ICT辅助涡轮叶片内冷通道多余物检测方法  

ICT assisted detection for remainders in the internal cooling channel of the turbine blade

作　　者：杨民[1] 孙晶晶[1] 李兴东[2] 魏东波[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191 [2]中国计量科学研究院电离辐射与医学工程计量科学研究所,北京100013

出　　处：《航空动力学报》2011年第11期2433-2438,共6页Journal of Aerospace Power

基　　金：国家自然科学基金(60872080;61077011);国家科技支撑项目(2011BAI02B02)

摘　　要：为了实现涡轮叶片内冷通道多余物的无损检测与高精度提取,以工业计算机断层扫描技术为检测手段,基于刚性变换与正弦投影之间的关系,求得待测试件与标准试件断层图像方位上的位移参数,对测试件断层正弦图与标准件对应断层正弦图进行配准,提取出多余物正弦图并重建出多余物断层图像.实验证明该方法能有效识别出叶片内冷通道内的多余物,相比传统的基于CT(computed tomography)图像的多余物提取算法,该算法在投影域内进行,不受投影数据不完全、扫描系统偏差以及重建伪影的影响,具有更高的准确性.In order to detect remainders in the internal cooling channels by non-destruc- tive means with high accuracy, industrial computed tomography was used to scan the tested blade. The position displacement parameters between the tested blade and the standard specimen were calculated base on the rigid transformation and sinogram projection. Then the sinograms of the scanned slice and the corresponding standard slice were matched together in order to extract the sinogram of the remainders and the reconstructed images of them were obtained. The experimental results prove that this method can extract remainders in the internal cooling channels effectively. Compared to the traditional remainder extraction algorithm based on CT （computed tomography） image, the proposed algorithm is realized in the projection domain, and it is rarely affected by projection data incompleteness, scanning system bias and the reconstruction artifacts, so it has a higher accuracy.

关 键 词：多余物 工业计算机断层扫描(ICT) 涡轮叶片 图像配准 X-射线检测 

分 类 号：V233[航空宇航科学与技术—航空宇航推进理论与工程]