Along-wind response of a wind turbine tower with blade coupling subjected to rotationally sampled wind loading
Along-wind response of a wind turbine tower with blade coupling subjected to rotationally sampled wind loading
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DOI：
10.1016/j.engstruct.2005.03.004
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发表时间：
2005-07
影响因子：
5.5
通讯作者：
P. Murtagh;B. Basu;B. Broderick
中科院分区：
文献类型：
--
作者：
P. Murtagh;B. Basu;B. Broderick
本文提出了一种研究风力涡轮机塔架和旋转叶片组件在旋转采样的固定风载荷作用下的顺风强迫振动响应的方法。风力发电机组由三个旋转的转子叶片组成，它们连接到柔性环形塔架的顶部，构成多体动态实体。塔架和旋转叶片均被建模为离散多自由度 (MDOF) 实体，从而允许使用离散参数方法获得每个实体的自由振动特性。塔架的自由振动特性包括顶部刚性质量（代表机舱）的影响，而叶片的自由振动特性包括由于旋转和叶片重力载荷导致的离心刚化的影响。叶片由从旋转采样的风湍流谱的离散傅里叶变换 (DFT) 表示得出的阻力时程激励。使用模式加速方法获得叶片响应时程，该方法允许量化由于三个叶片的扑动而产生的基础剪切力。由此产生的底部剪切力传递到塔的顶部。还考虑了塔上的风阻载荷，并使用风力谱的 DFT 导出了一系列空间相关的节点力时程。然后，通过组合塔架/机舱的运动方程并在频域中的兼容性条件下求解塔架顶部的位移，将塔架/机舱与旋转叶片耦合。频域响应的傅里叶逆变换产生耦合系统的响应时程。还研究了不考虑叶片/塔架相互作用的等效系统的响应，并对结果进行了比较。
This paper proposes an approach to investigate the along-wind forced vibration response of a wind turbine tower and rotating blades assembly subjected to rotationally sampled stationary wind loading. The wind turbine assembly consists of three rotating rotor blades connected to the top of a flexible annular tower, constituting a multi-body dynamic entity. The tower and rotating blades are each modelled as discretized multi-degree-of-freedom (MDOF) entities, allowing the free vibration characteristics of each to be obtained using a discrete parameter approach. The free vibration properties of the tower include the effect of a rigid mass at the top, representing the nacelle, and those of the blade include the effects of centrifugal stiffening due to rotation and blade gravity loadings. The blades are excited by drag force time-histories derived from discrete Fourier transform (DFT) representations of rotationally sampled wind turbulence spectra. Blade response time-histories are obtained using the mode acceleration method, which allows for the quantification of base shear forces due to flapping for the three blades to be obtained. This resultant base shear is imparted into the top of the tower. Wind drag loading on the tower is also considered, with a series of spatially correlated nodal force time-histories being derived using DFTs of wind force spectra. The tower/nacelle is then coupled with the rotating blades by combining their equations of motion and solving for the displacement at the top of the tower under compatibility conditions in the frequency domain. An inverse Fourier transform of the frequency domain response yields the response time-history of the coupled system. The response of an equivalent system that does not consider the blade/tower interaction is also investigated, and the results are compared.