Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines
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 MO...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-10-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/11/11/2041 |
| _version_ | 1827639603141541888 |
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| author | Yongqing Lai Wei Li Ben He Gen Xiong Renqiang Xi Piguang Wang |
| author_facet | Yongqing Lai Wei Li Ben He Gen Xiong Renqiang Xi Piguang Wang |
| author_sort | Yongqing Lai |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T16:42:38Z |
| format | Article |
| id | doaj.art-fe50d7dd1b2b4e088248a5b98e088291 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-09T16:42:38Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-fe50d7dd1b2b4e088248a5b98e0882912023-11-24T14:50:12ZengMDPI AGJournal of Marine Science and Engineering2077-13122023-10-011111204110.3390/jmse11112041Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind TurbinesYongqing Lai0Wei Li1Ben He2Gen Xiong3Renqiang Xi4Piguang Wang5Key Laboratory for Far-Shore Wind Power Technology of Zhejiang Province, PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, ChinaKey Laboratory for Far-Shore Wind Power Technology of Zhejiang Province, PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, ChinaKey Laboratory for Far-Shore Wind Power Technology of Zhejiang Province, PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, ChinaKey Laboratory for Far-Shore Wind Power Technology of Zhejiang Province, PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, ChinaSchool of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, ChinaThe Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, ChinaAt 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.https://www.mdpi.com/2077-1312/11/11/2041blade flexibilitydynamic characteristicsdynamic responseoffshore wind turbinesFourier amplitude spectra |
| spellingShingle | Yongqing Lai Wei Li Ben He Gen Xiong Renqiang Xi Piguang Wang Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines Journal of Marine Science and Engineering blade flexibility dynamic characteristics dynamic response offshore wind turbines Fourier amplitude spectra |
| title | Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines |
| title_full | Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines |
| title_fullStr | Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines |
| title_full_unstemmed | Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines |
| title_short | Influence of Blade Flexibility on the Dynamic Behaviors of Monopile-Supported Offshore Wind Turbines |
| title_sort | influence of blade flexibility on the dynamic behaviors of monopile supported offshore wind turbines |
| topic | blade flexibility dynamic characteristics dynamic response offshore wind turbines Fourier amplitude spectra |
| url | https://www.mdpi.com/2077-1312/11/11/2041 |
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