency; Timoshenko beam; Transfer matrix method; Additional shear stress; Analytical solution
Abstract

The transverse natural frequency of offshore wind turbines (OWTs) is one of the key factors to be considered in the design of OWTs, and the selection of a reasonable beam theory is crucial for the solution of the natural frequencies of OWTs. However, the additional shear stress caused by axial force is ignored in some literatures when using the Timoshenko beam theory for modeling OWTs. To this end, the transfer matrix method is used in this paper to compare the differences in the natural frequencies of OWTs based on the Euler-Bernoulli beam model, the Timoshenko beam model, and the Timoshenko beam model without considering the additional shear stresses. The results show that: the additional shear stress did not produce significant differences for the OWTs modeled with the Timoshenko beam model, but its physical significance is more reasonable. The natural frequencies of the OWTs are significantly affected by the axial force when the mass of the rotor nacelle assembly (RNA) is small. When the mass of the RNA is large, the OWT natural frequencies solved by the Euler-Bernoulli beam model are quite different from that by Timoshenko beam model.

Copyright
© 2024 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the 2024 8th International Conference on Civil Architecture and Structural Engineering (ICCASE 2024)
Series
Atlantis Highlights in Engineering
Publication Date
30 June 2024
ISBN
978-94-6463-449-5
ISSN
2589-4943
DOI
10.2991/978-94-6463-449-5_52How to use a DOI?
Copyright
© 2024 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - Hengkai Niu
AU  - Ziquan Wang
AU  - Zhendong Shan
PY  - 2024
DA  - 2024/06/30
TI  - Differences in Analytical Solutions for Natural Frequencies of Offshore Wind Turbine Among Three Beam Models
BT  - Proceedings of the 2024 8th International Conference on Civil Architecture and Structural Engineering (ICCASE 2024)
PB  - Atlantis Press
SP  - 536
EP  - 544
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-449-5_52
DO  - 10.2991/978-94-6463-449-5_52
ID  - Niu2024
ER  -