Abstract
This study explores the damping effects of tuned liquid dampers (TLDs) on a monopile offshore wind turbine (OWT). The fluid–solid coupling of ANSYS was used to simulate the damping effect of a TLD on the structures. The environmental conditions refer to the IEC-61400-3 and the Design Load Case (DLC) 1.2 for the annual average environmental conditions and DLC 6.2 for the 50-year regression period, and the extreme environmental conditions were used in the study. The turbulent wind field simulation was performed by TurbSim, and the load of wind waves on structures was generated by FAST, which were all developed by the NREL (National Renewable Energy Laboratory). In addition to wind and waves, the seismic force was also considered. The cylindrical TLD was located above the rotor nacelle assembly (RNA). A TLD has different damping effects when acting under wind, wave, and earthquake loads, respectively. The effect of the TLD regarding motion reduction on the OWT under coupled wind, wave, and seismic loads was studied. This study also designed a simple experiment to verify the correctness of the numerical simulation results. Fatigue analysis shows that multi-layer TLDs can extend the fatigue life (37%) of an OWT. In addition, under extreme environmental load conditions, multi-layer TLDs have a better vibration damping performance than single-layer TLDs. The study demonstrates that multi-layer TLDs can be considered as a vibration reduction damper for OWTs.
Highlights
Coal is the earliest type of fossil fuel used by human beings, it has always a serious air pollution impact
FAST is a computer-aided engineering (CAE) software developed by National Renewable Energy Laboratory (NREL), which is mainly used to simulate the dynamic responses of a wind turbine
Extensive simulation cases were made, and the following conc1lu).sioAnswamerpelefosuimndu.lation was made to valid the readiness of using FAST, and a simple experimental
Summary
Coal is the earliest type of fossil fuel used by human beings, it has always a serious air pollution impact. Taiwan’s imported energy accounted for 98.16% of its total energy usage in 2018 It is urgent for the Taiwanese government to develop and increase its renewable energy percentage. According to the 4C Offshore reported in 2014, the world’s 23-year average wind speed observation found that the Taiwan Strait has accounted for 16 places of the world’s 20 most windy offshore wind farms. For this reason, the Taiwanese government approved the “Thousand Sea and Land Wind Turbines”. In addition to land farm, the offshore wind farm project is expected to be completed in 2025 with a capacity of 3000 MW and 1000 wind turbines will be installed in the near west coast of Taiwan
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