Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines

Author:

Lai Yongqing1,Li Wei1,He Ben1,Xiong Gen1,Xi Renqiang23ORCID,Wang Piguang3

Affiliation:

1. Key Laboratory for Far-Shore Wind Power Technology of Zhejiang Province, PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, China

2. School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, China

3. The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

Abstract

At present, monopile-supported offshore wind turbines (MOWTs) are widely used in offshore wind farms. The influence of blade flexibility on the dynamic behaviors of MOWTs excited by waves and earthquakes was investigated in this study. Numerical analysis models were established for 5 MW and 10 MW MOWTs, incorporating flexible and rigid blade configurations. The modes and natural frequencies of the full system were compared between these two numerical models, and their dynamic responses were evaluated under wave-only and earthquake-only excitations. It was revealed that the influence of blade flexibility on the first- and second-order modes of the system can be neglected. The dynamic response of these MOWTs under wave excitation can be predicted by the rigid blade model, where the maximum relative difference is less than 5%. However, higher-order modes of the system are significantly affected by the blade flexibility. Under high-frequency excitations, these higher-order modes of the system are remarkably stimulated. Additionally, a large relative difference, exceeding 50%, is detected when the rigid blade model is used to predict the seismic response of the two MOWTs. Consequently, the blade flexibility should be adequately modeled when predicting the dynamic response of OWTs.

Funder

China Postdoctoral Science Foundation

Zhejiang Provincial Natural Science Foundation of China

National Natural Science Foundation of China

Postdoctoral Science Preferential Funding of Zhejiang Province

Publisher

MDPI AG

Subject

Ocean Engineering,Water Science and Technology,Civil and Structural Engineering

Reference49 articles.

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