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Analysis of the Dynamic Behaviour of 10mw Bottom-Fixed Offshore Wind Turbines

Yang, Y, Bashir, M, Li, C, Wang, J and Loughney, S (2018) Analysis of the Dynamic Behaviour of 10mw Bottom-Fixed Offshore Wind Turbines. In: Proceedings of 3rd International Conference of Offshore Renewable-energy (CORE) . pp. 40-47. (3rd International Conference of Offshore Renewable-energy (CORE), 27 August 2018 - 28 August 2018, Glasgow).

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Abstract

This paper presents a comparative study of the dynamic responses of 10 MW offshore wind turbines supported by a monopile and tripod. The baseline tower of the original land-based wind turbine has been scaled to meet the structural strength requirements for application in water depth of 50m. The open source numerical analysis tool, FAST (Fatigue, Aerodynamic, Structural, Turbulent), is used to conduct the fully coupled simulations. The modal analysis of the wind turbines associated with the two types of support structures is performed using a finite element analysis software suite, ABAQUS and the FAST tool. The results show good agreements between the FAST and ABAQUS responses, indicating that FAST can be used to accurately perform dynamic analysis for the 10 MW wind turbine. The Eigen-frequencies of the 1st eigenmodes of the tripod support structure fall within the blade pass frequency (3P) range, resulting in larger fluctuation ranges of the responses compared to the monopile type. The tripod support structure requires further improvements to avoid the structural natural frequencies coinciding with the 3P frequency in operational speed range of the wind turbine. The rotational frequency (1P) contributes significantly to the blade-tip deflections. The edgewise mode has been activated, while the flapwise mode is invisible. The results presented in this study can potentially contribute to the improvements in the design of support structures of large wind turbines.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Engineering
Publisher: ASRANet Ltd
Date Deposited: 11 Jan 2021 13:10
Last Modified: 11 Jan 2021 13:10
URI: https://researchonline.ljmu.ac.uk/id/eprint/13524

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