地震作用下海上风机TMD控制

Vibration Control of Offshore Wind Turbines under Earthquakes by Using Tuned Mass Damper

基于叶素动量理论、莫里森方程以及结构动力学基本理论建立了地震、风以及波浪荷载联合作用下的海上风机运动控制方程;依据风机运动控制方程在FAST中添加地震荷载计算模块建立了上述荷载作用下的海上风机整体耦合分析模型;依据整体耦合分析模型得到地震荷载作用下的海上风机动力反应特性。依据地震作用下的海上风机结构反应动力特性确定TMD的布置方案,并对不同TMD控制方案下海上风机结构的动力特性进行了分析。结果表明,TMD方法能够有效地降低机舱位置的加速度反应时程,但由于各位置加速度反应控制频率的差异,TMD并不能全面地降低风机机舱的加速度反应; TMD控制在不同地震波下对风机基础反应的控制效果有显著差异。

The governing equation of motion of offshore wind turbine under the combined action of earthquake,wind and wave loads is firstly derived according to blade element momentum theory,Morison formula and structural dynamics,and then the coupled analysis model of offshore wind turbine structure under the action of above combined load is established by adding seismic module into FAST to analyze the structural dynamic characteristics of wind turbine structure under earthquake.According to the dynamic characteristics of offshore wind turbine under seismic action,the layout schemes of TMD are determined and the dynamic characteristics of offshore wind turbine structure under different TMD schemes are analyzed.The results show that,(a) the TMD can effectively reduce the acceleration response time history at the top of tower,however,due to the difference of acceleration response frequency of each position,the TMD cannot comprehensively reduce the acceleration response of whole tower;and (b) the control effect of TMD on foundation seismic response is significantly different under different seismic excitations.