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Research on ultrasonic C-scan technique for large unsymmetric composite component

WANG Yan-ying~(1,2), WU Rui-ming~1, ZHOU Xiao-jun~1, CHENG Yao-dong~1 (1.College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310027, China; 2.Mechanical Engineering Department, Dalian University, Dalian 116622, China)  
In the ultrasonic C-scan of unsymmetric composite component, the probe is difficult to aim at the normal component direction and the ultrasonic attenuation is severe. To solve these problems, profile measurement and restructured modeling were used to track the surface of the component and realize the (realtime) sensitivity compensate. The initial curved surface model of skin was established using the preliminary ultrasonic data. Then, the point station for controlling probes move was calculated. The surface model of the component was reconstructed by the method of profile measurement and reverse engineering. The sensitivity compensate was realized through calculating the thickness of component at measuring point. Path of C-scan was programmed based on the restructured model and the principle of the smallest ultrasonic attenuation. Finally, the C-scan images of the unsymmetric composite component were received. It is shown that the precision and efficiency of ultrasonic detection can be increased by taking practical measures in the site.
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