基于分形理论的摩擦焊超声检测缺陷信号识别  

The blemish identify in ultrasonic testing of friction welded joints based on fractal theory

作　　者：尹欣[1] 樊成芳[2] 

机构地区：[1]郑州航空工业管理学院机电工程系,郑州450015 [2]西北工业大学机电学院 郑州,西安710072

出　　处：《机械设计与制造》2008年第2期44-46,共3页Machinery Design & Manufacture

摘　　要：采用超声波探伤仪U1traPAC系统对GH4169高温合金摩擦焊件进行检测,针对缺陷信号特点,提出基于分形理论的摩擦焊超声检测缺陷信号的识别方法。运用一种新的分形维数计算方法-归一化尺度计盒维数法对试件超声回波缺陷信号盒维数进行计算,统计分析出三种缺陷信号盒维数范围,并对结果进行方差分析。分析结果表明,有缺陷信号与无缺陷信号有着各自分形维数区间,且不交叠,据此可用来判断缺陷的有无。该方法对摩擦焊件缺陷信号的分类识别有较好的统计特性。The friction welded joints made by GH4169 heat metal alloys are detected by U1traPAC system of the ultrasonic wave explore instrument. Aimed at the blemish signal characteristics , a method is put forward to identify the blemish signal in ultrasonic testing of friction welded joints based on fractal theory., A new kind of fractal dimension number calculation method-normalized scale box- counting dimension method is used to calculate the box-dimension of the blemish signal, and statistic and analysis the sco...

关 键 词：分形理论 盒维数 摩擦焊 超声检测 

分 类 号：TG441.7[金属学及工艺—焊接]