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Experimental study on dynamic response of a floating offshore wind turbine under various freak wave profiles
Abstract This study performed experimental investigation on the dynamic response of an in-place floating offshore wind turbine (FOWT) under freak wave actions. Based on the method of wave profile modulation, various freak wave profiles embedded in unidirectional Gaussian seas were generated in wave basin and the action of these waves on the FOWT was measured and analyzed, which has not been done before. The motions of FOWT were analyzed in time domain as well as time-frequency domain. The effect of freak wave parameters on FOWT motions was addressed, i.e., freak wave height, freak wave period, large crest, and deep trough. The dynamic response of FOWT was observed as a spike at the occurrence of freak wave in a conventional random wave, where the impact of freak wave can last for 17 spectral peak periods of wave. Data analysis shows that the motions of FOWT increased linearly with the freak wave height. In addition, the occurrence of freak wave induced the coupled effect on surge and pith, which was strengthen with the increase of freak wave height and wave period. Compared to a large crest, a deep trough of freak wave led to stronger motions and was supposed to be a key concern on the safety of the FOWT. The novel findings in this study provided a reference for the design of survival load on a FOWT and benchmarks for validating numerical models.
Highlights The dynamic response of a semi-submersible FOWT are investigated under the impact of various profiles of freak wave embedded in Gaussian seas. The freak wave motivated the coupled effect between surge and pitch during occurrence of freak wave. The dynamic response caused by freak waves can last for up to 17 wave periods. The freak waves with deep trough can lead to stronger FOWT motions, which significantly impact the power output of turbine and should be a primarily concern.
Experimental study on dynamic response of a floating offshore wind turbine under various freak wave profiles
Abstract This study performed experimental investigation on the dynamic response of an in-place floating offshore wind turbine (FOWT) under freak wave actions. Based on the method of wave profile modulation, various freak wave profiles embedded in unidirectional Gaussian seas were generated in wave basin and the action of these waves on the FOWT was measured and analyzed, which has not been done before. The motions of FOWT were analyzed in time domain as well as time-frequency domain. The effect of freak wave parameters on FOWT motions was addressed, i.e., freak wave height, freak wave period, large crest, and deep trough. The dynamic response of FOWT was observed as a spike at the occurrence of freak wave in a conventional random wave, where the impact of freak wave can last for 17 spectral peak periods of wave. Data analysis shows that the motions of FOWT increased linearly with the freak wave height. In addition, the occurrence of freak wave induced the coupled effect on surge and pith, which was strengthen with the increase of freak wave height and wave period. Compared to a large crest, a deep trough of freak wave led to stronger motions and was supposed to be a key concern on the safety of the FOWT. The novel findings in this study provided a reference for the design of survival load on a FOWT and benchmarks for validating numerical models.
Highlights The dynamic response of a semi-submersible FOWT are investigated under the impact of various profiles of freak wave embedded in Gaussian seas. The freak wave motivated the coupled effect between surge and pitch during occurrence of freak wave. The dynamic response caused by freak waves can last for up to 17 wave periods. The freak waves with deep trough can lead to stronger FOWT motions, which significantly impact the power output of turbine and should be a primarily concern.
Experimental study on dynamic response of a floating offshore wind turbine under various freak wave profiles
Zeng, Fanxu (author) / Zhang, Ningchuan (author) / PhD Huang, Guoxing (author) / Gu, Qian (author) / He, Meng (author)
Marine Structures ; 88
2022-11-30
Article (Journal)
Electronic Resource
English
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