Damage Identification Research Of Wind Turbine Blade Based On The Power Spectrum

As the increasement of the pressure about the requirements of the energy and environment,all countries in the world have to strengthen the development of new energy.Wind power as a source of clean energy,plays a very important role in preventing the air pollution and decreasing emissions.Wind driven generator system is a commonly used device.In the process of the capture of the wind,the wind turbine blades are the key parts of wind driven generator system.When wind turbine blade occur to damage during the operation,the structure characteristics of wind driven generator system will drop.Especially when the wind driven generator system collapses,it caused serious economic losses and safety hazards.The damage identification research about the wind turbine blades is of great significance for the research of domestic and foreign scholars.Based on the modal analysis(frequency and vibration mode),in this paper,a kind of damage identification method based on the fluctuating wind power spectrum of the acceleration response has been introduced which can identify the wind turbine blades damage.We can get the changes of wind power spectrum of the acceleration response of the wind turbine blade damage based on the theory of Davenport wind velocity spectrum,when it loads to the power spectral density of Davenport to the wind turbine blades.This paper study of the wind-power blades based on the numerical simulation and structural dynamic test,before and after the wind turbine blade damage.According to the maximum changes of the power spectrum of the acceleration,we can judge whether the wind turbine blade damage happened,and locate the position of the wind turbine blade.For the wind blade typical example of the crack damage,this paper further puts forward a new method about structure damage degree evaluation—the acceleration response power spectral sensitivity matrix.By means of different damage types and degrees of the wind turbine blades,using of the dynamic response sensitivity matrix,we can accurately get qualitative,positioning and quantitative about the structure damage.