全尺寸叶片结构非线性对静载测试的影响

Effects of Structure Nonlinear on FullScale Wind Turbine Blade Static Test

摘要:

研究全尺寸叶片结构非线性对静载测试的影响，分析叶片应变、弯矩、刚度和挠度之间的关系，构建全尺寸叶片静载试验.通过三边法测试叶片的非线性变形及加载角度，在叶片截面上粘贴应变片监测局部应变.结果表明，与有限元目标值对比，在挥舞方向距离叶根4 m附近的刚度最大相差48%；在摆振方向距离叶根23 m至叶尖区域的刚度最大相差29%.通过实测结果修正有限元计算值，可为风机模型载荷计算提供精确刚度数据.

Abstract:

The effects of structure nonlinear on fullscale wind turbine blade static test were studied in this paper. First, the relationship between bending moment, strain, stiffness and deflection were theoretically analyzed. Then, fullscale blade was mounted on the test bench for extreme load static test. As the blade was deformed during the loading process, the loading angle, the radial, and tangential deflection of the blade were changed because of the blade structure nonlinear and torsional coupling. The loading force angle and arm were measured by using the triangular method. The strain gauges installed in the different section of the blade were used to measure the local strain on the blade. The results show that, compared with FEM target value, the maximum deviation of stiffness in 4 m away root during static test in flapwise direction is 48% and the maximum deviation of stiffness in 23 m away root in edgewise direction is 29%. The experimental results provide accurate stiffness data for numerical model of wind turbine to load calculations.