关键词: 动力机械工程 , 裂纹提取 , 差分图像 , 活塞 , 热冲击 , 图像测量 , 内燃机

Abstract: At present, thermal crack is checked manually and the thermal damage procedure is hard to get, though an automatic test technique is employed in thermal shock test. A thermal shock bench was improved by incorporating an image measure system to get thermal crack information where the pic?tures of piston crown were taken by a CCD camera periodically during the test. An effective image dif?ferential algorithm is studied to extract thermal crack finally which can effectively resist effection of il?lumination variation. Image correlation based on dynamic image difference is a practical method in ex?tracting dynamic thermal crack at the thermal shock test bench.

Key words: power mechanical engineering , extracting thermal crack , differential image , piston , ther?mal shock , image measure , ICE