Automatic Identification Technology of Near Surface Defects Based on Neural Network and Through Wave of Ultrasonic TOFD
摘 要
针对超声TOFD存在近表面盲区及近表面缺陷自动识别分类的问题,提出了基于超声TOFD直通波及神经网络对近表面孔状缺陷识别分类的方法。在近表面缺陷检测信号的直通波部分选取多个关键点,揭示了各关键点幅度分布与近表面缺陷深度的关系,获得了用于近表面缺陷检测的幅度分布特征值,并将该特征值用于BP神经网络对缺陷识别分类。试验结果表明,该方法能够对铝合金板近表面孔状缺陷进行准确、有效的自动识别分类。
Abstract
Aiming at the problem of near surface dead zones and defects automatic identification in ultrasonic TOFD technique, a automatic identification technology of near surface defects is proposed based on through wave of ultrasonic TOFD and neural network. Several key points in the part of through wave of testing signal are extracted and relationship between the amplitude distribution of key points and depth of near-surface defect is analyzed. The characteristic numbers of amplitude distribution which can be used to test near-surface defect are obtained. Moreover, the characteristic numbers can be used to defects recognition and classification in BP neural network. The experimental results showed that this technique can be used for accurate and effective classification and automatic identification.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目 国家自然科学基金资助项目(11104129);无损检测技术教育重点试验室开放基金资助项目(ZD201029001)
收稿日期 2013/7/18
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备注陈振华(1982-),男,讲师,博士,主要从事超声无损检测技术及其系统等方面的研究。
引用该论文: CHEN Zhen-hua,HU Huai-hui,LU Chao. Automatic Identification Technology of Near Surface Defects Based on Neural Network and Through Wave of Ultrasonic TOFD[J]. Nondestructive Testing, 2014, 36(3): 14~17
陈振华,胡怀辉,卢超. 基于超声TOFD直通波及神经网络的近表面缺陷自动识别[J]. 无损检测, 2014, 36(3): 14~17
被引情况:
【1】孟贵云,张世宏,陈振华,李新蕾,王宏, "超声TOFD检测声波在不锈钢焊缝中的传播特性及其应用",无损检测 37, 51-56(2015)
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【4】陈伟,詹红庆,杨贵德,等.基于直通波抑制的超声TOFD图像缺陷检测新方法[J].无损检测,2010,32(6):402-405.
【5】张锐,万明习,CAO W W.超声衍射—回波渡越时间方法焊缝裂纹原位定量无损估计[J] .机械工程学报,2000,36(5):54-57.
【6】陈天璐,阙沛文.基于超声衍射反射回波渡越时间的缺陷识别技术[J].化工自动化及仪表,2006, 33(4):50-52.
【7】陈涛,刘献礼,吉举正,等.基于BP神经网络的钢球表面缺陷识别[J].机械工程师,2010(7):81-82.
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