Full-scale Testing And Structural Analysis Of Wind Turbine Blades

In recent years, Chinese wind energy industry develops rapidly, and the output of wind turbine generation and components increased considerably. However, the testing of these components, especially the wind turbine blades, has not been sufficient developed. In this paper, a full-scale wind turbine blade modal test has been carried out on the test bed constructed by Institute of thermal physics of Chinese Academy of Science. The blade tested in the paper has a rated power of 1.5MW and was 38m long. The method that exciting force measurement is not needed was chose. The mode was tested desperately in flat wise and edgewise direction. The collected time domain datum was then dealt with properly and modal parameters were abstracted. Modal criterions such as MAC MOV were then used to validate the results. Results show that the testing method adopted in this paper is suitable for this kind of turbine blades.According to distinguish structural characteristic of the chosen blades, several approximation was made and computational blade model was set up. FEA method was then used to simulate blade mode, and vibration identity was got. The comparison between experiment and numerical simulation show ed that the approximation before was reasonable, which significantly simplified the FEA model with acceptable sacrifice of precision. The time cost and hardware requirements of the simulation indicate FEA is a feasible method for blade design.