湍流风场与地震激励联合作用下的风力机结构动力学响应

Structural dynamic responses of a wind turbine under turbulent wind combined with seismic motion

湍流风场与地震激励是影响风力机安全最主要的客观因素。为分析风力机在湍流风场及地震激励工况下结构动力学响应,以NREL实测数据为湍流风场数据源,结合相干湍流及地震激励,分别研究了多组工况下风轮、塔架和地基的动力学响应。结果表明：湍流风场对叶片载荷、叶尖位移和塔尖载荷影响较大,而地震激励影响可忽略不计;地震激励对地基载荷、地基位移和塔尖位移影响较大,而湍流风场影响可忽略不计;湍流风场与地震激励对塔基载荷均有一定影响,但后者影响更大,二者对风轮推力和功率影响均较大,且处于相同量级;相干湍流与地震激励对塔基载荷和塔尖位移影响相当,可达稳态风的2倍~15倍。

Turbulent wind field and seismic excitation are the leading objective factors affecting the operational safety of a wind turbine.In order to analyze the structural dynamic response of a wind turbine under turbulent wind and seismic motion,NREL measured data were taken as the source of turbulent wind field to combine coherent turbulent and seismic motion,the dynamic response of the rotor,tower and platform of the wind turbine were studied,respectively.The results showed that the turbulent wind has a bigger impact on loads and deflections of blades,and loads at the tower-tip, while the influence of seismic motion can be ignored;the seismic excitation has a larger impact on loads and displacements of platform,and deflection at the tower-tip,while the influence of turbulent wind can be ignored;the turbulent wind and seismic motion both have a certain impact on loads of tower-base,the coherent turbulent and seismic motion have the same impact on loads of tower-base and deflection of tower-tip,their amplitudes can reach 2-15 times of those under stationary wind.