Research on the defect types judgment in wind turbine blades using ultrasonic NDT

Abstract

Beacuse of the complex internal structure of wind turbine blades, there are many types of defects. There will be important significance to determine the type of defects to assess the blade residual life and feedback on the design and production process. At present the type of defects found by ultrasonic nondestructive testing (NDT) can't be determined. Physical models of several typical defects are constructed. The sound intensity reflection coefficients of different physical models are calculated seperately, and the calculation method of the sound intensity reflection coefficient of actual defect is presented. Combined the calculated coefficients with the defect information tested, a method of recognize the type of defects is presented. Actual specimen testing is used to verify the effectiveness of the method.