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为研究风力机在湍流风与地震联合作用下的动力学特性,本文基于开源软件FAST和Wolf理论建立风力机地震动力学仿真模型.通过考虑正常运行、一直停机和地震诱导停机三种不同的运行方式,以及150种不同强度地震运动,从而分析气动阻尼及地震强度对结构响应的影响。结果表明:塔顶位移在低强度地震工况受气动阻尼影响较大,此时结构变形量是造成塔顶位移发生变化的主要原因。塔顶振动加速度最大值及塔顶最大位移与设计地震加速度峰值之间均为明显的线性关系,且与系统地震响应系数成正比。基于地震响应系数提出了一种非线性的地震载荷预估模型,通过与相关认证机构提出的标准比较,发现本文提出的模型预估精度更高,可更精确地反映地震强度与风力机结构动力学响应之间的关系。本文结果可为相关标准的完善提供较高的参考价值。
In order to study the dynamic characteristics of wind turbine under the combined action of turbulent winds and earthquakes, this paper builds a simulation model of wind turbine seismic dynamics based on the open source software FAST and Wolf theory.Through considering the normal operation, has been shut down and earthquake-induced shutdown three different operations Method and 150 kinds of earthquake with different intensities to analyze the influence of aerodynamic damping and seismic intensity on the structural response. The results show that the displacement of the tower is greatly affected by the aerodynamic damping in low-intensity seismic conditions, and the structural deformation is the main cause of the displacement of the tower at this time. The maximum vibration acceleration at the top of the tower and the maximum displacement at the top of the tower and the peak value of the design earthquake acceleration are obviously linear and proportional to the seismic response coefficient of the system. Based on the seismic response coefficient, a nonlinear seismic load prediction model is proposed. Compared with the standards proposed by the relevant certification bodies, the model proposed in this paper has higher prediction accuracy, which can more accurately reflect the seismic strength and wind turbine structural dynamics The relationship between learning response. The results of this paper can provide a higher reference value for the improvement of relevant standards.