摘要
针对非对称复合材料构件在进行超声C扫描检测时存在探头对准法线方向困难、超声波衰减大的问题,采用仿形测量和重建模型的方法实现对构件曲面的跟踪和灵敏度的实时补偿.利用超声探头采集的初始数据建立外蒙皮的初始曲面模型,计算出控制超声探头运动的点位信息.采用仿形测量方法和反求技术重建构件的外蒙皮曲面模型,利用重建模型计算构件上各个测点处的厚度,实现灵敏度补偿.根据重建模型和超声波衰减最小原则,规划超声C扫描检测时的路径,最后得到构件的超声C扫描检测图像.实验结果表明,该技术可以明显提高大型非对称复合材料构件超声检测的精度和效率.
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 real-time 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.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2004年第9期1208-1211,1234,共5页
Journal of Zhejiang University：Engineering Science
关键词
非对称复合材料
超声C扫描
仿形测量
曲面重建
无损探伤
Contour measurement
Error compensation
Image reconstruction
Reverse engineering
Ultrasonic devices
