地震动方向对海上风力发电机动力响应的影响

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (5) : 193-201.

论文

席仁强1,2，杜修力1，许成顺1，许坤1

作者信息 +

Effects of ground motion input direction on dynamic response of offshore wind turbine

XI Renqiang1,2, DU Xiuli1, XU Chengshun1, XU Kun1

Author information +

文章历史 +

摘要

叶轮-塔架耦合及气动阻尼作用使得海上风力发电机前后向、侧向动力特性存在差别。针对NREL 5MW单桩式海上风力发电机，通过理论分析，探讨海上风力发电机前后向与侧向振型、阻尼特性的差异；然后，针对停机和运行两种工作状态，采用气动-伺服-水动-弹性完全耦合方法，分析输入地震动方向影响海上风力发电机结构动力响应的规律，探讨最不利方向；最后，还分析了平均风速对最不利输入地震动方向的影响。结果表明：输入地震动方向可能显著影响海上风力发电机支撑结构泥面弯矩和塔顶位移幅值；对于运行状态，强震作用下，侧向为最不利输入地震动方向，弱震作用下，前后向为最不利输入地震动方向。

Abstract

The rotor-tower coupling and aerodynamic damping lead to the distinction of dynamic characteristics between the fore-aft and side-to-side direction of offshore wind turbines. Taking the NREL 5MW monopile offshore wind turbines for example, the differences of vibration mode and damping characteristics between the fore-aft and side-to-side direction are analyzed through the theoretical analysis. Then, considering the running and parked operational conditions, the influence of input ground motion direction on the seismic response of offshore wind turbines is analyzed using the aero-servo-hydro-elastic fully coupled method to determine the most unfavorable direction. In addition, the influence of mean wind speed on the most unfavorable incident angles of earthquake waves is investigated. It is found that the amplitude of mudline bending moment and tower-top displacement of offshore wind turbines may be substantially affected by the direction of earthquakes. When the offshore wind turbine is running, the most unfavorable direction is the side-to-side direction under the excitation of strong ground motions, and it is the fore-aft direction as the earthquakes are weaker.

导出引用

席仁强1,2，杜修力1，许成顺1，许坤1. 地震动方向对海上风力发电机动力响应的影响[J]. 振动与冲击, 2021, 40(5): 193-201

XI Renqiang1,2, DU Xiuli1, XU Chengshun1, XU Kun1. Effects of ground motion input direction on dynamic response of offshore wind turbine[J]. Journal of Vibration and Shock, 2021, 40(5): 193-201

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