摘要
由于异型构件直径小、管壁薄与结构复杂等特点,增加了检测方法的难度。为此应用超声爬波检测原理,采用组合探头检测方法检测了异形构件内外壁的标准伤样。比较了缺陷回波与内棱波的区别,提出采用信号幅度与时间双特征量识别缺陷以消除内棱波的干扰。为了克服单探头数据信号片面性的缺点,采用了数据融合技术,综合三个探头的局部判伤结果来确定缺陷,提高了判伤的准确率。根据各探头信号的周期特征、持续时间与幅度特征三个特征量对缺陷做了综合评估。
The profded component has some features, such as thin wall, small diameter and complex structure, etc., which make it difficult to detect. According to the principle of ultrasonic creeping wave, the standard defects were detected on inner and outer of the profiled component by the composite probes testing method. Compared with the defect echo and inner-edge wave, it is suggested that the twin characteristic parameters of signal amplitude and time are used to eliminate the interference of inner--edge wave and de- tect the defect. For overcoming the disadvantage of single probe data, the local detection results of the three probes were synthesized by data fusion technology, so that the accuracy of defect detection is improved. The periodic feature, duration time and amplitude of each probe signal were used in omprehensive evaluation for the defect detection.
出处
《硬质合金》
CAS
北大核心
2010年第3期167-171,共5页
Cemented Carbides
关键词
超声检测
爬波
数据融合
ultrasonic testing
creeping wave
data fusion
