极限环境载荷诱导风力机结构振动影响分析

ANALYSIS OF VIBRATION INFLUENCE OF WIND TURBINE STRUCTURE INDUCED BY ULTIMATE ENVIRONMENTAL LOAD

风力机桩基、塔架及连接部件构成的支撑结构属顶部承担较大质量的力学结构,地震对其造成的影响远大于常规建筑。针对上述问题,基于NREL开发计算平台,联合TurbSim、AeroDyn、FAST及Seismic,对变风载荷、变地震载荷(波形、强度)下的风力机动力学响应进行研究。发现:地震横波对风力机结构响应造成剧烈影响,纵波相对于横波影响较小;风力机在水平方向的结构响应比竖向更剧烈,垂直方向的结构响应在结构分析时可忽略不计。叶片的结构响应主要由风载荷造成;因风载荷在来流方向的作用导致塔顶流向位移和塔架侧向弯矩受风载荷和地震载荷同时影响,塔顶侧向位移和塔架流向弯矩受地震载荷作用更显著。

The support structure composed of the pile foundation,tower and connecting components of a wind turbine is a mechanical structure that bears a large mass on top,and the impact of earthquakes on it is much greater than that on a conventional building.To address these issues,the dynamic response of wind turbines under variable wind and seismic loads(waveform and intensity)was investigated based on the NREL development computational platform,in conjunction with TurbSim,AeroDyn,FAST and Seismic.It is found that:the seismic transverse waves have a drastic effect on the structural response of the wind turbine,while the longitudinal waves have less effect compared to the transverse waves;the structural response of the wind turbine is more drastic in the horizontal direction than that in the vertical direction,while the structural response in the vertical direction is negligible in the structural analysis.The structural response of the blades is mainly caused by wind loads;due to the action of wind loads in the incoming direction,the tower top flow displacement and tower frame lateral bending moment are affected by both wind and seismic loads,and the tower top lateral displacement and tower frame flow bending moment are more significantly affected by seismic loads.