摘要
考虑水平轴风力机叶片和塔架的结构柔性,基于模态分析方法,建立了风力机叶片和塔架的耦合动力学模型来模拟整个系统的动态行为。应用线性加速方法,实现了结构动力响应的数值解法。利用分析模型对一台1.25MW风力机在稳态风作用下的结构动力响应进行了计算,计算结果显示所建立的模型能正确反映外部激励对结构变形及载荷的影响。此外,从计算结果可看出大型风力机的柔性结构在工作过程中变形很大;在进行载荷计算时考虑前二阶模态可得到较合理的计算结果。
Accounting for the flexibility of the blade and tower of the horizontal axis wind turbine, based on modal analys is method, the coupling dynamic equations of the blade and tower were obtained to simulate the dynamic behaviour of the complete system. Numerical solution of the dynamic equations was presented by applying the linear acceleration method. Adopting the proposed model, the dynamic responses of a 1.25MW wind turbine operating in steady wind were calculat- ed. The results indicate that the presented structure dynamic response analysis model can correctly reflect the effects of external excitements to the structure deformation and load. It can also be seen from the simulation results that the flexible structures of large-scale wind turbine undergo considerable deformation during operation, and reasonable load results can be obtained when taking into account the former two order modes.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2009年第6期804-809,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50706023)
广东省教育部产学研结合项目(2008B090500255)
广东省自然科学基金(06027186)
广东省科技计划项目(2007B010800034)
关键词
风力机
结构动力响应
模态分析
wind turbine
structure dynamic response
modal analysis
