The blade model is a three-dimensional surface structure that uses a close-range industrial photogrammetry system to measure the blade model. This paper firstly verifies the reliability of the system detection marker point algorithm, and then analyzes the accuracy of the close-range photogrammetry system by three factors: shooting distance, number of coding points and location of the camera station. Experiments show that the shooting distance has a great influence on the calculation accuracy, while the number of coding points and camera position have a little influence. Besides, we get a better data acquisition scheme through experiments, which solve the problem that the system accuracy is easily affected by the shooting conditions, and the system accuracy is further improved.
In this paper, an optical measurement method based on three-dimensional digital image correlation (3D-DIC) is described for load analysis of wind turbine blades. Author measured full-field strain and displacement fields of wind turbine blade model under different loads by the method and studied the deformation of the wind turbine blade model under different loads. In addition, the author evaluated the displacement accuracy of 3D-DIC method. Results show that 3D-DIC method can directly analyze the deformation of wind turbine blade model, and the displacement accuracy meets standards. At the same time, the results of load analysis will provide a theoretical basis for the load study of wind turbine blade in the future.