Bi-directional response mitigation of offshore wind turbines under multiple hazards
Misaligned wind-wave and seismic loading render offshore wind turbines suffering from excessive bidirectional vibration.However,most of existing research in this field focused on unidirectional vibration mitigation,which is inadequate for research and real application.The present study proposes a three dimensional pendulum tuned mass damper(3d-PTMD)to mitigate the nacelle structural response in the fore-aft and side-side directions.An analytical model of the offshore wind turbine coupled with a 3d-PTMD is established wherein the interaction between the blades and the tower is modelled.Aerodynamic loading is computed using the Blade Element Momentum(BEM)method where the Prandtls tip loss factor and the Glauert correction are considered.JONSWAP spectrum is adopted to generate wave data.Wave loading is computed using Morison equation in collaboration with the strip theory.Performance of the 3d-PTMD is examined on a National Renewable Energy Lab(NREL)monopile 5 MW baseline wind turbine under misaligned wind-wave and seismic loading.Dual linear TMDs are used for comparison.It is found that the 3d-PTMD outperforms the dual TMDs in controlling the bi-directional response under misaligned wind-wave and seismic loadings.In addition,the 3d-PTMD experiences a smaller stroke than the linear TMD,which is beneficial for practical application.
Offshore wind turbines bi-directional response mitigation wind-wave misalignment three dimensional pendulum damper
C.Sun V.Jahangiri H.Sun;
Department of Civil and Environmental Engineering,Louisiana State University,Baton Rouge 70803,USA Xian Research Institute Co.,Ltd.of China Coal Technology & Engineering Group,Xian,710077,China
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
601-610
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）