风电叶片全尺寸静力测试的形变分析

Deformation analysis of full scale static test for wind turbine blades

针对风电叶片静力测试过程中叶片大挠度变形和叶根连接法兰变形对截面弯矩与形变测量精度的影响,本文分别基于柔度法和逐段刚化法得到叶片挠度以及变形后叶片承受弯矩的计算公式,进一步修正法兰变形带来的影响,并建立风电叶片多点静力加载的仿真模型,对比理论计算结果和有限元仿真数据。结果表明设计加载方案时考虑大挠度变形,可以降低靠近叶根区域截面的弯矩误差至1.07%;修正法兰变形带来的叶片挠度后,5.7 m处叶片挠度计算误差减小0.1%,从而可以确保全尺寸叶片静力加载的测试精度。

In view of the influence of large deflection and root connecting flange deformation on the bending moment and measuring accuracy of deformation during the static testing of wind turbine blade,calculation formulas of blade deflection and bending moment after deformation are obtained based on the flexibility method and the piecewise rigidization method respectively.Moreover,the influence brought by flange deformation is modified and the simulation model of wind turbine blade under multi-point static loading is established.Then,the theoretical calculation results are compared with the FEM analysis data.The results show that the bending moment error of the section near the blade root can be reduced to 1.07%considering large deflection when designing the loading scheme.After correcting the blade deflection caused by flange deformation,the calculation error of blade deflection at 5.7mis reduced by 0.1%,so as to ensure the test accuracy of full-size blade under static loading.