论文部分内容阅读
基于模态分析法,通过二节点悬臂梁单元对柔性叶片进行离散化分析,得到水平轴风力机柔性叶片在挥舞、摆振和扭转方向上的固有特性;利用Newmark常平均加速度法和振型解耦实现各阶的振型结构动力响应分析。以某5MW大型风力机为例,分析高阶特征模态对叶片动态响应的影响,同时考虑截面扭角变化前后对气动弹性载荷的反馈作用。结果表明,大型风力机柔性叶片在旋转过程中的振动和变形相当大,截面扭转变化对风力机的气动弹性问题有较大影响。
Based on the modal analysis method, the discretization of the flexible blades by the two-node cantilever beam element is obtained, and the inherent characteristics of the flexible blades in the horizontal axis wind turbine in wielding, shimming and torsional direction are obtained. By using Newmark’s method of normal average acceleration and mode shape Coupling to Realize Dynamic Response Analysis of Vibrating Structure with Various Stages. Taking a 5 MW large wind turbine as an example, the influence of high order modes on the dynamic response of the blade is analyzed, and the feedback effect on the dynamic aerodynamic load before and after the change of cross section twist angle is considered. The results show that the vibration and deformation of flexible blades of large wind turbine during rotation are quite large, and the change of cross-section torsion has great influence on the aeroelasticity of wind turbine.