基于几何精确梁理论的风力机叶片单元  

BEAM FINITE ELEMENT FOR WIND TURBINE BLADE BASED ON GEOMETRICALLY EXACT BEAM THEORY

作　　者：吕品[1] 廖明夫[1] 徐阳 尹尧杰 

机构地区：[1]西北工业大学旋转机械与风能装置测控研究所,西安710072 [2]连云港中复连众复合材料集团有限公司,连云港222006

出　　处：《太阳能学报》2015年第10期2422-2428,共7页Acta Energiae Solaris Sinica

摘　　要：为研究大变形带来的非线性特性,基于几何精确梁理论建立一种用于叶片的非线性单元。该叶片单元考虑了材料非线性以及截面偏心的影响。采用Gauss-Lobatto积分和微分求积法离散积分形式的平衡方程,并推导出增量线性方程。用3个标准算例验证单元的正确性。最后,该叶片单元被应用于10 MW风力机的叶片和整机模态分析,准确地获得风力机系统的固有频率和振型。With the development of the wind energy, wind turbine blades are getting larger and more flexible, which makes the nonlinear dynamic behavior of wind turbine unfold more clear. Nonlinear effect is a relatively new focus area in the wind turbine territory. In order to study nonlinear performance caused by large deformation, the nonlinear unit of blade was built based on geometrically exact beam theory. The effect of nonlinear material and eccentric cross-section on the blade unit was considered. The integration equation of motion was discretized by using Gauss-Lobatto quadrature formula and differential quadrature method, and incremental linear equation was derived. The correctness of unit was verified by three standard examples. Further, the blade unit was used as the blade of 10 MW wind turbine and mode analysis. The natural frequency and vibration shape of wind turbine system was obtained correctly.

关 键 词：风力发电 风力机叶片 大变形 几何非线性 模态分析 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]