摘要
模拟、自动试验技术在活塞热冲击可靠性的研究上已得到充分应用,但热裂纹的观测仍然依靠人工进行,因而不能及时、准确地获取裂纹扩展情况。通过在现有的试验台架上安装图像监控系统,采用基于联合灰度级分布的动态图像差分法,有效避免了光照的影响,得到热冲击过程中裂纹的扩展信息,为热损伤的量化分析提供了方法。
At present, the thermal crack is checked manually and the thermal damage procedure get, though the automatic testing technique has been employed in the thermal shock test. In this study, a thermal shock bench was improved to incorporate image measure system to get thermal crack information where pictures of piston were taken by a CCD camera periodically during the test. An effective image subtraction algorithm was studied for extracting thermal crack from the pictures regardless of variable illumination intensity.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2006年第3期58-61,共4页
Chinese Internal Combustion Engine Engineering
关键词
内燃机
裂纹扩展
差分图像
活塞
热冲击
图像测量
I. C. Engine
Crack Growth
Subtraction Image
Piston
Thermal Shock
Image Measure