EEMD-based videogrammetry and vibration analysis method for rotating wind power blades.

• It is difficult to measure the dynamic status because of the wind turbine's far field working. A method for vibration analysis of wind turbine blades based on videogrammetry is proposed. • To obtain the space arc-like path coordinates of rotating blades, a videogrammetry experimental platform for rotating wind power blades was constructed. • The vibration information and modal frequency of wind turbine blades under operating conditions are calculated by extracting and analyzing the local periodic trajectory in a short time. • The vibration analysis of wind turbine blades based on videogrammetry method is compared with the calculation results of FEA and hammering experiment. The average error between the proposed method and the two methods is 4.355% and 4.63% respectively, within 5%. • This research can provide dynamic videogrammetry modal identification method and technical prototype for wind turbine blade condition monitoring and maintenance. It is difficult to measure the dynamic status because of the far fields working environment of the wind turbine. A method for vibration analysis of wind turbine blades based on videogrammetry is proposed. In order to obtain the space arc-like path coordinates of rotating blades, a videogrammetry experimental platform for rotating wind power blades was constructed. The space arc-like blade measuring points are collected and the error analysis is carried out by fitting the circular arc-like paths. The natural frequency of blade vibration is calculated based on Ensemble Empirical Mode Decomposition (EEMD) and fast Fourier transform (FFT). Evaluate the accuracy of the proposed method through finite element analysis (FEA) and hammering experiment. The results show that the modal & frequency from the presented method are basically consistent with the results of FEA and hammering experiment. It provides a theoretical method and technical means for measuring the dynamic vibration characteristics of blades. [ABSTRACT FROM AUTHOR]