In this study, long-term vibration-based monitoring of a 900-kW onshore wind turbine is presented. Modal properties such as frequency, shape, and damping ratios were obtained using enhanced frequency domain decomposition method. Change in modal parameters due to environmental and operational conditions was determined. Modal parameters after cleansing such effects were obtained by multiple linear regression analyses. Then, finite element model of the wind turbine was developed including piles and soil springs; and updated using identified modal parameters. After all, seismic fragility curves of the structure with the limit state being local buckling were developed considering different levels of wind speed. Stress level at which local buckling occurs was determined by pushover analysis of the turbine using a nonlinear finite element model. In the context of this study, it was observed that identified modal values had significant scattering and level of wind speed significantly changed the seismic fragility curve of the wind turbine.

在这项研究中，提出了基于振动的900 kW陆上风力涡轮机的长期监测。使用增强的频域分解方法获得了诸如频率，形状和阻尼比之类的模态特性。确定了由于环境和操作条件导致的模态参数的变化。清洗后的模态参数通过多重线性回归分析获得。然后，建立了包括桩和土弹簧的风力发电机的有限元模型。并使用已识别的模态参数进行更新。毕竟，考虑到不同的风速水平，得出了极限状态为局部屈曲的结构的地震脆性曲线。通过使用非线性有限元模型对涡轮进行推覆分析来确定发生局部屈曲的应力水平。