摘要
用标准化相同二阶中心矩椭圆的长短轴比作为等离子射流形态的特征值,以反映射流温度、速度等相关工艺参数的变化,建立了等离子熔射成形过程在线可视化数据模型.实验中使用计算机视觉及图像处理技术研究了液相/粉末等离子熔射射流特征值与熔射能量相关工艺参数之间的关系.结果表明:随着熔射功率的增大,射流的特征值也增大,而液相熔射的特征值小于粉末熔射的特征值;随着Ar工作气体流量的增大,射流特征值并非增大而是减小.
The axial ratio of the ellipse with same normalized second-order central moments was takend as the eigenvalue of plasma spray jet morphologic characteristic.The method that reflects the jet temperature,velocity and related process parameters using the eigenvalue was developed.In the experiment,the computer vision and image processing technology was used to study the relationship between eigenvalues and the powder and the newly emerging liquid plasma spray process parameters.The result indicates that with the spraying power increases,the jet eigenvalues become greater.But the liquid spray jet eigenvalue was less than the powder spray.With the Ar gas flow rate increases,the jet eigenvalues don′t increase but decrease.Based on it,the relationship between jet eigenvalues and spray process energy parameters was found,which can provide firm basis for the forming quality online predict and control.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第1期54-57,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家高技术研究发展计划资助项目(2007AA04Z142)
国家自然科学基金资助项目(50474053)
关键词
液相/粉末等离子
熔射
射流
计算机视觉
图像处理
工艺参数
标准化相同二阶中心矩椭圆
特征值
powder/liquid plasma
spray
jet
computer vision
image processing
process parameters
the ellipse with same normalized second-order central moments
eigenvalues
