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Finite element analysis of damage identification of wind turbine blades based on dynamic characteristics

SU Tian;XUE Gang;LIU Shu-zhi;Architecture and Civil Engineering School,Inner Mongolia University of Science and Technology;  
During running process of the wind turbine,it is not easy to directly observe blade damages caused by environmental erosion.By the ANSYS Workbench,finite element identification analysis on blades of a 15 KW wind turbine was carried out,which were damaged at different positions and to different degrees. It is shown in the analytic results that variations in natural vibration frequency of a blade could be used to determine whether it was damaged as well as the damage degree,but the damage position could not be positioned by it; damage degrees and positions could be identified according to displacement modal variations and strain modal variations of the blades.
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